Aakash Manthan Industries S8- Sarifa Mansion, 2nd Flank Road, Chinchbunder, Opp. Kesar Baug, Mumbai 400009. India Tele: 91-22-23770100; Fax: 91-22-23728264; Mobile: 91-9821870100; e-mail: info@mubychem.com

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Selenious Acid USP & Sodium Selenite BP Grade Manufacturers MSDS of Selenious Acid MSDS of Sodium Selenite Selenous acid (or selenious acid) is the chemical compound with the formula H2SeO3. Structurally, it is more accurately described by (HO)2SeO. The major use is in changing the color of steel, especially the steel in guns & razor blades the so-called "bluing" process which uses selenous acid. Some older were also made of blued steel. It is also used in darkening of copper, brass and bronze, producing a rich dark brown color. Specifications of Commercial Pure Selenious Acid CAS Number 7783-00-8 Molecular formula: H2SeO3 Molecular weight: 128.97 Description: White to off-white hygroscopic crystalline mass. Residue on ignition: Max. 0.1 %. Assay: Between 93.0% and 101.0%. Selenious Acid USP Grade H2SeO3 -- 128.97 Selenium dioxide, monohydrated. Selenious acid CAS Number 7783-00-8 Selenious Acid contains not less than 93.0 percent and not more than 101.0 percent of H2SeO3. Identification A: Dissolve about 50 mg in 5 mL of water, add about 100 mg of sodium bicarbonate, and mix: gas bubbles develop. B: Dissolve about 50 mg in 5 mL of 0.1 N hydrochloric acid, and add about 50 mg of stannous chloride: a curdy tan-orange precipitate is formed. Tests Residue on ignition: not more than 1.0 mg, from 10.0 g (0.01%). Insoluble matter: Dissolve 1 g in 5 mL of water: it dissolves completely and the solution is clear. Selenate and sulfate: Dissolve about 0.5 g in 10 mL of water, add 0.1 mL of hydrochloric acid and 1 mL of barium chloride, and mix: no turbidity or precipitate is formed in 10 minutes. Assay: Transfer about 100 mg of Selenious Acid, accurately weighed, to a suitable glass-stoppered flask, and dissolve in 50 mL of water. Add 10 mL of potassium iodide solution (3 in 10) and 5 mL of hydrochloric acid, mix, insert the stopper in the flask, and allow to stand for 10 minutes. Add 50 mL of water and 3 mL of starch, and titrate with 0.1 N sodium thiosulfate until the solution is colorless, then titrate with 0.1 N iodine VS to a blue endpoint. Subtract the volume of 0.1 N iodine from the volume of 0.1 N sodium thiosulfate to obtain the volume of 0.1 N sodium thiosulfate equivalent to selenious acid. Each mL of 0.1 N sodium thiosulfate is equivalent to 3.225 mg of H2SeO3. Sodium selenite is the inorganic compound with the formula Na2SeO3. This salt is a colourless solid. The pentahydrate Na2SeO3(H2O)5 is the most common water-soluble selenium compound. Sodium selenite is mainly used in the manufacture of colorless glass. The pink color imparted by these selenites cancels out the green color imparted by iron impurities. Because selenium is an essential element, sodium selenite is an ingredient in some food supplements. The US Food and Drug Administration approved a selenium supplement to animal diets, however the most common form is sodium selenite for pet foods. Sodium Selenite Pentahydrate BP Grade Ph Eur Na2SeO3,5H2O -- 263.0 -- CAS Number 26970-82-1 DEFINITION Content: 98.5 per cent to 101.5 per cent. CHARACTERS Appearance: White or almost white, crystalline powder, hygroscopic. Solubility: Freely soluble in water, practically insoluble in ethanol (96 per cent). IDENTIFICATION A. Dissolve 50 mg in 5 ml of a mixture of equal volumes of dilute hydrochloric acid and water and heat to boiling. Add 0.05 g of ascorbic acid; a red precipitate is formed which may become black. B. Dissolve 50 mg in a mixture of 1 ml of dilute hydrochloric acid and 5 ml of water. Add 1 ml of barium chloride solution; the solution remains clear. C. It gives reaction of sodium. D. It complies with the limits of the assay. TESTS Solution S: Dissolve 5.0 g in carbon dioxide-free water and dilute to 50.0 ml with the same solvent. Appearance of solution: Solution S is clear and colourless. pH: 9.8 to 10.8 for solution S. Chlorides: Maximum 50 ppm. Sulphates and selenates: Maximum 300 ppm (determined as sulphates). Iron: Maximum 50 ppm. Sodium Selenite Anhydrous is also offered as per below mentioned specifications. CAS Number 10102-18-8 Molecular Formula: Na2SeO4 Molecular Weight: 172.94 EINECS: 233-267-9 MP: 350° C Sensitive: Hygroscopic Appearance: White to off white Crystalline Powder Water Solubility: 950 g/L (20° C) Selenium Content: 45% LOD (By IR): 0.5% max., at 100° C for 1 hr. Iron as Fe: 0.005% max. Sulphate as SO4: 0.2% max. Assay: 98.5% min. ( on dry basis )

Aakash Manthan Industries and the group companies are manufacturing chlorides since several decades. We have automatic vacuum operated titanium evaporators and SS316 equipments to produce top grade of chemicals. We have toll manufacturers and representatives in China, UAE, Europe, Canada & USA and agents & customers in all countries like USA, Canada, Europe, UAE, South Africa, Tanzania, Kenya, Egypt, Nigeria, Uganda, Turkey, Mexico, Brazil, Chile, Argentina, Bangkok Thailand, Malaysia, Dubai UAE etc. & sales representative in Chicago, Houston New York & Los Angeles, USA. Associated units are FDA-GMP-GLP certified, Halal and/or Kosher certified, REACH registered, ISO-9001, ISO-22000 HACCP certified.

Contact Selenious Acid USP & Sodium Selenite BP Grade manufacturers exporters:

Aakash Manthan Industries
S-8, SARIFA MANSION, 2ND FLANK ROAD, CHINCHBUNDER, MUMBAI 400009, INDIA
TEL: (OFFICE) 91-22-23770100, 23726950, 23774610, 23723564. FAX: 91-22-23728264

 e-mail: info@mubychem.com

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