Showing papers in "Soil Science in 1982"
319 citations
TL;DR: In this paper, a new infiltration equation is obtained by introducing a new parameter, in addition to the usual sorptivity and conductivity at saturation, which can be related to the conductivity of the soil.
Abstract: A new infiltration equation is obtained by introducing a new parameter, in addition to the usual sorptivity and conductivity at saturation. This third parameter can be related to the conductivity of the soil. In particular, if this parameter is equal to zero, then the infiltration equation r
239 citations
TL;DR: Using data from 91 Arizona soils, this paper calculated the accumulations of organic- and carbonate-carbon in different soil orders and ecosystem types, relative to precipitation, elevation, and parent material.
Abstract: Using data from 91 Arizona soils, I calculated the accumulations of organic- and carbonate-carbon in different soil orders and ecosystem types Regional accumulations were examined relative to precipitation, elevation, and parent material The largest accumulations of pedogenic carbonates were found in Aridisols and in areas of desert scrub vegetation, where carbonate-carbon exceeded organic carbon by a factor of > 10 In soils under woodland vegetation, organic carbon accumulations predominated According to the Arizona data, I estimate that more than 800 X 1015 grams of carbon are stored in the caliche layers of the world's Aridisols and arid Entisols
209 citations
TL;DR: In this article, the authors show that root penetration in such subsoils is limited by lack of calcium, rather than by aluminum toxicity, is supported by simple and inexpensive tests showing that the addition of 0.10 to 0.15 meq/100 g calcium as chloride, phosphate, or carbonate effectively normalized seedling root growth, which, in the absence of such additions, stopped within a few days.
Abstract: The restriction of crop root growth in Cerrado (savanna) Oxisols often reduces yields because the volume of soil explored by the roots is insufficient to supply enough water during dry periods that occur in the rainy season. A recent soil survey of the 580 000 hectares of the Federal District in Central Brazil shows a number of profiles that have clayey B21 horizons within 50 centimeters of the surface with very low levels of exchangeable calcium + magnesium (0.2 milliequivalents per 100 grams or less) and no exchangeable aluminum. The hypothesis that root penetration in such subsoils is limited by lack of calcium, rather than by aluminum toxicity, is supported by the results of simple and inexpensive tests showing that the addition of 0.10 to 0.15 meq/100 g calcium as chloride, phosphate, or carbonate effectively normalized seedling root growth, which, in the absence of such additions, stopped within a few days. The addition of magnesium carbonate, however, did not improve root growth. To test whether the leaching of calcium salts might ameliorate the calcium deficiency in the subsoil, samples were taken from an experiment that had received about 2500 kg/ha calcium as limestone and ordinary superphosphate at installation 2 years previous. Compared with root growth in samples from adjacent virgin soil, these soils showed improved root growth to as deep as 75 cm, thus suggesting that fertilizer management can have a beneficial effect on subsoil rooting in such soils.
153 citations
TL;DR: The relative mobility of Cd, Cu, Ni, and Zn added to several soils and the simultaneous desorption and leaching of metals (Ca, Mg, K, Al, Na, heavy metals) were determined by eluting soil columns with 0.01 M CaCl/sub 2/ and analyzing the metals in leachates and soil by plasma emission spectroscopy as mentioned in this paper.
Abstract: The relative mobility of Cd, Cu, Ni, and Zn added to several soils and the simultaneous desorption and leaching of metals (Ca, Mg, K, Al, Na, heavy metals) were determined by eluting soil columns with 0.01 M CaCl/sub 2/ and analyzing the metals in leachates and soil by plasma emission spectroscopy. Although soil chemical properties generally had a larger effect on the mobility of metals than did the properties of the metals themselves, Cu moved least readily through all soil columns. The least mobility of metals was observed in a mineral soil with a relatively high pH, CEC, and exchangeable base content. The liming of an acid mineral soil reduced metal mobility, but not to the extent expected from the very low mobility observed for a naturally nonacid mineral soil. The order of mobility of the metals in the soils was: Cu<
150 citations
141 citations
TL;DR: In this paper, an analytical technique that included solvent extraction, anion-exchange chromatography, and final determination of As by flameless atomic absorption spectrophotometry (FAA) was successfully applied to typical As-polluted soils in Japan.
Abstract: To determine the amounts of arsenic compounds, such as arsenate, arsenite, monomethylarsonate (MMA), and dimethylarsinate (DMA) in soils, we developed an analytical technique that included solvent extraction, anion-exchange chromatography, and final determination of As by flameless atomic absorption spectrophotometry (FAA). This technique was successfully applied to typical As-polluted soils in Japan. As a result, arsenate was found to be the major component, and lower levels of DMA and MMA were also detected in most of the samples. (DMA: 4 to 69 ppb in paddy soils, 2 to 7 ppb in upland or orchard soils; MMA: 5 to 88 ppb in paddy soils, undetectable to 7 ppb in upland or orchard soils). In addition, two kinds of new As compounds (X1 and X2) were found and identified by field desorption-mass spectrometry. Seasonal variations of As compounds were also investigated in a rice field in Terayogai, Motoyoshi-town, Miyagi Prefecture. Consequently, the pH and the amounts of arsenite and DMA increased with the reduction of soil under flooded conditions, whereas the pH decreased and the amounts of arsenate and MMA increased under upland conditions.
123 citations
TL;DR: This paper evaluated the effect of introducing other functional groups to phenol on adsorption by soil and developed equilibrium adaption isotherms for phenol, catechol, resorcinol, and the ortho, meta, and para isomers of cresol, methoxyphenol, nitrophenol and chlorophenol.
Abstract: I evaluated the effect of introducing other functional groups to phenol on adsorption by soil and developed equilibrium adsorption isotherms for phenol, catechol, resorcinol, and the ortho, meta, and para isomers of cresol, methoxyphenol, nitrophenol, and chlorophenol. Introducing —CH3, —OCH
104 citations
TL;DR: In this article, chemical and clay mineralogical studies on Ando soils, Brown forest soils, and Podzolic soils that had been formed mainly from felsic Towada-a (1000 B.P.) and Chuseri (4000 B.) ashes under different climates and vegetation were conducted.
Abstract: We conducted chemical and clay mineralogical studies on Ando soils, Brown forest soils, and Podzolic soils that had been formed mainly from felsic Towada-a (1000 B.P.) and Chuseri (4000 B.P.) ashes under different climates and vegetation. Organic carbon accumulated remarkably in the humus horizons of all the soils and contributed to the high CEC of the soils. Soil acidity was observed to be in the order of Ando soils < Brown forest soils < Podzolic soils, reflecting the differences in base saturation and clay mineralogy of these soils, and to have a tendency to decrease with depth within the same profiles. Diagnostic properties of soil samples, such as pH(NaF), phosphate absorption, pyrophosphate-soluble Fe(Fep)/dithionite-citrate-soluble Fe(Fed), pyrophosphate-soluble Al(Alp)/dithionite-citrate-soluble Al(Ald), Fep + Alp/percent clay, Fep + Alp/Fed + Ald, etc., were studied in detail. None of these chemical criteria, however, could distinguish satisfactorily among Ando soils, Brown forest soils, and Podzolic soils formed from Towada ashes. It was noted that both Fep/Fed and Alp/Ald ratios increase with decrease in the soil pH(H2O). Notable differences in clay mineralogy were observed between soil groups. Ando soils had mostly clay fractions dominated by amorphous materials consisting mainly of allophane and imogolite. Nonexpansible chloritized 2:1 mineral, which was major among the crystalline clay minerals, was present in relatively large amounts only in the surface horizons. Brown forest soils showed a diversity in clay mineralogy within the same soil profiles. The clay fractions of the surface soils showed an abundance of chloritized 2:1 mineral with high expansibility and an absence of allophane and imogolite. The subsoils showed major amorphous and paracrystalline materials with minor 2:1 layer silicates. The clay fractions of the Podzolic soils, except those of IIB horizon soils, were characterized by the abundance of chloritized 2:1 mineral varying widely in expansibility and by the absence of allophane and imogolite. The IIB horizons from Chuseri ash had clay fractions dominated by amorphous materials consisting mainly of free iron and alumina. Laminar opaline silica was found in almost all the humus horizons and was relatively abundant in the modern humus horizons of Brown forest soils. We concluded that formation of allophane and imogolite, as well as chloritization of 2:1 layer silicates, is related primarily to soil acidity. Allophane and imogolite formed only in the soils having pH(H2O) >4.9, irrespective of differences in soil groups and soil horizons. The 2:1 layer silicates were considered to have formed largely by alteration of volcanic glass. Chloritization of 2:1 layer silicates was observed to proceed with formation of allophane and imogolite. The formation of laminar opaline silica in the surface soil was considered to be suppressed not only in the Ando soils containing large amounts of allophane and imogolite, but also in the Podzolic soils, which are subject to strong leaching.
94 citations
TL;DR: The authors showed that nonspherical aggregates (cubes) can be represented by equivalent spherical aggregates; the radius of the equivalent sphere was chosen such that the sphere volume was the same as that of the cube.
Abstract: We measured diffusion of bromide or 36C1− from cubic and spherical aggregates. These experiments were done with single and mixed sizes of aggreagtes in order to assess (1) whether or not solute diffusion from nonspherical aggregates could be approximated by diffusion in equivalent spheres, and (2) if a mixture of aggregate sizes could be represented by a single weighted-average size. We showed that nonspherical aggregates (cubes) can be represented by equivalent spherical aggregates; the radius of the equivalent sphere was chosen such that the sphere volume was the same as that of the cube. Mixed sizes of spherical or nonspherical aggregates could be represented by a single spherical aggregate whose radius was computed on a volume-weighted basis. This report discusses application of these findings in describing solute transport in aggregated soils.
We measured diffusion of bromide or 36C1− from cubic and spherical aggregates. These experiments were done with single and mixed sizes of aggreagtes in order to assess (1) whether or not solute diffusion from nonspherical aggregates could be approximated by diffusion in equivalent spheres, and (2) if a mixture of aggregate sizes could be represented by a single weighted-average size. We showed that nonspherical aggregates (cubes) can be represented by equivalent spherical aggregates; the radius of the equivalent sphere was chosen such that the sphere volume was the same as that of the cube. Mixed sizes of spherical or nonspherical aggregates could be represented by a single spherical aggregate whose radius was computed on a volume-weighted basis. This report discusses application of these findings in describing solute transport in aggregated soils.
TL;DR: In this paper, the shape, size, and degree of aggregation of fulvic and humic acid particles deposited on mica by the rapid freezing and drying of dilute aqueous solutions were determined.
Abstract: We used a replica technique, in conjunction with transmission electron microscopy, to determine the shape, size, and degree of aggregation of fulvic and humic acid particles deposited on mica by the rapid freezing and drying of dilute aqueous solutions. Five major types of structures, common to both fulvic and humic acid preparations, were observed: small discrete spheroids (9 to 50 nm in diameter); flattened aggregates of spheroids (100 to 200 nm in diameter); linear, chainlike assemblies of these larger aggregates; flattened filaments (15 to 150 nm in width); and perforated sheetlike structures. Transitional stages were noted between these various structural conformations. The concentration of the humic substance in solution at the time of freezing and drying determined the type of structure that predominated in the deposits. Varying the pH (3.5, 7.0, 10.0) of the original solutions had no effect on the type of structures observed. The techniques introduced overcome many of the difficulties inherent in the preparation of humic substances for transmission electron microscopy and have potential use in the study of metal- and clay-complexing of these materials.
TL;DR: In this article, the authors report that simple laboratory experiments have shown that the standard method does not include nitrate and nitrite, but that a simple modification, involving the use of Devarda's alloy, allows inclusion of nitrate, which is desirable if the method is used for assessing available nitrogen in tropical upland soils that experience pronounced wet and dry seasons.
Abstract: The alkaline permanganate digestion method has been widely used for assessing the available nitrogen pool in soils. We report that simple laboratory experiments have shown that the standard method does not include nitrate and nitrite, but that a simple modification, involving the use of Devarda's alloy, allows inclusion of nitrate and nitrite. This modification is desirable if the method is to be used for assessing available nitrogen in tropical upland soils that experience pronounced wet and dry seasons. Results with soil on our experimental farm showed that the nitrate content of the soil contributed 10 to 40 percent of the available nitrogen assessed by the modified method.
TL;DR: In this article, a water-soluble fulvic acid-copper-iron complex was characterized by chemical, spectroscopic (infrared, electron spin resonance and Mössbauer), x-ray, and thermal (differential thermal analysis) methods.
Abstract: We prepared water-soluble fulvic acid-copper and fulvic acid-iron complexes, with fulvic acid:metal ratios of 1:0.5 and 1:1, at pHs 4 and 6. After the complexes were freezedried, we characterized them by chemical, spectroscopic (infrared, electron spin resonance, and Mössbauer), x-ray, and thermal (differential thermal analysis) methods. The major FA functional groups involved with metal complexing were COOH and phenolic OH groups. Electron spin resonance (ESR) data showed that substantial portions of the metals in the complexes formed inner sphere complexes with the FA. The Cu in all complexes was divalent, whereas the Fe was trivalent. From x-ray diffraction patterns, it appeared that metals brought FA “molecules” closer together by bridging adjacent FA “molecules.” The thermal stability of FA decreased as it complexed with metals. Apparently, the complexing of Cu and Fe exerted strains on the structure of the FA, thereby lowering its resistance to thermal decomposition. The data presented here provide evidence that at least portions of the Cu and Fe are strongly complexed by the FA.
TL;DR: In this paper, a method for fractionation of soil zinc in wetland rice soils is presented, which distinguishes four zinc fractions: zinc in soluble organic complexes and exchange positions; zinc in amorphous iron and aluminum oxides; and zinc in crystalline oxides of iron and alumi.
Abstract: We present a method for fractionation of soil zinc in wetland rice soils. The fractionation scheme distinguishes four zinc fractions: (1) zinc in soluble organic complexes and exchange positions; (2) zinc in amorphous iron and aluminum oxides; (3) zinc in crystalline oxides of iron and alumi
TL;DR: In this article, the authors investigated the effects of three factors on the decomposition of sewage sludge in soil: sludge's content of toxic metals, microbial population, and facility with which the sludge decomposition is carried out.
Abstract: Decomposition of sewage sludge in soil is mediated by microbial populations. The facility with which the decomposition is carried out is influenced by several factors, one being the sludge's content of toxic metals. The objectives of this investigation were to determine the effects of three
TL;DR: In this article, the relationship between the buffer power and the critical K+ concentration of the soil solution in pot experiments with Italian ryegrass was studied, and a very close correlation (r2 = 0.908) was found between the K+, buffer power, and the soil concentration.
Abstract: We studied the relationship between the K+ buffer power and the critical K+ concentration of the soil solution in pot experiments with Italian ryegrass. Critical K+ concentration is defined as that K+ concentration of the bulk soil solution below which plants respond by a yield increase when K fertilizer is applied. The K+ concentration of the soil solution was measured indirectly by means of the electro-ultrafiltration technique. The K+ buffer power was obtained by plotting the exchangeable K+ against the K+ concentration of the bulk soil solution. The steepness of the resultingcurve reflects the K+ buffer power. Nine soils differing widely in clay content, CEC, and K+ buffer power were used for the investigation. A very close correlation (r2 = 0.908) was found between the K+ buffer power and the critical K+ concentration of the soil solution. This relationship was reflected by a hyperbola (y = c/x), indicating that the critical K+ concentration was lower the higher the K+ buffer power was.
TL;DR: In this article, a study was conducted to characterize the extractability and solubility of phosphate in soils amended with anaerobically digested sewage sludges that resulted from treatment of sewage with Ca(OH)2, Al2(SO4)3, or FeCl3.
Abstract: This study was conducted to characterize the extractability and solubility of phosphate in soils amended with anaerobically digested sewage sludges that resulted from treatment of sewage with Ca(OH)2, Al2(SO4)3, or FeCl3. The sludges were applied annually to field plots situated on a loamy sand (pH 7.3) and a loam (pH 7.4) and cropped to corn (Zea mays L.) or bromegrass (Bromus inermiss Leyess) for 7 years. Extractability of soil P by NaHCO3 was in the order Ca-sludge ≫ Fe-sludge ≥ Alsludge. Equilibrium P concentration was highest in the loam treated with Ca-sludge and in the loamy sand treated with Fe-sludge. The solubility of P in Ca-sludge-amended soil appears to be limited by the precipitation of octacalcium phosphate. The Fe-sludge decreased soil pH, and this increased P solubility. Soil Fe and Al oxide content was increased by sludge application; this increased P retention in soil through sorption and occlusion by the oxides. Calcite in the Ca-sludge-amended soil provided additional sorption sites. Fractionation of soil P showed that just over 50 percent of inorganic P in the Ca-sludge treatment and about 70 percent in the Al- and Fe-sludge treatments were Al- plus Fe-P. The relatively high Al- plus Fe-P in the Ca-sludge treatment resulted from the use in 1977 of a sludge treated with Ca and Fe. More P was present as loosely bound P (NH4Cl-extractable) and as a Ca-P in the Ca-sludge treatment than in Al- and Fe-sludge treatments.
TL;DR: In this article, experiments were conducted to determine if soil aeration could be improved and if the oxygen stress brought about by flooding could be reduced by adding peroxide to the soil-root medium.
Abstract: We conducted experiments designed to determine if soil aeration could be improved and if the oxygen stress brought about by flooding could be reduced by addition of peroxide to the soil-root medium. Tomato plants (Lycopersicon esculentum Mill.) growing in containers filled with a potting mix of peat moss and sand were subjected to combinations of treatments with and without flooding and peroxide additions. Aeration status of soil mixes during the study was measured with platinum microelectrodes for redox potentials (EH7) and oxygen diffusion rates (ODR). Plant heights were measured at weekly intervals, and shoots were harvested for fresh and dry weights. The growth of tomato plants watered as required was not increased by peroxide fertilization. Plants that were flooded, however, did grow significantly better when peroxide was included in either the flooding solution or the watering solution after flooding. Redox potential measurements, taken after 48 hours flooding, were below the value of 320 to 340 mV, at which point oxygen becomes depleted from soil. The high ODR values indicated good oxygen availability in the mix prior to the first flooding and prior to harvesting.
TL;DR: In this article, the authors used regression analysis to examine the relationship between CEC and clay and organic matter and to estimate both the CEC of the clays and organic contents and their contribution to the soil CEC.
Abstract: Cation exchange capacity (CEC), clay content, and organic matter content data were collected for 170 profiles of 49 New Jersey soil series. Regression analysis was used to examine the relationship between CEC and clay and organic matter and to estimate both the CEC of the clay and organic matter and their contribution to the CEC of the soils. The data were partitioned by major soil horizon, geomorphic province, soil orders of Soil Taxonomy, and great soil group and were analyzed to determine both the ability of the partitioning of the data to improve the regression and to define groups having distinct relationships between CEC and clay and organic matter. Multiple regression indicated that 59 percent of the variation in the CEC of all the data could be explained by variation in clay and organic matter contents, with the clay having a CEC of 35 and the organic matter 217 milliequivalents per 100 grams. Partitioning the data by geomorphic province or by soil order proved superior in defining groups of soils with distinct clay and organic matter CEC. Poor correlations were obtained between CEC and clay and organic matter for soils of the Piedmont province or of the Alfisol order, indicating either other sources of CEC or variability in the clay mineralogy, organic matter composition, or both in these classes of data.
TL;DR: In this article, a 0.1 M sodium pyrophosphate extractor was used to extract organic complexes of Al and Fe from podzolic B horizons, which contained Fe, Al, Si, P, and Na, as indicated by energy dispersive x-ray analysis.
Abstract: Centrifugation for long times or at high speeds resulted in progressively decreasing concentrations of iron and aluminum in 0.1 M sodium pyrophosphate extracts of soil. Centrifugation at 80 000 g for 6 hours, as compared with 20 000 g for 20 minutes, decreased the Fe concentrations from 23 to 80 percent and the Al concentrations from 9 to 35 percent in nine samples of podzolic B horizons. The sediments contained Fe, Al, Si, P, and Na, as indicated by energy dispersive x-ray analysis, and carbon. Chemical analysis of some of the sediments showed that Fe was usually the dominant component, but that percentages of Al and Fe were similar in extracts of two Fe-poor B horizons. The results are discussed in relation to the concept that 0.1 M sodium pyrophosphate extracts organic complexes of Al and Fe, and in relation to chemical criteria for spodic horizons.
TL;DR: In this paper, conductimetric and potentiometric titrations of H- and Al-muck were conducted to characterize the nature of acidity in H-, Al-organic matter.
Abstract: Because conductimetric titrations and potentiometric titrations have been used to characterize acidity in soil clays, we conducted conductimetric and potentiometric titrations of H- and Al-muck to characterize the nature of acidity in H-, Al-organic matter. Four samples of muck were used as models for soil organic matter. In addition, a carboxylic resin was used for comparison with the natural materials. Results from both potentiometric and conductimetric titrations showed that Al tended to lower the acid strength compared to H-organic matter. Also, Al is hydrolyzed in organic matter, as it is in clays, producing H+ ions and buffering the system against increases in pH. However, complexed Al does not seem to react with base, at least over short periods of time (1 day). Thus, the adsorbed Al is not titratable and tends to lower the effective CEC and total acidity in organic matter. Whether or not complexed Al reacts slowly with base and affects the lime requirement in mineral soil remains to be determined.
TL;DR: In this article, the Bache and Williams index was used to estimate the phosphate sorptivity of topsoil and subsoil samples from 9 orders and 26 great groups of the Soil Taxonomy.
Abstract: We estimated the phosphate sorptivity of 290 samples (topsoil and subsoil) from 9 orders and 26 great groups of the Soil Taxonomy, in terms of the Bache and Williams index. Among these samples, entisols, alfisols, mollisols, and ultisols generally had lower than average sorption indices, and vertisols higher than average. Samples from histosols, inceptisols, oxisols, and spodosols varied greatly in sorption index, but there is usually an explanation for this variation in terms of a property or properties considered at the family level of the Soil Taxonomy. Some statistical evidence is given to show that the variation in sorption index within soil series is usually considerably less than the variation in a more diverse collection of soil samples.
TL;DR: The results indicate that even if the concentration of at least some elements is too low to have any visual effects, they can have important consequences if other trace element stresses are simultaneously present as discussed by the authors.
Abstract: Bush bean plants were grown 15 days in solution culture to test whether or not multiple trace elements that result in little or no apparent stress when applied alone would result in more or less stress when applied together. Prior experience had indicated these possibilities, and the matter is of considerable concern in establishing threshold levels for excesses of some trace elements in the environment. Levels of cadmium (5 X 10−7 M), copper (10−5 M), zinc (5 X 10−5 M), manganese (10−4 M), cobalt(10−6 M), and nickel (10−6 M) were applied singly; cadmium, copper, and zinc together; manganese, cobalt, and nickel together; and all six combined. Little or no stress was expected for some of the single elements; the yield depression in dry weight of trifoliate leaves for the experiment was 0 percent for cadmium, 2 percent for copper, 43 percent for zinc, 32 percent for manganese, 0 percent for cobalt, and 4 percent for nickel. For cadmium, copper, and zinc together the depression was 46 percent; for manganese, cobalt, and nickel, 23 percent, and for all six, 85 percent. Additive, protective, and synergistic effects were involved, although induced iron deficiency complicated the results for all six elements combined. The results indicate that even if the concentration of at least some elements is too low to have any visual effects, they can have important consequences if other trace element stresses are simultaneously present.
TL;DR: In this paper, the binding of diquat and paraquat to humic acid, at low concentrations of adsorbates and adsorbents, was described under various conditions, and it was shown that binding interaction was mainly electrostatic in nature.
Abstract: Binding of diquat and paraquat to humic acid, at low concentrations of adsorbates and adsorbents, is described under various conditions. Ionic strength and variations in size and charge indicated that binding interaction was mainly electrostatic in nature. Scatchard plots indicated that two
TL;DR: A chemical and NMR study of a set of phenolic polymers of the type long proposed as possible synthetic models for humic acid was performed in this paper. But it was performed by air oxidation of p-benzoquinone and ammonium chloride.
Abstract: We made a chemical and NMR study of a set of phenolic polymers of the type long proposed as possible synthetic models for humic acid. Twelve polymers were prepared by air oxidation of p-benzoquinone, and p-benzoquinone plus ammonium chloride, glycine, diglycine, triglycine, alanine, dialanin
TL;DR: Greenhouse and laboratory experiments were conducted to characterize the chemical form or forms of Cd, which is a contaminant in phosphate fertilizers, in terms of plant availability and extractability from soil Winter wheat (Triticum aestivum L), cv Nugaines, was grown on Mountview silt.
Abstract: Greenhouse and laboratory experiments were conducted to characterize the chemical form or forms of Cd, which is a contaminant in phosphate fertilizers, in terms of plant availability and extractability from soil Winter wheat (Triticum aestivum L), cv Nugaines, was grown on Mountview silt
TL;DR: In this article, the sorption of three nitrogen-heterocyclic compounds (acridine, biquinoline, and dibenzocarbazole) on 14 soils and sediments with a wide range of properties was examined.
Abstract: The sorption of three nitrogen-heterocyclic compounds (acridine, biquinoline, and dibenzocarbazole) on 14 soils and sediments with a wide range of properties was examined The compounds produced linear sorption isotherms (K/sub p/ = C/sub s//C/sub w/) When sorption was expressed on a constant organic carbon basis (K/sub oc/=K/sub p//organic carbon) The K/sub oc/ values obtained were in good agreement with K/sub oc/ values predicted from K/sub oc/ - S and K/sub oc/ - K/sub ow/ relationships established for other classes of compounds This study expands these relationships to include N-heterocyclics, particularly the lower, water soluble members of this family