Showing papers on "Sodium sulfite published in 1997"

Water filtration media, apparatus and processes

Abstract: An amorphous potassium aluminosilicate filtration media which may be mixed with activated carbon filters water to remove oxygen, chlorines, hardness, alkalinity, ammonia, hydrogen, hydrogen sulfide, sodium sulfite and other contaminants. The particular sodium aluminosilicate is a porous amorphous material formed under ultraviolet light or sunlight to produce pore sizes of 60 Å to 250 Å at ambient temperatures (20° C.-35° C.) and low relative humidity (5%-20%). The media is initially formed as a microporous primarily amorphous gel containing Na 2 O, Al 2 O 3 , SiO 2 and H 2 O. The sodium therein is displaced by potassium, whereby the filter removes impurities from water without introducing sodium. The potassium aluminosilicate may be a second stage filter to a first stage filter composed of a strong base anion media charged with potassium carbonate and/or bicarbonate. The filtration media may be used in any type gravity filter including that in an inverted bottle type dispenser for filtering water the flowing from the bottle to the spigot and also filtering air which bubbles back into the bottle in response to opening the spigot. The media as blended with activated carbon may be composed of molded particles having diameters from 1 to 100 microns and preferably 1-20 microns with an average diameter of about 10 microns. It also may be blended with zirconium oxide without carbon for reducing anion and cation species from drinking water.

Studies of Corrosion and Corrosion Control in a CO2−2-Amino-2-methyl-1-propanol (AMP) Environment

Abstract: Corrosion and corrosion inhibition in a sterically hindered amine, 2-amino-2-methyl-1-propanol (AMP), were investigated by static weight loss tests. The corrosion data were compared with those of monoethanolamine (MEA), a conventional alkanolamine, which was simultaneously tested under the same conditions. The results indicated that the AMP system was generally less corrosive to carbon steel than the MEA system, but corrosion control is still necessary. Sodium metavanadate (NaVO3) and sodium sulfite (Na2SO3) were proven to be effective corrosion inhibitors, with more than 90% protection efficiency.

Improved Detection of Polygalacturonase Activity due to Mucor piriformis with a Modified Dinitrosalicylic Acid Reagent.

Abstract: An assay for determination of galacturonic acid with 3,5-dinitrosalicylic acid was developed that substantially extends the linear range of detection compared to a previously published method with this reagent. In the improved assay, galacturonic acid was detected with a reagent containing 44 mM 3,5-dinitrosalicylic acid, 4 mM sodium sulfite, and 375 mM sodium hydroxide. The absorbance of the solution after reaction with galacturonic acid was determined at 575 nm and was linear at concentrations of galacturonic acid up to 50 μmol, with a lower limit of detection at ~400 nmol. The assay with the improved reagent could be performed in wavelength ranges from 550 to 575 nm, with higher sensitivity at the shorter wavelengths. The new reagent was used in routine assays of polygalacturonase activity in culture filtrates of the important postharvest fungal pathogen Mucor piriformis.

Effect of sodium sulfite, sodium bisulfite, cysteine, and pH on protein solubility and sodium dodecyl sulfate-polyacrylamide gel electrophoresis of soybean milk base

Abstract: Protein modification is often used to improve the functional properties of proteins in many different food products. The purpose of this study was to investigate the effect of modification of soy proteins with sodium sulfite, sodium bisulfite, and cysteine on the protein solubility of a soy milk base, as determined by protein dispersibility index (PDI). An increase in the PDI was observed at 6−8 mmol/L concentration of each reagent; the most effective was sodium bisulfite, followed by sodium sulfite and cysteine. Sodium dodecyl sulfate−polyacrylamide gel electrophoresis (SDS−PAGE) showed that chemical treatments resulted in an increase in the intensity of several bands with molecular weights of 16 000−20 000, 32 000−42 000, 60 000, and 90 000, which correspond to the polypeptides of the two major proteins of soybean, i.e., 11S (glycinin) and 7S (β-conglycinin) globulins. These data suggest that the chemical treatment has cleaved the disulfide bonds which link the polypeptides, thereby increasing the PDI. ...

Phosphorimetric determination of dipyridamole in pharmaceutical preparations.

Abstract: Room temperature phosphorescence was applied to the determination of dipyridamole in pharmaceutical preparations. The response was linear in the concentration range 100–1600 ng ml - 1 . The use of phosphorescence enhancers such as thallium(I) nitrate (external heavy atom), sodium dodecyl sulfate (microemulsion stabilizer) and sodium sulfite (deoxygenation agent) was studied and optimized to obtain maximum sensitivity and adequate selectivity. The determination was performed in 0.026 M sodium dodecyl sulfate, 0.0156 M thallium nitrate and 0.02 M sodium sulfite. The pH value was 11.5, adjusted by adding sodium hydroxide. The phosphorescence was totally developed in 15 min, after that the intensity was measured at λ ex = 303 nm and λ em = 616 nm. The recovery of the method was tested on commercial formulations containing dipyridamole. The recoveries obtained were 94.67 ± 0.58% for Persantin and 96.75 ± 1.37% for Asasantin. The overall least squares regression method was applied to find the most exact straight line that fits the experimental data. The detection limit according to the error propagation theory was 16.4 ng ml - 1 . The repeatability and relative standard deviation were also determined according to this theory.

Redox Reaction Catalyzed by a Porous Graphite Carbon Packing and its Application to Selectivity Enhancement of High-performance Liquid Chromatography Separation of Metal Complexes

Abstract: A new HPLC method was developed for the selective separation of metal complexes by using a redox reaction as a secondary chemical equilibrium. In a study of the reversed-phase ion-pair liquid chromatography of trans-1,2-diaminocyclohexanetetraacetate (DCTA) complexes of transition metal ions, it was noted that the redox reaction between the divalent and trivalent cobalt complexes were extremely accelerated by using a porous graphite carbon (PGC) column. This finding was ascribed to the catalytic effect of the PGC. The retention of Co–DCTA complex can be modified by treating the PGC column with the eluent containing sodium sulfite. The cobalt complex was completely separated from 1000-fold molar excess of the BiIII, FeIII, CuII, and NiII complexes.

Production of 5-amino-2,4,6-triiodoisophthalic acid

Abstract: PROBLEM TO BE SOLVED: To obtain the subject compound useful as an intermediate for producing roentgen contrast media, etc., in a high purity without lowering a product yield by reacting iodine monochoride with an aminoisophthalic acid, separating useful components in the mother liquor, and subsequently returning the solution of the separated components to the reaction system. SOLUTION: This method for producing 5-amino-2,4,6-triiodoisophthalic acid compriss reacting 5-aminoisophthalic acid with the hydrochloric acid solution of iodine monochloride in the presence of a catalyst such as sulfuric acid or phosphoric acid in an aqueous solution, separating the crystals of the obtained triiode compound from the reaction solution, adding a reductive substance such as sodium sulfite or potassium sulfite to the left mother liquor, bringing the mixture into contact with activated carbon at an oxidation reduction potential of 50-400 mV (preferably 270-270 mV) at 15-25°C, eluting the components adsorbed on the activated carbon with 1-20 wt.% of an alkaline aqueous solution (e.g. sodium hydroxide potassium hydroxide) as an eluting agent, and returning the recovered solution as a reaction solvent to the reaction. COPYRIGHT: (C)1998,JPO

Self-removed, quick dissolved, quick effect double layer disinfecting tablet and process for producing same

Abstract: This tablet is mainly composed of symclosene, sodium sulfite and auxiliary material. Firstly, sodium sulfite and polyvinyl pyrrolidone are pressed into tablet core, then symclosene, sodium bicarbonate, tartaric acid, sodium sulfate, sodium dodecyl sulfonate, lauryl magnesium sulfate, sodium carboxymethyl cellulose are thoroughly mixed and then the two are pressed by a tablet machine into double layer tablets. By using this tablet, it can effectively preventing the residual toxicity and corrosive action of residual chlorine. It is a stable, non-toxic, non-irritant, broad spectrum, high efficiency low price antiseptic, and is applicable to aifferent kinds of drinking water.

Reduction of disinfected byproduct in membrane separation process

Abstract: PROBLEM TO BE SOLVED: To reduce a disinfected byproduct in transmitted water and conc. water, in a process supplying water to be treated to which chlorine dioxide is added as a sterilizing agent to a reverse osmosis membrane module to separate the same into transmitted water and conc. water, by adding a reducing agent to transmitted water and/or conc. water. SOLUTION: In a seawater desalting apparatus, chlorine dioxide is added to seawater pumped up by an intake pump 1 and sulfuric acid is also added thereto and this seawater is passed through a sand filter tank 4 and a cartridge filter 5 and raised in pressure by a high pressure pump 6 to be supplied to a reverse osmosis membrane module 7. A reducing agent is added to the obtained transmitted water and/or conc. water to remove remaining chlorite ions. As the reducing agent, sodium bisulfite or sodium sulfite is designated but sodium bisulfite is pref. used. The reverse osmosis membrane module 7 to be used is pref. composed of a cellulose triacetate having oxidizing agent resistance and chlorine resistance.

Application of Derivative Variable-angle Synchronous Scanning Phosphorimetry in a Microemulsion Medium for the Simultaneous Determination of 2-Naphthoxyacetic Acid and 1-Naphthalenacetamide

Abstract: The applicability of derivative variable-angle synchronous scanning (DVASS) microemulsion phosphorimetry at room temperature (ME-RTP) was demonstrated for the simultaneous determination of the plant growth regulators 2-naphthoxyacetic acid and 1-naphthalenacetamide in soil samples. This technique permits linear or non-linear paths to be scanned at preselected angles through the excitation–emission phosphorescence matrix in order to obtain the highest signal values and interference-free bands. The phosphorescence emission of the two compounds was obtained using sodium sulfite as an O 2 scavenger and thallium nitrate as an external heavy atom salt perturbed in sodium docecyl sulfate microemulsion aqueous solutions. A statistical model of the central composite design type to obtain the optimum phosphorescence responses was applied. The increased selectivity afforded by the DVASS technique permitted the demonstration of its applicability to the simultaneous determination of phosphorescent signals of these two compounds obtained in a microemulsion medium which show closely overlapped profiles giving mean recoveries of 89.0% (n = 5) for 1-naphthalenacetamide and 103.5% (n = 5) for 2-naphthoxyacetic acid, with an RSD of 7.35 and 5.90%, respectively, in real samples.

Experimental Studies of the Factors That Influence 1-Naphthaleneacetamide Determination by Micelle-stabilized Room-temperature Phosphorescence

Abstract: A micelle-stabilized room-temperature phosphorescence (MS-RTP) method was developed for the determination of the phytohormone 1-naphthaleneacetamide residues in fortified pear samples. The proposed method is based on the use of a micellar medium obtained by the surfactant sodium dodecyl sulfate in the presence of thallium nitrate as an external heavy atom salt. To avoid oxygen quenching, sodium sulfite solution was used. To establish the optimum experimental variables, a complete and exhaustive statistical analysis of the experimental data by a multivariate optimization approach was performed. MS-RTP spectra were obtained and successfully used to determine 1-naphthaleneacetamide by the established method without further separation, with a detection limit of 25 ng ml - 1 . The precision (RSD ≤ 2.55%) and recovery (≥ 91.9%) were satisfactory.

Production of fluorescent whitened paper

Abstract: PROBLEM TO BE SOLVED: To obtain fluorescent whitened paper having improved light fastness as the largest problem by treating highly whitened paper using a stilbene-based fluorescent whitening agent with a reducer. SOLUTION: A stilbene-based fluorescent whitening agent is added to a raw pulp slurry together with a reducer such as sodium thiosulfate, sodium sulfite or sodium hydrogensulfite and subjected to papermaking to obtain fluorescent whitened paper. Otherwise, the reducer may be applied on the paper during the papermaking after adding the stilbene-based fluorescent whitening agent to the raw pulp, or may be applied after the papermaking.

Mixing agent for soil amelioration and soil amelioration method

Abstract: PROBLEM TO BE SOLVED: To execute a soil amelioration of sludge, the sludge high in water content especially and to utilize the sludge effectively. SOLUTION: A mixing agent consisting of nickel sulfate, a surfactant and either one kind among potassium chloride, calcium chloride, magnesium sulfate, potassium permanganate, sodium sulfate or sodium sulfite is mixed to sludge together with cement or an ettringite forming auxiliary such as fly ash at need and the mixture is solidified.

Photochemical introduction of superacidic sites on fluoropolymer surfaces

Abstract: Photoirradiation of fluoropolymer films in contact with an aqueous solution of sodium sulfite made the surface hydrophilic. After ion exchange with concentrated sulfuric acid, the surface showed a high acidity and induced the cationic polymerization of N-vinylcarbazole, which is based on the presence of sulfonic acid groups on the fluoropolymer chain. It is strongly suggested that the reaction proceeds in an electron transfer mechanism where fluoropolymer is activated by the capture of hydrated electron photochemically released from sulfite ion (SO 3 2- ).

Iron Assay and Size Exclusion High Performance Liquid Chromatography of Ferritin and Magnetoferritin

Abstract: A size-exclusion HPLC method was developed for analysis of the ferritin and magnetoferritin samples. In the ferritin sample three peaks corresponding to aggregate and monomer were observed, which are in contrast to the magnetoferritin sample in which only two peaks corresponding to aggregate and monomer were observed. A sensitive spectrophotometric method was developed for assay of iron in the ferritin and magnetoferritin samples. The method involves solubilization of iron core by HCl or acetic acid, reduction of Fe3+ to Fe2+ with sodium dithionite or sodium sulfite, and reaction of Fe2+ with 2, 2′ bipyridyl. Increasing concentration of acetic acid or sodium sulfite increased the iron content, suggesting that higher concentration of these reagents are needed to solubilize the iron core and to reduce Fe3+ to Fe2+, respectively. An HPLC analysis of the protein after the experiment demonstrated that the proteins do not survive the analysis conditions.

Chemical for treating boiler water

Abstract: PROBLEM TO BE SOLVED: To improve the anticorrosive effect on both a boiler body an a steam condensate system pipeline with one liquid by using a heterocyclic compound having N-substituted amino groups, and a neutralizing amine as the constituents. SOLUTION: Boiler water in an amount of 1l is formulated with a heterocyclic compound having N-substituted amino groups, such as N-aminomorpholine, 1-aminopyrrolidine, 1-amino-4-methylpiperazine or 1,4-diaminopiperazine, in an amount of 0.001-1,000mg, preferably 0.01-300mg, more preferably 0.02-100mg, a neutralizing amine, such as cyclohexylamine or 2-amino-2-methyl-1-propanol, in an amount of 0.001-1,000mg, preferably 0.02-100mg, and if necessary, a dioxidizer such as hydrazine, sodium sulfite, succinic acid or gluconic acid, or a corrosion inhibitor, and a dispersant, a chelating agent, a scale inhibitor, or a mixture thereof.

Reaction of 1,6-dioxaspiro[2.5]octane with nucleophiles

Abstract: The reaction of 1,6-dioxaspiro[2,5]octane with methanol, phenols, thiols, thiocyanic and 2,4-dichlorophenoxyacetic acids, sodium sulfite, and thiourea occurs with fission of the oxirane ring in accordance with the Krasuskii rule.

Concentrated composition for fixing photographic materials

Abstract: FIELD: photographic materials SUBSTANCE: composition contains (in g/l): crystalline sodium thiosulfate, 1000-1620; anhydrous sodium sulfite, 20-40; ice acetic acid, 263-473; 25% ammonium hydroxide solution, 272-544; 1-hydroxyethylidenediphosphonic acid, 05-10; ammonium fluoride, 300-600; ethylenediaminetetraacetic acid, 10-20; and water to 1 l EFFECT: elevated working capacity of solution 2 tbl

Chlorine gas treatment method

Abstract: PROBLEM TO BE SOLVED: To effectively decompose a large quantity of chlorine gas in a high concentration at a high temperature in a wide range of operation conditions with a simple means by carrying out a first step contact adsorption treatment for chlorine gas in a specified flow rate with an alkaline adsorptive liquid after leading the gas into a jet scrubber and then carrying out a second step contact adsorption treatment for the resultant chlorine gas with an alkaline adsorptive liquid in a filled tower type adsorption tower SOLUTION: Chlorine gas A in 50-100 volume % of chlorine concentration from normal temperature to 140 degC is introduced into a jet scrubber 1 at 10m / minute flow rate or higher and brought into contact with an alkaline adsorptive liquid D At that time, by the sensible heat and the reaction heat of the chlorine gas A, the liquid temperature of the alkaline adsorptive liquid rises at an outlet of the jet scrubber 1 After that, the chlorine gas A is introduced into a filled tower type adsorption tower 2 and brought into contact with an alkaline adsorptive liquid and consequently, chlorine is almost completely adsorbed and removed The chlorine concentration in the resultant discharged gas B is controlled to be 1ppm or less and further, the effective chlorine adsorbed in the adsorptive liquid D is decomposed by a reducing agent E of sodium sulfite

Reactivity of 2-substituted 3-ethylsulfonylpyridines

Abstract: 2-Chloro-3-ethylsulfonylpyridine 6 was transformed by acidic or basic hydrolysis into 2-hydroxy-3-ethylsulfonylpyridine 4, which was in the OH form, i.e. without the 2-pyridone isomer. Diazomethane however transformed 4 into the mixture of the N- and O-methyl derivatives. Sodium sulfite reaction with 6 generated 2-sodiumsulfonate-3-ethylsulfonylpyridine 7. This did not react with SOCl2, and PCl5 transformed it into 6, no 2-sulfonylchloridepyridine being isolated. Potassium phthalimide reaction with 6 gave 2-phthaiimido-3- ethylsulfonylpyridine 8', which was transformed by hydrazine into 2-amino-3-ethylsulfonylpyridine 8. This was not transformed by heating in acidic or basic aqueous solutions. In dilute acid solution, sodium nitrite transformed 8 into 4. in concentrated hydrochloric acid, the diazonium salt of 8 however was not formed. 2(N-(4,6-Dimethoxy)pyrimidin-2-yl)amino-3-ethylsulfonylpyridine 3 in concentrated hydrochloric acid was transformed into 8, the intermediate N-(3-ethylsulfonyl-pyridine-2-yl)-guanidine 9 being isolated when the heating time was shorter.

Structure, interaction potentials, and vibrational spectra of the sulfite ion coordinated to alkaline element ions

Abstract: Potential surface sections in the complexes of SO 3 2- with Li+ and Na+ are calculated by the CNDO method with a modified potential of interaction between the cores. It is established that the equilibrium geometry of the coordinated sulfite ion corresponds to the bidentate coordination of the onion to the Li+ and Na+ cations. Frequencies of normal vibrations are determined for four types of anion coordination to cations and compared with the experimental frequencies in aqueous sodium sulfite. The bidentate coordination gives the best correspondence with the experimental spectrum.

Synthesis of Some Crystal Forms of Strontium Sulfite by Metasilicate Gel Method and Crystal Form Control

Abstract: The purpose of this study is to synthesize strontium sulfite crystals with characteristic forms by a metasilicate gel-growth method and to determine the optimum conditions for synthesis of the crystals. Strontium ions were diffused into metasilicate gel including sulfite ions in order to synthesize strontium sulfite crystals. The crystals were synthesized in the pH range of 4.0 to 11.0, at a diffusion temperature between 5 and 40 °C, in the following concentration ranges: sodium sulfite, 0.2 to 1.5 mol dm−3, and strontium chloride, 0.2 to 3.0 mol dm−3. As a result, strontium sulfite crystals were obtained in the following four forms: spherical, poly-spherical, ellipsoidal, and spindle. The cause of the crystal form change was found to be a difference in the growth side by comparison of X-ray diffraction patterns. In addition, the optimum conditions which controlled the crystal form were influenced by the pH value in the gel and the temperature.

Osmium removing method for aqueous solution containing osmium as impurity

Abstract: PROBLEM TO BE SOLVED: To effectively remove osmium as volatile OsO4 from an aqueous solution containing osmium as an impurity generates refining and copper refining process by blowing an oxygen-containing gas to the solution. SOLUTION: In evaporation removal of osmium contained in a slight amount in an aqueous solution, the pH and redox potential of the aqueous solution are adjusted and then a gas for evaporation such as an inert gas, oxygen, etc., is blown to the aqueous solution while converting osmium into OsO4 . In this case, it is preferably that the gas for evaporation is blown to the aqueous solution after a reducing agent such as sodium sulfite, potassium sulfite, sulfurous acid, is added to the aqueous solution containing osmium and the redox potential of the aqueous solution is lowered to 300mV based on the Ag/AgCl electrolysis standard. As a result, OsO4 , which is a volatile oxide, can be carried by the gas for evaporation in gas phase and osmium can be removed within a short time.

Treatment method for desulfurization wastewater

Abstract: PROBLEM TO BE SOLVED: To stably produce a sodium hydrogensulfite solution in concentration of not less than 34% and containing not more than 1% of by-product sodium sulfate at high adsorption efficiency as a by-product from a combustion gas produced by burning wastewater produced in wet type desulfurization of a coke furnace gas. SOLUTION: A combustion gas discharged out of a sodium hydrogensulfite producing part 2 in the prior stage of a two-stage adsorption method is led to a sodium sulfite producing part 3 in the post stage, pH is controlled to be 6.0-7.0, preferably 6.0-6.7, and the resultant gas is brought into contact with an aqueous sodium hydroxide solution in countucurrent flow to produce sodium sulfite. Then, the obtained combustion gas containing sulfurous acid gas in 3-8vol.% concentration is led to the sodium hydrogensulfite producing part 2, pH is controlled to be 4.0-5.0, preferably 4.3-4.8, and the resultant combustion gas is brought into countucurrent flow contact with a sodium sulfite-concentrated adsorption liquid to give sodium hydrogensulfite.

Mechanisms of tolerance to sulfur dioxide and sodium metabisulfite

Abstract: Inhalation of sulphur dioxide (250 ppm), (SO2) or sodium metabisulfite (80 mM) (MBS) aerosol or perfusion with MBS (3 mM) induced a reduction in compliance and conductance in the isolated, perfused and ventilated guinea pig lung. Pretreatment of the lung with sodium sulfite (3 mM), a dissolution product of SO2 and MBS, reduced the bronchoconstriction induced by SO2 and MBS. Bronchoconstriction induced by SO2 and MBS in associated to increased levels of Calcitonin gene-Related Peptide (CGRP) in the perfusate effinent, indicating activation of sensory nerves. The release of CGRP induced by SO2 and MBS was not affected by sodium sulfite. Sulfite treatment did not modify lung reactivity towards acethylcholine, bradykinin, serotonin, histamine and substance P (fragment 5-11). An inhibitory effect by sulfite was observed on bronchoconstriction induced by neurokinin A (fragment 4-10). Since bronchoconstriction induced by SO2 and MBS appears to be mediated by neurokinin A release and action, sulfite may act by affecting its signal transduction pathway. In conclusion, the results indicate that during exposure to some environmental and occupational pollutants, e.g. SO2 and MBS, critical modifications of sulfhydryl groups on smooth muscle receptors may occur. We hypothesise this as a possible step in the development of tolerance and hyperreactivity.

Method of preparing polysulfide oligomers

Abstract: technology of synthesis of polysulfide oligomers used as substrate of sealing, adhesive and pouring materials in various industries including optics and optoelectronics. SUBSTANCE: described is method of preparing polysulfide oligomers by reacting organic di- and polyhalides of general formula: R(Cl)n wherein R is aliphatic hydrocarbon or oxygen-containing hydrocarbon radical, n is equal or more than 2, in aqueous medium with sodium thiosulfate and subsequently reacting thiosulfate derivatives with sodium hydrosulfide during heating operation. Reaction of di- and polyhalides with sodium thiosulfate is carried out in the presence of sodium sulfite in amount from 5 to 20 wt.pts per 100 wt.pts of di- and polyhalides. EFFECT: optically pure polysulfide oligomers with light transmission value up to 100%. 2 ex

Intramolecular and Bimolecular Nucleophilic Substitutions of Rimsulfuron Sulfonylurea.

Abstract: The sulfonylurea herbicide rimsulfuron 1 (N-((4,6-dimethoxypyrimidin-2-yl)aminocarbonyl)-3-(ethylsulfonyl) -2-pyridinesulfonamide) in aqueous solutions of KOH, NaOH, NH4OH, or dilute HCl, and thermally (rimsulfuron or monomethylated rimsulfuron at the sulfonamide hydrogen) was transformed by SO2 extrusion and intramolecular nucleophilic substitution into 2-(N-(4,6-dimethoxy)pyrimidin-2-yl)amino 3. In mild methanol + HCl conditions, the intermediate rearranged urea N-(4,6-dimethoxypyrimidin-2-yl)-N-((3-(ethylsulfonyl)-2-pyridinyl)urea 2 was isolated. In concentrated hydrochloric acid, rimsulfuron 1 was transformed by bimolecular nucleophilic substitution successively into 2-chloro-3-ethylsulfonylpyridine 6 and 2-hydroxy-3-ethylsulfonylpyridine 4. Sodium sulfite transformed rimsulfuron 1 into a mixture of 2-sodiumsulfonate-3-ethylsulfonylpyridine 7 and amine 3.