Sodium sulfite

About: Sodium sulfite is a research topic. Over the lifetime, 2548 publications have been published within this topic receiving 18523 citations. The topic is also known as: Na2SO3 & Anhydrous sodium sulfite.

Process for determining vanadium content in desulfurizing liquid

Abstract: The invention relates to a method for detecting the vanadium content of desulfurized liquid, belonging to the technique of gas desulfurize purification, which can use light split photometric method to measure the vanadium content of desulfurized liquid. It is characterized in that: it uses light split photometric method to measure the vanadium content of desulfurized liquid, while needing the raw materials as: sodium acetate, tannic acid, vitriol, sodium sulfite, and sodium metavanadate standard solution, and the needd devices comprise: spectrophotometer. The inventive method is simple which only adds one spectrophotometer, and adjusts the wavelength to 590nm, and adjust other parameters as pH valve according to the actual condition, then dilutes the desulfurize solution, draws the standard curve to make regress equation, marks the light adsorption degrees of unknown desulfurize solution, and find the vanadium content according to the standard curve. The invention has high accuracy, 100% recycled rate, and 1% relative error.

Evaluation of sodium sulfite and protein correction in analyses of fibrous compounds in tropical forages

Abstract: The objective of this study was to evaluate the contents of fibrous compounds in tropical grasses and legumes according to utilization of sodium sulfite in the neutral detergent solution or using a procedure for contaminant protein correction. Samples of ten grasses and ten legumes were used. The contents of neutral detergent fiber were decreased when sodium sulfite was used; however, more prominent reductions were verified in legumes. Sodium sulfite decreased the acid detergent fiber content in both forage groups. The contents of neutral and acid detergent insoluble protein and lignin were reduced by sodium sulfite in legumes, but no effect was observed in grasses with regard to these variables. The decrease in fiber contents in legumes could be explained by the solubilization of lignin and decrease in insoluble nitrogen. However, the decreases in fiber in grasses could not be solely explained by the decrease in contaminant protein and solubilization of lignin, and loss of other fibrous compounds probably occurred. The utilization of sodium sulfite compromises the accuracy of the estimates of fibrous compounds contents in tropical forages. The precision of the estimates were not relevantly increased by sodium sulfite. The correction of insoluble fibrous compounds for protein is suggested instead of using sodium sulfite because there are no modifications on neutral detergent solution or undesirable solubilization of fibrous compounds.

Purification of 2,4,6-trinitrotoluene by digestion with sodium sulfite and determination of its impurities by gas chromatography–electron capture detector (GC-ECD)

Abstract: Unwanted compounds in 2,4,6-trinitrotoluene (TNT) explosive, such as dinitrotoluene (DNT) and TNT isomers, can lead to exudation defects in the ammunition. For this reason, separation and analysis of impurities are valuable. Chemical treatment with sulfite solution is an important method for the purification of TNT. In this paper, TNT was purified by sodium sulfite solution with putting flaked TNT in digestion condition to remove existing impurities, and the effect of four main factors, digestion temperature, digestion time, concentration of sulfite solution and reaction time of sulfite with impurities on this purification process, was statistically investigated and optimized using central composite design of experiment (CCD) by Minitab software. Also, the qualification of final product was characterized by gas chromatography–electron capture detector method. Here, some conventional compounds such as 2,6-DNT, 2,4-DNT, 3,4-DNT, 2,4,5-TNT (γ-TNT), 2,3,4-TNT (β-TNT) and aniline derivatives were identified by standard solutions; then their concentrations were quantitatively determined by internal standard calibration method.

Effects of incubation time and sodium sulfite upon in-vitro digestibility estimates and sample filtering time.

Abstract: We conducted 2 experiments to quantify the effects of incubation time, filtering method, forage type, and associated interactions on the precision and accuracy of in-vitro digestibility as estimates of in-vivo digestibility. Experiment I used 10 incubation times and alfalfa (Medicago sativa L.), kleingrass (Panicum coloratum L.), prairie grass, and wheat straw (Triticum aestivum L.) hays to determine whether a single incubation time should be employed to estimate digestibility of a variety of forages. Additionally, 2 second stage neutral detergent extraction methods were evaluated to determine sodium sulfite effect on fiber recovery and filter time. An interaction existed between incubation time and in-vitro estimates of digestibility. The use of sodium sulfite increased (P<0.05) digestibility estimates (1.3 units) across all hays and decreased filtering times by as much as 9.5 min/sample. Experiment II utilized 3 hays (alfalfa, kleingrass, and wheat straw), 4 incubation times and 4 neutral detergent extraction methods in an effort to isolate where the changes in neutral detergent fiber (NDF) estimates due to sodium sulfite occurred and if a method could be developed to maximize filtering speed without compromising the accuracy of digestibility estimates. Use of sodium sulfite in the rinse water did not affect apparent NDF recovery and decreased filtering time by approximately 10 min. when compared to no sulfite additions. Results of this study confirm previous observations that a single incubation period should not be used to estimate in-vivo digestibility. Addition of sodium sulfite to the rinse water provides a viable means to decrease sample analysis time without jeopardizing the accuracy of digestible NDF estimates.