Showing papers on "Sodium sulfite published in 1987"

The roles of pH and ionic species in sulfur dioxide- and sulfite-induced bronchoconstriction.

Abstract: Sulfur dioxide (SO2) and sulfites are well-described causes of bronchoconstriction in persons with asthma that are chemically related and, therefore, may share a common mechanism of action. When either sulfur species dissolves in aqueous solutions, a pH-dependent equilibrium is established predominantly among bisulfite ion (HSO3-), sulfite ion (SO3=), and SO2. In addition, hydrogen ions may be released. To assess the relative bronchoconstricting potencies of these chemical forms and the role of acidity caused by the release of hydrogen ions in SO2- and sulfite-induced bronchoconstriction, we administered to 10 asthmatic subjects nebulized sodium sulfite (Na2SO3) solutions at pH 9 containing 95% sulfite, at pH 6.6 containing 80% bisulfite, and at pH 4 containing 99% bisulfite but greater than an order of magnitude more SO2 than the pH 6.6 solutions. Subjects inhaled increasing concentrations of aerosolized Na2SO3 at each pH during 1 min of tidal breathing. Subjects also breathed buffered acetic acid aerosols with the same acidity of the pH 4 Na2SO3 solutions to control for the airway effects of acid aerosols. To assess sensitivity to SO2 gas, subjects inhaled increasing concentrations of SO2 during eucapneic hyperpnea. Bronchoconstrictor response was assessed by measuring specific airway resistance (SRaw) before and after each challenge. Nine of the 10 subjects developed bronchoconstriction after inhaling the Na2SO3 aerosols at all 3 levels of pH and the SO2 gas. The mean concentration of Na2SO3 solution calculated to increase SRaw by 100% above baseline was significantly different (p less than 0.01) at the various levels of pH: pH 4 (0.17 mg/ml) less than pH 6.6 (0.49 mg/ml) less than pH 9 (2.10 mg/ml).(ABSTRACT TRUNCATED AT 250 WORDS)

Absorption of dilute nitric oxide into aqueous solutions of sodium sulfite with added iron(II)NTA and reduction kinetics of iron(III)NTA by sodium sulfite

Abstract: Etude de l'absorption de NO a 323 K, et des reactions chimiques accompagnant cette absorption. La vitesse de reduction est du 1er ordre

Kinetics of the oxygen-sulfite reaction at waterflood concentrations: effect of catalysts and seawater medium

Abstract: Cas de la reaction du sulfite de sodium et du bisulfite d'ammonium avec O 2 , reaction catalysee par Co 2+ , Cu 2+ , Ce 4+ , Mn 2+ . Les ions Ni 2+ , Fe 2+ et Fe 3+ sont inactifs

Water-absorptive composition

Abstract: PURPOSE: To obtain the titled composition of high water absorptivity, giving outstanding gel stability for body fluids such as urine and secretory fluids, free from any problem on safety and health aspects, by incorporating a water- absorptive resin with an oxygen-contg. reducing inorganic salt. CONSTITUTION: The objective composition can be obtained by incorporating (A) 100pts. by. wt. of a water-absorptive resin (e.g., an acrylic acid salt polymer crosslinked product) with (B) pref. 0.01W5pts. by wt. of an oxygen-contg. reducing inorg-anic salt (pref. sodium sulfite). For accomplishing sufficient gel stability for aqueous electrolyte solution as well as for body fluids, an organic antioxidant is to be further incorporated in the component A. COPYRIGHT: (C)1988,JPO&Japio

Influence of Uric Acid on Photostability of Sulfathiazole Sodium Solutions

Abstract: The effect of uric acid as a photoprotective agent for buffered and unbuffered solutions of sulfathiazole sodium was investigated. Uric acid solution in glycerin was found to enhance the photostability of sulfathiazole sodium solutions. The higher the concentration of uric acid used, the greater was its photoprotective action within the concentration range studied. Uric acid was also found to demonstrate its photoprotective effect in the presence of either sodium sulfite or EDTA. Sodium sulfite alone in a concentration of 0.1% produced a detrimental effect on the photostability of sulfathiazole sodium in either borate or phosphate buffer of pH 9 ± 0.2. From the standpoint of the overall chemical stability of sodium sulfathiazole, uric acid appeared to be most effective when used alone in the borate buffer. However, the incorporation of 0.1% sodium sulfite in addition to uric acid contributed to the prevention of discoloration in either the borate or the phosphate buffer.

Sodium-limestone double alkali flue gas desulfurization process with improved limestone utilization

Abstract: A method for improving utilization of limestone in a sodium-limestone double alkali flue gas desulfuriza­tion process. Spent alkaline absorber solution, con­taining sodium sulfite and sodium bisulfite, is diverted for regeneration treatment in a series of stirred tank reactors, where it is contacted with the limestone regenerating agent. Dilute slurry from the last reactor is concentrated in a thickener, and the concentrated underflow slurry from the thickener is then treated further in an after-reactor circuit. Since the thickener underflow slurry contains residual unreacted limestone, the slurry is contacted with a side stream of spent alkaline absorber solution in the after-reactor circuit to promote further reaction of residual limestone before the solids are separated and discarded.

Determination of glucose in biospecimen

Abstract: PURPOSE: To determine the quantity of glucose from the determined quantity of hydrogen peroxide produced by enzymatic decomposition of glucose in a specimen using a calibration curve, by treating a biospecimen with an anion exchange resin and then with a reducing agent prior to the enzymatic treatment and decomposing existing hydrogen peroxide in the presence of a catalyst CONSTITUTION: A specimen such as urine, blood, serum, plasma, lymph, saliva and gastric juice is treated with a strongly basic anion exchange resin (OH - -type resin) having particle size of 100W200 mesh and then with a reducing agent such as sodium borohydride or sodium sulfite to effect the reduction and decomposition of the hydrogen peroxide existing in the treated specimen The glucose in the specimen is oxidized and decomposed with a glucose oxidase to produce hydrogen peroxide The hydrogen peroxide is determined by the measurement of chemiluminescence emitted by the addition of luminol and potassium ferricyanide or chemical or physical methods and the glucose concentration in the specimen is determined from the amount of hydrogen peroxide based on a calibration curve COPYRIGHT: (C)1988,JPO&Japio

Hair treatment preparations

Abstract: OF THE DISCLOSURE Aqueous hair treatment preparations containing as anionic surfac-tant an alkylether sulfonate corresponding to the following formula R1-O-(CnH2nO)X-(CH2)y-SO3(-)M(+) in which R1 is a C8-C19 alkyl group, n = 2 or 3, x = O to 20, y = 1 to 3 and M(+) is an alkali metal ion. Alkylether sulfonates such as these show high foaming power, are easy to thicken and are stable to hydroly-sis in acidic medium. They can be prepared by reaction of correspond-ing alkylether sulfates with sodium sulfite in aqueous solution and extraction from the reaction mixture with a saturated C4-C6 alcohol.

High-density particulate concentrated detergent composition

Abstract: PURPOSE:To provide the title compsn. which is excellent in dispersion and solubility and fluidity during long-term storage, and which comprises an anionic surfactant, a particular polyoxyethylene alkyl ether, zeolite, sodium silicate, and sodium sulfite. CONSTITUTION:30-60wt.% (hereinafter merely '%') anionic surfactant () (e.g., sodium alkylbenzenesulfonate) is mixed with 1-5% nonionic surfactant composed of polyoxyethylene (average degree of polymerization=7-20) alkyl (average C number=10-20) ether (b), 10-30% type A zeolite (c), 10-25% No.1-3 sodium silicate (d), 0.5-3% sodium sulfite (e), and optional additives (f) such as water, builders, breaching agents, enzymes, fluorescent dyes, and perfumes.

Method for dissolving iron component in aqueous solution containing colloidal iron component

Abstract: PURPOSE:To dissolve a colloidal or particulate iron component in an ionic state within a short time, by adding hydrochloric acid and sulfite to a specimen aqueous solution collected from a colloidal iron component-containing aqueous solution before heating said specimen solution. CONSTITUTION:A specimen water inlet valve 2, a water feed pump 3 and a flowmeter 4 are connected to a specimen water introducing pipe 1. Further, a sodium sulfite injection pump 5 is connected to said introducing pipe 1 through a sodium sulfite injection pipe 6 and a sodium sulfite injection valve 7, and a hydrochloric acid injection pump 8 is connected thereto through a hydrochloric acid injection pipe 9 and a hydrochloric acid injection valve 10. The whole is connected to a specimen water heater 11 and subsequently connected to a cooler 2 and pressure is reduced through a pressure control valve 13 to feed water to a total iron analyzer 15. By this constitution, a colloidal or particulate iron component can be dissolved within a short time and a required analytical time can be shortened.

Fluorometric Determination of Aromatic Aldehydes with 1, 4-Dimethyl-3-carbamoylpyridinium Chloride

Abstract: 1, 4-Dimethyl-3-carbamoylpyridinium chloride (DCP•Cl) has been synthesized as a new fluorogenic reagent for aromatic aldehydes. Aldehydes gave a green fluorescence (λex420-439nm and λem504-519nm) after reaction with DCP•Cl at 37°C for 50min in the presence of alkali and sodium sulfite. The method is simple and sensitive for aromatic aldehydes except for those having hydroxy or dimethylamino group. Aliphatic and arylaliphatic aldehydes and substances other than aldehydes showed no or weak fluorescence. By the proposed method, benzaldehyde, furfural and 4-methoxybenzaldehyde could be determined in the ranges 0.06-3nmol/ml, 0.08- 3nmol/ml and 0.3-6nmol/ml, respectively, with relative standard deviations of 0.5-2.5%.

Supported Sulfide and Sulfur Oxy-Acid Salts. Involvement of Alumina-Induced Cannizzaro Reaction in the Reported Reduction of Aldehydes by Na2S/Alumina

Abstract: Cannizzaro type oxidation-reduction of aromatic and aliphatic aldehydes, promoted by alumina, was observed during study of inorganic-solid-supported sodium sulfide and sulfur oxy-acid salts.

Production of sodium sulfite

Abstract: PURPOSE:To produce the sodium sulfite which does not decrease purity, and suppresses color by absorping a SO2 gas contd. in an exhaust gas with an aqueous solution of NaOH contg. a salt of gluconic acid followed by depositing the Na2SO3, and then separating it. CONSTITUTION:The SO2 gas contd. in the exhaust gas which generates in a metal refining, a petroleum refining and a boiler, etc., contacts with the aqueous NaOH solution contg. 10-5,000ppm the salt of gluconic acid such as a potassium gluconate, and then absorbs and reacts to form an aqueous solution of acid sodium sulfite. And then, the obtd. aqueous solution is neutralized with NaOH and Na2 CO3, etc., followed by depositing a crystal of Na2SO3 and separating and drying it. Thus, as an impurity of a metal ion contd. in the aqueous solution of the acid sodium sulfite makes it soluble in the aqueous solution with the gluconate, the impurity does not take in the crystal of the Na2SO3, thereby obtaining the white crystal of Na2SO3 having a high purity.

Decomposition of lactose

Abstract: PURPOSE: To easily obtain decomposition product of lactose useful in food processing field, etc., by reacting an immobilized lactase and sulfurous acid salts in a lactose-containing liquid. CONSTITUTION: A heat-resistant lactase originated from Bacillus stearo- thermophilus is introduced into a microbial cell. Lactase produced by the microbial cell is adsorbed to an insoluble carrier in a buffer liquid and immobilized by reacting with glutaraldehyde to obtain an immobilized lactase (A). Separately, (B) a solution containing about 2wt.% of lactose is mixed with (C) 0.4W8.0mM of sulfurous acid salts (e.g. sodium sulfite) to obtain (D) a lactose solution containing sulfurous acid salts. The solution D is added to the component A and the lactose is decomposed into glucose by enzymatic reaction. COPYRIGHT: (C)1988,JPO&Japio

Kinetics of iron(III) EDTA reduction by sodium sulfite

Abstract: La reaction est du 1er ordre par rapport a SO 3 2− et Fe III EDTA − et inferieure a l'ordre 1 par rapport a Fe II EDTA 2−

Paired Electrolysis of Aldoses in a Divided Flow Cell

Abstract: Simultaneous anodic oxidation and cathodic reduction of aldoses in a divided flow cell were studied. The stream of the anolyte was an aqueous solution containing D-glucose, sodium bromide, and sodium bicarbonate. The stream of the catholyte was also an aqueous solution containing xylose and sodium sulfite. The factors which affected both the anodic and cathodic reactions were studied. The results indicate that the flow rates and temperatures of the anolyte and the catholyte, concentrations of the aldoses, pH values and the material of electrodes significantly affect both anodic and cathodic yields. The selectivities of gluconic acid in the anode and xylitol in the cathode were very high. The power consumption of paired electrolysis in the flow system was less than paired electrolysis in a batch system.

Stabilizing solution substituting washing water and method for processing silver halide color photographic sensitive material using same

Abstract: PURPOSE:To prevent generation of a precipitate in the title solution and a stain by incorporating a compd. capable of releasing a sulfite ion, and a specific triazole compd. to the titled solution which is used for washing the photosensitive material, after developing and fixing the photosensitive material. CONSTITUTION:The photosensitive material is color-developed and is treated with a solution having a fixing ability, followed by washing the photosensitive material with the titled solution. The titled solution contains the compd. capable of releasing the sulfite ion, for example, sodium sulfite and ammonium sulfite, etc., and also contains at least one of the compds. shown by formulas I and II, wherein R1 is H or 1-4C alkyl group, R2 is halogen, alkyl, nitro, sulfonic acid, amino, carboxylic acid or alkyloxycarbonyl group, R3, R4, R5 and R6 are each H or alkyl group, X is an acidic compd., (n) is 1 or 0. The titled solution is used at a pH of 5-10. Thus, the generation of the precipitate is prevented in the title solution and the stain of the sensitive material due to an adhesion of the precipitate is prevented, even if the titled solution is stored on standing.

Sodium Sulfite-Formaldehyde-Quinone Cooking of Softwood

Abstract: A new cooking process with sodium sulfite, formaldehyde, and a quinone compound (1, 4-dihydro-9, 10-dihydroxyanthracene sodium salt: DDA) was devised in order to produce soft wood semichemical and chemical pulps which are superior to neutral sulfite and kraft pulps, respectively. In this studies, this process was evaluated in terms of the optimum compositions of cooking liqnor, delignification selectivity, and pulp qualities.The results were as follows:(1) The addition of formaldehyde to a sodium sulfite-DDA solution accelerates delignification of yezo spruce. The optimum molar ratio of formaldehyde to sodium sulfite for delignification is in the range of 0.15-0.70.(2) Delignification selectivity in sodium sulfite-formaldehyde-DDA cooking is better than that in neutral (weakly alkaline) sulfite-DDA cooking. Lignin-free yields by the former cooking are 2-5% higher than those by the latter at a given delignification.(3) Delignification rate of yezo spruce in this cooking is comparable to that in kraft-DDA cooking, when the dose of DDA is increased to 0.5% on o.d. wood. Lignin-free yields by the former are 9-10% higher than those by the latter at a given delignification.(4) Yezo spruce/saghalien fir pulp produced by this cooking has higher tensile and burst indices, and higher brightness than kraft-DDA pulp.

Strength and optical properties of chemically pretreated aspen chip groundwood

Abstract: Etude des proprietes d'une pâte mecanique de tremble pretraitee par la soude froide, le sulfite neutre et le bisulfite de sodium

Silver complex salt diffusion transfer method for reproducting continuous gradation

Abstract: PURPOSE:To improve tone and gradation by incorporating specified amounts of an aqueous sulfite, an aqueous thiosulfate and an aminoalcohol compd into a diffusion transfer processing solution, respectively CONSTITUTION:The diffusion transfer processing solution contains 035-05mol/l of the aqueous sulfite, 005-02mol/l of the aqueous thiosulfate and 01-035mol/l of the aminoalcohol compd The usable aqueous sulfite is exemplified by sodium sulfite, potassium sulfite and ammonium sulfite, etc, and the usable aqueous thiosulfate is exemplified by sodium thiosulfate, potassium thiosulfate and ammonium thiosulfate, etc, and, the aminoalcohol compd used for the silver complex salt diffusion transfer processing solution is exemplified by a primary, a secondary and a tertially amine compds having at least one of a hydroxyalkyl group, and preferably the secondary and the tertary amino alcohols thus, the tone and the gradation are improved

Removal of sulfate from reaction mixture liquid of photosulfoxidation of paraffin

Abstract: PURPOSE:To efficiently remove a sulfate from a reaction mixture liquid, by conducting solid-liquid separation of the reaction mixture liquid of a photosulfoxidation reaction in a substantially anhydrous reaction system after adding a slurry aqueous solution of sodium sulfite thereto. CONSTITUTION:To a reaction mixture liquid obtained by subjecting a paraffin to photosulfoxidation reaction while in contact with sodium sulfite in a substantially anhydrous reaction system, is added a saturated aqueous solution of sodium sulfate or a slurry aqueous solution of sodium sulfate, and the resultant mixture is subjected to solid-liquid separation to remove sulfate from the reaction liquid. Accordingly to the solid-liquid separation, coagulation and crystal growth of sulfate particles can be carried out and sticking of particles can be prevented. Clogging of filter cloth scarcely occurs, and consequently, a high filtration velocity can be continuously attained. Efficient removal of sulfate can be achieved without leaking a large amount of the sulfate into the separated filtrate.

Modified Method for the Determination of Amino Groups by Sodium 2, 4, 6-Trinitrobenzenesulfonate

Abstract: The reactions of amino groups in amino acids and proteins with sodium 2, 4, 6-trinitrobenzenesulfonate (TNBS·Na) in the presence of sodium sulfite (Na2SO3) were studied at pH 10.1. Determination of the amino groups was performed by following the absorbance A (420 nm) of the Meisenheimer complex. A good linear relationship between A and the concentrations of amino compounds was observed. The reactions in a cuvette showed good agreement with those in the dark. Based on these observations, a modified method for determining amino groups by TNBS·Na in the presence of Na2SO3 is proposed, and several comments are described.

Treatment of iron oxide with sulfuric acid

Abstract: PURPOSE:To obtain soln. of ferric sulfate having high concentration useful as material for iron base coagulant by realizing easy dissolution of iron oxide with is hardly soluble in H2SO4 by executing the dissolution by adding H2SO4 and a reducing agent to iron oxide consisting of Fe(II) and Fe(III) in a specified molar ratio. CONSTITUTION:Above 3 mole 30-50% H2SO4 and a reducing agent such as hydroxylamine hydrochloride, oxalic acid, sodium sulfite, gaseous H2 corresponding to 1/10-1/2 moles of Fe2O3 in 1mol iron oxide comprising below 1/2 molar ratio of Fe(II) to Fe(III), namely Fe3O4, or iron oxide contg. less Fe(II) than the above described iron oxide are admixed and said iron oxide is dissolved at >=75 deg.C.

Method for purifying by-product glauber salt from stack-gas desulfurization

Abstract: PURPOSE:To efficiently remove impurities contg. harmful heavy metal salts from a Glauber wsalt soln. by adding sulfuric acid, ferrous sulfate, sodium sulfate, sodium hydroxide and calcium hydroxide to a by-product Glauber salt soln. in specified order and amt. CONSTITUTION:Sulfuric acid is added to a soln. of by-product Glauber salt which is generated from the stack-gas desulfurization in a glass manufacturing works, etc., and the pH of the soln. is regulated to <=3. Ferrous sulfate, expressed in terms of iron ions, in the weight 10-30 times the total of the ions of selenium, arsenic, chromium, lead and vanadium contained in the soln. and sodium sulfite, expressed in terms of sulfite ions, in the weight 5-20 times the total are added and sodium hydroxide is added to control the pH of the soln. to about 7. Then calcium hydroxide, expressed in terms of calcium ions, in the weight 5-20 times the fluorine ions contained as impurities is further added. Then sodium hydroxide is added to adjust the pH of the soln. to 9.5-11 and the metals are flocculated and deposited along with the hydroxides of iron. Then solid is separated from liq.