Showing papers on "Sodium sulfite published in 1992"
TL;DR: Simple field-screening methods are presented for detecting 2,4,6-TNT,2,4-DNT and RDX in soil and concentration estimates from field analyses correlate well with laboratory analyses.
124 citations
Journal Article•
67 citations
TL;DR: A method has been designed for the reduction of iodate to iodide in seawater and subsequent determination of total dissolved iodine as iodide by cathodic stripping square wave voltammetry.
33 citations
TL;DR: Anionic isoperoxidases from cotton cotyledonary leaf tissue have been purified to electrophoretic homogeneity by chromatography on ion exchange, lectin affinity, and gel filtration matrices and the absorption spectrum showed maxima at 280 and 402 nm, indicating the presence of a heme group in the active enzyme.
19 citations
TL;DR: In this paper, the kinetics of the heterogeneous oxidation of aqueous solutions of ammonium sulfite with oxygen transferring from the gas phase was investigated by utilizing a stirred cell.
17 citations
TL;DR: It is demonstrated that sulfite may inhibit transport of photoassimilates in plant by a direct inhibition of the sucrose carrier of the plasma membrane.
17 citations
Patent•
25 Nov 1992
TL;DR: In this article, a method for the preparation of oil well cement water-reducing agent sulphonated acetone-formaldedyde condensation polymer was proposed, which utilizes the alkali formed by hydrolysis of sodium sulfite at the catalysis of the condensation reaction, so the addition of strong alkali as catalysis can be avoided, and the prod.cost can be reduced.
Abstract: The invention relates to the preparation method of oil well cement water-reducing agent sulphonated acetone-formaldedyde condensation polymer.The ingredient of acetone,formaldehyde, sodium sulfite and water are compounded according to a definite proportion. Then carries on the hydrolysis reaction of sodium sulfurous, and adds the compounded liquid of formaldehyde, acetone and sodium pyrosulfite into the sodium sulfite solvent in batches.Through controlling the speed of adding the mixed liqud in sodium sulphite solvent to control the speed of reaction so as to solve the problems of not easy to control the reaction speed in past technique, serious evaporation of raw material, and unstable quality of products.The invented method utilizes the alkali formed by hydrolysis of sodium sulfite at the catalysis of the condensation polymerization reaction, so the addition of strong alkali as catalysis can be avoided, and the prod.cost can be reduced and the industrialized prod.can be easily made
11 citations
TL;DR: Aguadulce et al. as discussed by the authors showed that the long-term depolarization of the transmembrane potential difference noticed for concentrations of pollutant higher than 0.1 mM was mainly due to an indirect inhibition of the plasma membrane H+-ATPase activity following the decrease of the available level of ATP.
Abstract: As in other materials, sodium sulfite (Na2SO3) inhibited both respiration and photosynthesis in leaf tissues of broad-bean L. cv. Aguadulce). Under our experimental conditions, photosynthesis was more sensitive (significant inhibition at 10 μM) to the pollutant than respiration (significant inhibition only for concentrations higher than 0.1 mM). Sulfite concentrations higher than 0.1 mM also caused the energy charge of leaf tissues to decline sharply. These results suggest that the long, term depolarization of the transmembrane potential difference noticed for concentrations of pollutant higher than 0.1 mM (Maurousset and Bonnemain, Physiol. Plant. 80: 233–237,1990) was mainly due to an indirect inhibition of the plasma membrane H+-ATPase activity following the decrease of the available level of ATP.
10 citations
TL;DR: In this paper, the effects from chlorination and dechlorination of Savannah River water were studied during the development of biofouling countermeasures for a proposed cooling tower system required for thermal mitigation of nuclear reactor cooling water effluent.
9 citations
TL;DR: An experimental investigation of the rate of sulphur dioxide absorption into sodium sulphite solutions in a cable contactor was made at room temperature for several gas velocities, liquid flow rates and pH values as discussed by the authors.
6 citations
Patent•
05 Feb 1992
TL;DR: In this paper, a mixture of polymaleic anhydride or amino trimethylene-phosphoric acid, and copper sulfate (6.0-8.0 pH value) is added to the mixture, and after mixing them for 1-2 hours and grinding, a powdered green product is finished.
Abstract: This invention features that sodium sulfite, sodium pyrosulfite and potassium nitrate are mixed while zinc chloride and a mixture of hydrolyzed polymaleic anhydride or (and) amino trimethylene-phosphoric acid, and copper sulfate (6.0-8.0 pH value) are added in, and after mixing them for 1-2 hours and grinding, a powdered green product is finished. Such product has the functions of fast deoxidizing and preventing scale, corrosion and algae.
TL;DR: In this article, a cellulose-g-poly(glycidyl methacrylate) copolymer was reacted with aqueous solution containing mixtures of both sodium sulfite and citric acid, in order to synthesize bifunctional cation exchangers containing both sulfonic and carboxylic acid groups.
Abstract: Cellulose-g-poly(glycidyl methacrylate) copolymer was reacted with aqueous solutions containing mixtures of both sodium sulfite and citric acid, in order to synthesize bifunctional cation exchangers containing both sulfonic and carboxylic acid groups. Factors affecting the reaction, such as percent neutralization of citric acid with sodium carbonate, time, temperature, liquor ratio, reagents-to-epoxide molar ratio, and monosodium salt of citric acid-to-epoxide molar ratio were studied. Reaction conditions were selected to prepare five kinds of cation exchangers of different sulfonic and carboxy contents. These exchangers were characterized by potentiometric titrations, durability tests, and water solubility.
Ein Cellulose-Poly(glycidylmethacrylat)-Pfropfcopolymeres wurde mit wassrigen Natriumsulfit/Zitronensaurelosungen umgesetzt, um bifunktionelle Kationenaustauscher mit sowohl Sulfon-als auch Carboxygruppen herzustellen. Der Einflus verschiedener Reaktionsparameter wurde untersucht. Funf verschiedene Kationenaustauscher mit unterschiedlichen Gehalten an Sulfon-und Carboxygruppen wurden synthetisiert und durch potentiometrische Titration, Haltbarkeitsuntersuchungen und Loslichkeits-verhalten in Wasser charakterisiert.
Patent•
22 Dec 1992
TL;DR: In this article, the authors proposed a method to efficiently purify taurine obtained by an organic synthetic method and useful as an antidote in high purity by treating taurines with a strongly acidic cation exchange resin.
Abstract: PURPOSE: To efficiently purify taurine obtained by an organic synthetic method and useful as an antidote in high purity by treating taurine with a strongly acidic cation exchange resin in purifying the taurine from a synthetic reaction mass. CONSTITUTION: After taurine is synthesized by an organic synthetic method the synthetic reaction mass containing taurine is treated with a strongly acidic cation exchange resin so to remove impurities to provide purified taurine. When a large amount of anions are contained as the impurities, preferably the synthetic reaction mass containing taurine is treated with the strongly acidic cation exchange resin and then treated with a weakly basic cation exchange resin. The treating temperature is preferably 10-70°C and the space velocity is preferably 0.5-5h -1 . Furthermore, organic synthesis of taurine is carried out, e.g. by reacting 2-chloroethylamine hydrochloride with sodium sulfite or reacting 2- bromoethylamine hydrobromide with sodium sulfite. COPYRIGHT: (C)1994,JPO&Japio
TL;DR: The results show that removing sodium sulfite and reversing its effect by treatment with 2‐mercaptoethanol are required prior to any study involving native urease, and it is remarkable that the modification occurs at neutral pH.
Abstract: Sodium sulfite is a widely used activity-protective agent for the storage of urease. However, this reagent produces a 10% increase in the anodic electrophoretic mobility of native urease. Changes in the hydrodynamic properties of the enzyme are not involved in that modification. The observed change is related to an increased negative charge of the protein molecule in the presence of sodium sulfite. The results are discussed in terms of sulfitolysis of the single disulfide bond in the urease monomer. It is remarkable that the modification occurs at neutral pH. Our results show that removing sodium sulfite and reversing its effect by treatment with 2-mercaptoethanol are required prior to any study involving native urease.
TL;DR: In this paper, 6-Benzoyl-3-alkyl or 3-aryl sydnoneimines (cf.3) form the 4-bromo congeners 4 cleanly, in good yield using NBS in DMF.
Patent•
28 Oct 1992
TL;DR: In this paper, the authors proposed a method to improve safety and to facilitate the treatment of produced gases by surely decomposing the sodium azide in a liquid to be treated contg. radioactive materials.
Abstract: PURPOSE:To improve safety and to facilitate the treatment of produced gases by surely decomposing the sodium azide in a liquid to be treated contg. radioactive materials. CONSTITUTION:This device has a storage tank 1 for the liquid to be treated, a transfer pump 2, a reaction chamber 3, a sodium sulfite supply system 4 and nitric acid supply system 5 which generate a decomposition reaction, a bent piping 6, and a liquid circulating piping 7. The device decomposes the liquid to be treated little by little and lowers the concn. of the sodium azide by repeating gasification and the conversion to a stable material without increasing the liquid volume.
Patent•
07 Dec 1992
TL;DR: In this article, a bisphenol with an aldehyde and a sulfite or an amino acid or an aliphatic sulfonic acid containing amino group in the molecule in a solid-liquid state is used to obtain a new high-performance condensate useful as water reducing agent of concrete, dispersant, etc.
Abstract: PURPOSE:To obtain a new high-performance condensate useful as water reducing agent of concrete, dispersant, etc., by reacting a bisphenol with an aldehyde and a sulfite or an amino acid or an aliphatic sulfonic acid containing amino group in the molecule in a solid-liquid state. CONSTITUTION:A bisphenol [e.g. 2,2-bis (4-hydroxyphenyl) propane] shown by formula I [X is group shown by formula II (n is 1-5), formula III (R1 is H or alkyl; R2 is alkyl), formula IV (R3 is R1; R4 is alkyl), SO2 or O] or a salt thereof is reacted with an aldehyde (e.g. formaldehyde) and a sulfite (e.g. sodium sulfite) or an amino acid (e.g. sodium glutamate) or an aliphatic sulfonic acid (e.g. sulfonated melamine) containing amino group in the molecule under an aqueous condition in a solid-liquid state to give a new condensate. This condensate has a small amount of low-molecular part and has high performances. The condensate is useful for water reducing agent of concrete, industrial dispersant and ion exchange resin.
Patent•
10 Jun 1992
TL;DR: In this paper, the authors provided a composition of developing and fixing agent for black-white negative film in the bright room, which requires a developing and fix agent and stabilizing agent separately prepared.
Abstract: The invention provides a composition of developing and fixing agent for black-white negative film in the bright room. The invention requires a developing and fixing agent and a stabilizing agent separately prepared. The developing and fixing agent is made of distilled water, alcohol, benzyl alcohol, hydrochinone, anhydrous sodium sulfite, Phenidone, anhydrous potash, hypo, potassium aluminium sulfate, sodium hydrate, etc. The stabilizing agen is made of distilled water, alcohol, sodium rhodanate, formol, sodium sulfate and cleanser. The two agents are prepared through a process of selection, preparation and packing. The usage includes the steps of preparation, developing and fixing, stabilizing, wash in water and drying. It has the advantages of simple method, low cost and fast development of film in bright room.
Patent•
31 Jan 1992TL;DR: In this article, a process for the preparation of 4-alkyl(C 1 -C 4 )-sulfonyl-1-ALKyl-2-chlorobenzenes and like compounds is described.
Abstract: Process for the preparation of 4-alkylsulfonyl-1-alkyl-2-chlorobenzenes and like compounds. A process for the preparation of 4-alkyl(C 1 -C 4 )-sulfonyl-1-alkyl-2-chlorobenzenes, in very good yields and with high selectivity by selectively chlorinating a p-alkyl-benzenesulfonyl chloride with gaseous chlorine in the presence of a chlorine carrier at 50° C. to 100° C. to give a compound of the formula in which R 1 is an alkyl (C 1 -C 4 ) group, subsequently reducing the latter in an aqueous medium at a pH of 8 to 10 with sodium hydrogen sulfite or sodium sulfite at 40 to 90° C. to give a compound of the formula and reacting the latter with alkyl(C 1 -C 4 ) chloride in the presence of an acid binder at 80 to 150° C., and also compounds of the last mentioned formula which, instead of the —SO 2 Na group contain the —SO 2 X group (X=hydrogen atom or alkali metal atom).
Patent•
11 Dec 1992
TL;DR: In this article, the agent for the treatment of dermatosis caused by trichophyton, eczema, etc. is a cleaning liquid composed of 0.01-40wt.
Abstract: PURPOSE:To provide an agent for the treatment of dermatosis caused by tricophyton, eczema, etc. CONSTITUTION:The agent for the treatment of dermatosis caused by trichophyton, eczema, etc., and the agent for the sterilization and activation of skin is a cleaning liquid composed of 0.01-40wt.% of sodium hypochlorite, 0.01-30wt.% of sodium sulfite, 0.01-40wt.% of sodium nitrite, 0.01-40wt.% of sodium potassium chlorate, 0.001-35wt.% of hydrogen peroxide, 0.01-40wt.% of ozonized water, 0.01-40wt.% of sodium potassium nitrate, 0.001-1wt.% of a surfactant and 1-90wt.% of water based on 100wt.% of the cleaning liquid.
Patent•
31 Jan 1992
TL;DR: In this paper, the authors proposed to obtain a good solidified body even if reducing agents of sodium sulfite is incorporated therein by adding and mixing alkaline materials to and with radioactive waste contg reduction type material at the time of mixing a thermosetting resin into this radioactive waste.
Abstract: PURPOSE:To obtain a good solidified body even if reducing agents of sodium sulfite is incorporated therein by adding and mixing alkaline materials to and with radioactive waste contg reduction type material at the time of mixing a thermosetting resin into this radioactive waste CONSTITUTION:The alkaline materials, such as, for example, sodium sulfate and calcium hydroxide, are added and mixed into a unsatd polyester resin before mixing the waste powders when the reduction type materials, such as sodium nitrite, exist in the reduction type materials, such as sodium nitrite, exist in the radioactive waste The terminal groups of the straight chain of the unsatd polyester are inactivated in this way and the dissociation of the reducing agents, such as sodium nitrite, is prevented The effect is further enhanced by using the unsatd polyester resin of a low acid value and a polymn initiator for high temp after the addition of the alkaline materials
Patent•
01 Sep 1992
TL;DR: In this paper, a method for producing an antimicrobial and antifungal material excellent in dispersibility in a synthetic resin and affinity for the synthetic resin was obtained by adding silica gel to a thiosulfatosilver complex salt solution.
Abstract: PURPOSE:To obtain a method for producing an antimicrobial and antifungal material excellent in dispersibility in a synthetic resin and affinity for the synthetic resin. CONSTITUTION:The objective antimicrobial and antifungal material is obtained by adding silica gel to a thiosulfatosilver complex salt solution obtained from silver acetate, sodium sulfite and sodium thiosulfate, stirring the resultant mixture, supporting the silver complex salt on the silica gel, evaporating the solvent component from the mixture of the thiosulfatosilver complex salt solution with the silica gel, providing silica gel supporting the silver complex salt, dispersing the resultant silica gel supporting the silver complex salt in ion exchange water, adding cetyltrimethylammonium bromide (CTABr) and potassium persulfate to the resultant silica suspension, then adding styrene monomer to the obtained suspension, polymerizing the styrene, subsequently adding cupferron thereto, terminating the polymerizing reaction, washing the formed precipitate and drying the precipitate.
01 Jan 1992
TL;DR: Common salt, sodium chloride, occurs in nature in almost unlimited quantities as discussed by the authors, and it has an imposing list of uses, placing it among the more important substances in the economic world.
Abstract: Common salt, sodium chloride, occurs in nature in almost unlimited quantities. It is a direct source of chlorine, caustic soda (sodium hydroxide), sodium chlorate, synthetic soda ash (sodium carbonate), sodium metal, and sodium sulfate. Indirectly, it is also the source of hydrochloric acid and a host of sodium salts. It has an imposing list of uses, placing it among the more important substances in the economic world. It is used to preserve meat, fish, and hides; it is a necessary component of the animal diet; it is used in refrigeration systems; and large quantities are used for ice control on highways in colder climates. Salt is used by the soap maker to separate soap from glycerine and lye, and by the dye manufacturer to precipitate dye products. In addition, salt is used extensively for the regeneration of water-softening resins (see Table 12.1).
TL;DR: In this article, a novel potentiometric titration procedure was developed for the determination of sodium sulfate impurity in sodium sulfite solutions using 0.1 mol l-1 lead nitrate solution as the titrant.
Abstract: A novel potentiometric titration procedure has been developed for the determination of sodium sulfate impurity in sodium sulfite solutions using 0.1 mol l–1 lead nitrate solution as the titrant. Sodium sulfite was effectively removed by reaction with formaldehyde solution, leaving only sulfate to react quantitavely with the standard 0.1 mol l–1 lead nitrate solution. Commercially available sodium sulfite solutions are manufactured to contain 18–20% m/m Na2SO3 and during method development the lowest level of sodium sulfate impurity measured was 0.3% m/m in a laboratory-prepared 18% m/m sodium sulfite solution. The potentiometric titration results agreed closely with those of a traditional gravimetric procedure, with no difference when the sodium sulfate level was 2.5% m/m and only 0.3% m/m maximum difference in absolute terms, when the sodium sulfate level was at 9% m/m. At low concentrations of sodium sulfite (i.e., about 0.2% m/m) the detection limit for the sodium sulfate impurity is 0.02% m/m.
TL;DR: In this article, the separation of gold from its hydrochloric solution with the liquid surfactant membranes was studied by using polyamine E644 as the surfactants, N5O3, DBC or DIBK as the carrier and sodium sulfite or oxalic acid as the internal reagent.
Abstract: The separation of gold from its hydrochloric solution with the liquid surfactant membranes was studied by using polyamine E644 as the surfactant, N5O3, DBC or DIBK as the carrier and sodium sulfite or oxalic acid as the internal reagent. Results show that all the carriers can be used to extract the gold effectively, while N5O3 gives the best results. When sodium sulfite was used as the internal reagent, the extraction rate was much faster than when oxalic acid was used. The extraction rate increases with the decrease in PH in the external phase. Finally, the diffusion-reaction model for Type II Facilitated transport in the liquid surfactant membranes was tested by the experimental data.