— BACKGROUND. The SO 2 and NO emitted from coal-fired power plants have caused serious air pollution in China. Fe II EDTA complexation technology is one of the most promising processes to realize the simultaneous removal of SO 2 and NO. However, Fe II EDTA is easily oxidized to Fe III EDTA, causing loss of activity, which …

 — cess, sodium dithionite is the preferred reducing agent because of its low cost and short reduction time6,7. However, sodium dithionite decomposes to form sulfate and sulfite, which can corrode equip-

 — Large amounts of chromite ore processing residue (COPR) wastes have been deposited in many countries worldwide, generating significant contamination issues from the highly mobile and toxic hexavalent chromium species (Cr(VI)). In this study, sodium dithionite (Na 2 S 2 O 4) was used to reduce Cr(VI) to Cr(III) in COPR containing …

 — The leaching behavior of manganese from ferruginous manganese ore in sulphuric acid solution using sodium dithionite as a reducing agent was investigated. The optimum sulphuric acid concentration, leaching time, temperature, pulp density and agitation speed for leaching of manganese was determined. Complete manganese …

 — Sodium dithionite (Na 2 S 2 O 4) is used in dye bath for indigo blue extraction, but this reducing agent and its derivatives are major pollutants of textile …

sodium dithionite to a resin bed :- n The sodium dithionite shouldbe added to water (and not the reverse) so as to form a 4% solution. n Caution should be shown when mixing the sodium dithionite because strong fumes of an obnoxious nature are evolved during the mixing process. Sufficient solution should be so thatwhen applied to the resin bed ...

 — We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of Cr(VI) in chromite ore processing solid waste (COPSW) derived from the production of ferrochrome alloy. The COPSW is characterized by high pH (8.5-11.5) and high Cr(VI) concentrations in the sol …

Patent EPB1 A method for producing sodium ... A method for producing sodium dithionite ... comprising an odorous gas incineration plant 2 and a gas scrubber 3 for processing flue gases developed in the combustion .....

ESSENTIALS FOR HYDROSULFITE BLEACHING Pulp and bleach solution must be oxygen-free Careful pH control of pulp and bleaching solution, must avoid pHs below 5 …

 — Various chemicals and techniques have been employed for the indigo reduction process. Sodium dithionite (hydrosulfite: Na 2 S 2 O 4) is the most common …

 — Other much less frequently used solution methods are based on the application of hydrazine or sodium dithionite as the reducing agent instead of NaBH 4, or …

 — The protein was extracted from the leaf powders by addition of 2–3× (V/W) of the extraction buffer (20 mM sodium phosphate buffer pH 6.3, 5 mM dithiorethiol (DTT), 5% W/V ...

plant. 2.3 Hazards not otherwise classified (HNOC) or not covered by GHS ... Synonyms : Sodium hypodisulfite Formula : Na 2 O 4 S 2 Molecular weight : 174.11 g/mol CAS-No. : 7775-14-6 EC-No. : 231-890-0 Index-No. : 016-028-00-1 Component Classification Concentration sodium dithionite 1; Acute Tox. 4; Eye Irrit. 2A; Aquatic Acute 3; <= 100 % ...

 — Based on the reduction of azobenzene by dithionite, probes NS-1 and NS-2 were developed which could respond to dithionite selectively and the limits of detection (LODs) were 0.51 μM and 1.02 μM, respectively, but the time required to complete the response process was as long as 10 min (Dong, Song, Kong, Zhang, & Lin, 2019).

 — Visit ChemicalBook To find more Sodium dithionite(7775-14-6) information like chemical properties,Structure,melting point,boiling point,density,molecular formula,molecular weight, physical properties,toxicity information,customs codes. You can also browse global suppliers,vendor,prices,Price,manufacturers of Sodium …

Sodium dithionite (also called sodium hydrosulfite) reduces the diazo linkage, breaking the bond between the nitrogens and leaving a primary amine on both fragments of the crosslinker (Figure 9.3). The reaction is usually carried out in alkaline conditions; a 25-min incubation with 0.1- M dithionite in 0.2- M sodium borate, pH 9, works well.

 — The first indigo vats that I made in the 1970's were reduced using sodium hydrosulfite. It was the only way I then knew to reduce the …

 — The first two batches were prepared at approximately 0.5 M sodium dithionite, 0.65 M sodium sulfite, and 0.24 M sodium sulfide, which was expected to result in a dithionite injection concentration of about 0.05 M after the 1:10 dilution in the injection plumbing, thus roughly matching the injection concentration in the single-well dithionite …

 — A reducing agent is used in indigo dyeing to convert an indigo pigment to a water-soluble leuco form prior to its application on cellulosic fibers. Sodium dithionite (Na 2 S 2 O 4), the most widely used reducing agent for industrial indigo dyeing, is considered environmentally unfavorable because sulfite and sulfate generated in the dyebath can …

The reduction with sodium dithionite leads to the formation of substantial quantities of waste water and thus led to the development of alternative reduction methods, such as the reduction with ...

processing residue by sodium dithionite and sodium phosphate addition and its mechanism Yunyi Li a, b, Andrew. B. Cundy b, Jingxuan Feng c, Hang Fu a, Xiaojing Wang, Yangsheng Liu a aCollege of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, 100871, P. R. China

 — Paraquat acts rapidly and in a non-specific manner on plant tissues and destroys them. Paraquat was first produced commercially during the 1960s and in India, it is available as a dichloride salt under the trade names Gramoxone and Weedol. ... The sodium dithionite test can detect paraquat up to a concentration of 1 μg/mL in a clear …

Sodium dithionite mediated one-pot, ... a Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India E-mail: [email protected]. Abstract. A chemoselective reduction of a nitro group in the presence of an aldehyde or ester group integrated with ...

 — Normalised residual xanthate concentration in solution after decomposition in 500 mg/L dithionite solution at pH 3, 5, 7, 9, 11. ΔpH was monitored at pH 5 and 7, where there was a significant ...

 — Remediation of hexavalent chromium contamination in chromite ore processing residue by sodium dithionite and sodium phosphate addition and its mechanism. Author links open ... Henan province, China (34.796 N, 111.877 E), where the Zhenxing Chemical Plant was previously located. Information on analytical methods used for …

Full Article. Thermal and Alkali Stability of Sodium Dithionite Studied Using ATR-FTIR Spectroscopy. Vijaya Lakshmi Veguta, a,b Jasna S. Stevanic, b Mikael Lindström, a and Lennart Salmén b, * Sodium dithionite (Na 2 S 2 O 4) may have the potential to be used as a reducing agent for the stabilization of glucomannan in kraft cooking for increased pulp …

processing in the textile industry has recently increased because of a larger awareness of environmental issues. For the case of indigo dyeing process, the reducing agent conventionally used is the - environmentally unfavourable – sodium dithionite, which will be replaced in this study with an ecological reducing agent called

Sodium dithionite, Na_{2}S_{2}O_{4}, is an important reducing agent. One interesting use is the reduction of chromate ion to insoluble chromium(III) hydroxide by dithionite ion, S_{2}O_{4}^{2−}, in basic solution. Sulfite ion is another product. The chromate ion may be present in wastewater from a chromium-plating plant, for example.

Sodium dithionite is a reducing agent used in the reduction of textile dyes during dyeing processes. It helps to make these dyes soluble in water, ensuring the quality and reproducibility of the dyed textile product. ... New process of indigo reduction using NADH dependent reductases from Bacillus subtilis in the presence of redox mediators is ...

 — A reducing agent is used in indigo dyeing to convert an indigo pigment to a water-soluble leuco form prior to its application on cellulosic fibers. Sodium dithionite …