Showing papers in "Analytica Chimica Acta in 1973"

TL;DR: The enzyme electrode determination of blood sugar compares favorably with commonly used methods with respect to accuracy, precision, and stability.

TL;DR: The correlation between extraction data and electrode behaviour assisted in explaining the vital properties of organophosphate-based calcium electrodes, and in suggesting a new liquid ion exchanger, di-(n-octylphenyl) phosphoric acid as discussed by the authors.

TL;DR: In this paper, a potassium electrode utilizing a solution of valinomycin in diphenylether and a porous membrane is compared with selectrodes in which the diphenylther has been replaced by a suitable plasticizer and the porous membrane support by a polymer net-work.

TL;DR: The glucose electrode constructed and the use of flow-stream experiments with two iodide sensors provided accurate and convenient glucose determinations in the absence of some oxidizing and reducing agents.

TL;DR: In this paper, the use of computer calculations for the determination of the systematic errors associated with Gran plots is demonstrated, and the results of such calculations are used to derive modified Gran plots capable of locating the equivalence point both more accurately and more precisely.

TL;DR: In this article, the oxine-containing chelating ion-exchangers described in the literature have been synthesized and their properties determined, together with equilibration rates and swelling properties.

TL;DR: In this paper, the authors measured the loss of mercury at different pH values by flameless atomic absorption for a total of 17 days and found that the most severe losses of mercury were observed at pH 2 and 7.

TL;DR: Three distinct mechanisms of ethanol loss were identified: a highly temperature-dependent ethanol oxidation reaction which was independent of the ethanol concentration over a wide range; destruction of ethanol by the action of micro-organisms in the absence of a preservative, and diffusion which was found to occur from 5.6% of the polypropylene containers used in Britain for the purposes of the Road Traffic Act 1972.

TL;DR: An overall mechanism is proposed for blood ethanol oxidation and the stabilization of blood ethanol solutions and the reaction is first order with respect to oxyhaemoglobin concentration and zero order withrespect to ethanol concentration.

TL;DR: In this article, a new analytical technique, utilizing such emissions, is described; the sample is deposited within a cavity at the end of a rod, and emission is stimulated within the cavity when placed in a hydrogen flame.

TL;DR: In this paper, a method based on anodic stripping voltammetry at the mercury-coated graphite electrode has been developed for the direct determination of bismuth and antimony at their natural levels in sea water.

TL;DR: In this paper, the application of an inductively coupled high-frequency plasma source to the determination of iodine, mercury, arsenic, and selenium by atomic emission spectrometry at wavelengths less than 200 nm is described.

TL;DR: In this paper, the ion exchange behavior of Dowex 1-X8 was investigated in a wide variety of aqueous mixed hydrochloric acid-hydrofluoric acid and secondly in the same aQous system mixed with various organic solvents.

TL;DR: An improved urea enzyme electrode applied for the determination of urea in blood samples showed good agreement with a standard spectrophotometric method, and routine clinical assays of blood urea are feasible.

TL;DR: In this paper, a computer program capable of handling five acids simultaneously has been designed to evaluate the titration data, and the results show that it is possible to determine two acids which have stability constants differing by only about one logarithmic unit with an accuracy better than 1%.

TL;DR: Selenium(IV) is reacted with 2,3-diaminonaphthalene at pH 2 to form the well established complex, which is extracted into hexane, which was applied to the determination of physiological amounts of selenium in human blood and urine.

TL;DR: A method for the determination of chromium in sea water is described which requires minimal sample preparation and detection limits for the methods are 0.05 μg 1-1 in the soluble phase and 0.06 μg 2-3 in the particulate phase.

TL;DR: In this article, a carbon filament atom reservoir and a graphite tube atomizer are compared as methods for the determination of germanium by atomic absorption spectrometry, and it is shown that the filament technique is not applicable, probably because of loss of the sample as a volatile oxide species which results in inefficient atomization.

TL;DR: In this article, 15 azo dyes containing the m-dimethylaminophenol group were synthesized, and their analytical potential for the determination of metals was studied spectrophotometrically.

TL;DR: In this article, the selectivity coefficients of liquid-membrane electrodes for common inorganic anions were measured in electrodes containing tris(l,10-phenanthroline)iron(II), tris (4,7-diphenyl-1,10phenanthyl-iron)iron (II) or tetraheptylammonium ion in nitrobenzene, and tris[n-amyl alcohol as the liquid membrane, suggesting that aqueous phase solvation energies play a predominant role in determining electrode select

TL;DR: In this article, the half-life time of the first-order desolvation reaction was used to characterize ion-selective electrodes, and a new method was proposed for the characterization of ionselective electrode by the halflife time.

TL;DR: In this paper, a series of cadmium buffers were used for calibration of a newly developed Cadmium Selectrode activated with CdS/Ag 2 S. The electrode exhibits Nernstian response with a sensitivity close to the theoretical limit imposed by the conditional solubility product of cadMium sulphide, i.e., the response is linear up to pCd 9 at pH 6.7 and up topCd 11 at pH 9.

TL;DR: In this article, the first-derivative spectrum can be recorded easily by using dual-wavelength measurements, if the two wavelengths λ 3 and λ 2 are set very close to each other (usually 1-2 nm apart) and scanned simultaneously.

TL;DR: By combining the sensitivity of graphite-furnace atomic absorption spectrometry with the efficiency of the selective collection of molybdenum on p -aminobenzylcellulose or chitosan at pH 2.5, it was possible to determine molyBdenum in as little as 50 ml of sea water.

TL;DR: Concentrations of the elements AI, Cd, Cr, Cu, Fe, Mn, Pb and V were investigated in the International Biological Standard of Bowen by means of atomic-absorption spectrometry with a graphite furnace, finding significant interferences in determinations of lead and vanadium.

TL;DR: The behavior of a simple type of ion-selective electrode for halogens and silver has been studied in this article, which consists of a plastic body filled with carbon paste, the surface of which can be easily renewed.

TL;DR: In this paper, the use of a heated graphite furnace has been evaluated for the atomic absorption determination of zinc in the range 0.002-1 p.m. Interferences were found with most elements when present in large amounts; solvent extraction procedures have been investigated to avoid such effects.