Finoric LLC

Selenious Acid

Selenious Acid Commercial Pure and USP Grade Supplier, Manufacturer's Representative

CAS number : 7783-00-8
Molecular Weight: 128.97
Chemical Formula: H2SeO3

FInOrIC, etymologically derived from our business line of Fine Inorganic, Organic and Industrial Chemicals, is the internationally preferred source for Chemicals. With customers in 55 countries across 5 continents, we source and sell most chemicals. Backed by owned full fledged chemical manufacturing facilities in Midland & Houston Area Texas with associated manufacturing sites in India, Dubai, China and USA we are a truly multi-national chemical manufacturer & distributor. Fracturing and Fracking Industry can rely on our 24x7 - 365days service including week-end deliveries.

DESCRIPTION

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
Formula: H2SeO3
Weight: 128.97
Selenium dioxide, monohydrated. --- [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.


Most of our partners facilities of MANUFACTURE BULK DRUGS/API, EXCIPIENTS, PHARMACEUTICALS (IP/BP/USP/NF/PH. EUR./JP), SPECIALITY CHEMICALS (PURE/AR/ACS), MINERAL FORTIFIERS (FCC). OUR MANUFACTURING FACILITY IS GLP, GMP (FDA) APPROVED, ISO 9001, ISO 14001, ISO 22000, FSSC 22000, FSSAI, KOSHER, HALAL, COPP AND WHO-GMP CERTIFIED.

Good Manufacturing Practice Certified by World Health Organization (WHO-GMP)
Written Confirmation Certification (WC)
Good Manufacturing Practice (cGMP)
Good Laboratory Practice (GLP)


Finoric LLC