scholarly journals Development of Technology of Arsenic Removal from Acidic Waste Solutions in the Form of Arsenic Trisulfide

2020 ◽  
Author(s):  
Anna A. Grebneva ◽  
Irina L. Subbotina ◽  
Konstantin L. Timofeev ◽  
Gennady I. Maltsev
Keyword(s):  
Arsenic Removal ◽  
Sodium Sulfide ◽  
Dry Weight ◽  
Metallurgical Enterprise ◽  
Arsenic Trisulfide ◽  
Mechanical Stirring ◽  
Keywords Arsenic ◽  
Trivalent State ◽  
Sodium Sulfide Solution ◽  
Sulfide Solution

During the laboratory tests the conditions of arsenic removal from acidic waste solutions of metallurgical enterprise in the form of arsenic trisulfide were determined. The technology based on the reduction of pentavalent arsenic to trivalent state with sodium pyrosulfite solution and following arsenic trisulfide precipitation from acidic solution after treatment with sodium sulfide solution was proposed. The arsenic removal proceeds with mechanical stirring, dosing the calculated amounts of reagents and collecting emissions of hydrogen sulfide. With such treatment, about 95% of arsenic, which was in the initial solution, passes into the precipitate. An enlarged laboratory experiment was carried out and the precipitate with 42.6% of arsenic and 46.9% of sulfur was obtained. The precipitate yield was ∼25.7 kg (dry weight) out of 1 m3 of the initial arsenic containing solution. Keywords: arsenic, arsenic trisulfide, acidic waste solutions, sodium sulfide, sodium pyrosulfite

Spot Test for Lead in Paint (Continued)

PEDIATRICS ◽  
1971 ◽  
Vol 48 (2) ◽  
pp. 330-330
Author(s):  
James W. Sayre
Keyword(s):  
Hydrogen Sulfide ◽  
Sodium Sulfide ◽  
Spot Test ◽  
Sodium Sulfide Solution ◽  
The Stability ◽  
Sulfide Solution

Questions asked by several people about our sodium sulfide testing of paint for lead1 make us feel we might wisely add several words of caution about the stability of the prepared solution. Sodium sulfide solutions deteriorate fairly rapidly with age, especially on exposure to air. For this reason, it is suggested that people using the procedure check the odor of the sodium sulfide solution tlley are using, to make sure the odor of hydrogen sulfide is detectable.

scholarly journals A perfusion-fixation procedure for the concurrent demonstration of Timm's, horseradish peroxidase (HRP), and acethycholinesterase (AChE) histochemistry.

1984 ◽  
Vol 32 (10) ◽  
pp. 1113-1116 ◽  
Author(s):  
M B Moss ◽  
D L Rosene
Keyword(s):  
Horseradish Peroxidase ◽  
Sodium Sulfide ◽  
Prolonged Exposure ◽  
Initial Exposure ◽  
Sodium Sulfide Solution ◽  
Acetylcholinesterase Histochemistry ◽  
The Central Nervous System ◽  
Fixation Protocol ◽  
Perfusion Fixation ◽  
Sulfide Solution

The sulfide-silver method of Timm has been a widely used histochemical technique to demonstrate the presence of heavy metals in biological tissue, particularly in the central nervous system. However, the use of this method or its several modifications results in less than optimal morphological preservation and requires embedding the tissue in paraffin or freezing it and cutting it directly onto slides with a cryostat. These procedures can decrease the sensitivity and limit the application of other histochemical procedures, particularly when experiments necessitate processing large specimens or reaction procedures require techniques using free-floating sections. A perfusion-fixation protocol is described that yields sufficient fixation to cut whole frozen blocks of tissue with a sliding microtome, permits the use of free-floating sections, and allows the concurrent demonstration of horseradish peroxidase and acetylcholinesterase histochemistry without loss of sensitivity. The method consists of a short initial exposure to a sodium sulfide solution followed by a prolonged exposure to a combined sulfide-aldehyde fixative solution.

Clean Energy Generation by a Nanostructured Biophotofuel Cell

2013 ◽  
Author(s):  
Xiaolu Liu ◽  
Yang Liu ◽  
Kai Ren ◽  
Paul Lawson ◽  
Andrew Moening ◽  
...  
Keyword(s):  
Visible Light ◽  
Ultraviolet Light ◽  
Sodium Sulfide ◽  
Clean Energy ◽  
Energy Generation ◽  
Tio2 Nanotube ◽  
Light Illumination ◽  
Photoelectrochemical Response ◽  
Sodium Sulfide Solution ◽  
Sulfide Solution

In this paper, clean energy generation from hazardous materials by a nanostructured biophotofuel cell was studied. Specifically, electrodeposition of polyaniline on TiO2 nanotube as photoelectrochemical anode for a sodium sulfide fuel cell was performed. The photoelectrochemical response of the TiO2 nanotube capped by polyaniline nanoparticles was studied in UV and visible light illumination using sodium sulfide as the electrolyte. The polyaniline was added onto the top end of the nanotube via electrochemical deposition from 0.1 M aniline (C6H7N) in 1 M HCl solution. Polyaniline nanoparticle/TiO2 nanotube was made into an anode and put into 0.5 M sodium sulfide solution for photoelectrochemical response tests under both visible and ultraviolet light irradiation. The photoelectrochemical anode shows good photo-catalytic property, as evidenced by the open circuit potential changes when the illumination conditions were changed. Its response to ultraviolet light is much stronger than to visible light. It is also found that the higher the temperature of the sodium sulfide solution, the weaker the photo-catalytic response of the anode.

InP(1 0 0) surface passivation with aqueous sodium sulfide solution

2020 ◽  
Vol 533 ◽  
pp. 147484
Author(s):  
Mikhail V. Lebedev ◽  
Yuriy M. Serov ◽  
Tatiana V. Lvova ◽  
Raimu Endo ◽  
Takuya Masuda ◽  
...  
Keyword(s):  
Surface Passivation ◽  
Sodium Sulfide ◽  
Aqueous Sodium ◽  
Sodium Sulfide Solution ◽  
Sulfide Solution

Coordination of the chemical and electronic processes in GaSb(100) surface modification with aqueous sodium sulfide solution

2018 ◽  
Vol 6 (21) ◽  
pp. 5760-5768 ◽  
Author(s):  
Mikhail V. Lebedev ◽  
Tatiana V. Lvova ◽  
Irina V. Sedova
Keyword(s):  
Surface Modification ◽  
Redox Reaction ◽  
Sodium Sulfide ◽  
Aqueous Sodium ◽  
Gallium Sulfide ◽  
Sodium Sulfide Solution ◽  
Sulfide Solution

GaSb(100) surface electronic passivation with aqueous Na2S solution is driven by the redox reaction of gallium sulfide and elemental antimony formation.

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