Merck 105057 1000 Potassium Disulfite Gr For Analysis 1 KG.

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Description
Catalogue Number	105057
Synonyms	Potassium metabisulfite, Potassium pyrosulfite

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Product Information
CAS number	16731-55-8
EC number	240-795-3
Hill Formula	K₂O₅S₂
Chemical formula	K₂S₂O₅
Molar Mass	222.33 g/mol
HS Code	2832 20 00
Quality Level	MQ300

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Physicochemical Information
Melting Point	150 °C (decomposition)
pH value	3.0 - 4.5 (50 g/l, H₂O, 20 °C)
Bulk density	1000 - 1300 kg/m3
Solubility	450 g/l

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Toxicological Information
LD 50 oral	LD50 Rat 2300 mg/kg

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Safety Information according to GHS
Hazard Pictogram(s)	\n\n
Hazard Statement(s)	H318: Causes serious eye damage.\nH335: May cause respiratory irritation.\nEUH031: Contact with acids liberates toxic gas.
Precautionary Statement(s)	P261: Avoid breathing dust.\nP271: Use only outdoors or in a well-ventilated area.\nP280: Wear eye protection/ face protection.\nP304 + P340 + P312: IF INHALED: Remove person to fresh air and keep comfortable for breathing. Call a POISON CENTER/doctor if you feel unwell.\nP305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.\nP403 + P233: Store in a well-ventilated place. Keep container tightly closed.
Signal Word	Danger
RTECS	TT4920000
Storage class	10 - 13 Other liquids and solids
WGK	WGK 1 slightly hazardous to water
Disposal	6\nSulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E.

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Safety Information
Categories of danger	irritant

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Storage and Shipping Information
Storage	Store at +2°C to +30°C.

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Transport Information
Declaration (railroad and road) ADR, RID	Kein Gefahrgut
Declaration (transport by air) IATA-DGR	No Dangerous Good
Declaration (transport by sea) IMDG-Code	No Dangerous Good

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Specifications
Assay (iodometric)	≥ 96 %
In water insoluble matter	≤ 0.005 %
Chloride (Cl)	≤ 0.005 %
As (Arsenic)	≤ 0.0001 %
Cu (Copper)	≤ 0.001 %
Fe (Iron)	≤ 0.0005 %
Pb (Lead)	≤ 0.001 %
Zn (Zinc)	≤ 0.001 %