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Sodium Formaldehyde Sulfoxylate or Sodium Formaldehyde Sulphoxylate or Rongalit or Sodium Hydroxymethylsulfinate, or Bruggolite or Sodium Oxymethylene Sulfoxylate or Hydroxymethanesulfinic acid monosodium salt USP NF Grade Grade Supplier Exporter Manufacturers' Representative |
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Sodium Formaldehyde Sulfoxylate or Sodium Formaldehyde Sulphoxylate or Rongalit or Sodium Hydroxymethylsulfinate or Bruggolite or Sodium Oxymethylene Sulfoxylate or Hydroxymethanesulfinic acid monosodium salt
CAS Number: 6035-47-8 Dihydrate and 149-44-0 Anhydrous
Molecular Formula: CH3NaO3S
Molecular Weight: 118.10 Anhydrous and 154.14 dihydrate
Sodium Formaldehyde Sulfoxylate or Sodium Formaldehyde Sulphoxylate or Rongalit or Sodium Hydroxymethylsulfinate or Bruggolite or Sodium Oxymethylene Sulfoxylate or Hydroxymethanesulfinic acid monosodium salt
General Properties and Specifications of Sodium Formaldehyde Sulfoxylate or Sodium Formaldehyde Sulphoxylate or Rongalit or Sodium Hydroxymethylsulfinate or Bruggolite or Sodium Oxymethylene Sulfoxylate or Hydroxymethanesulfinic acid monosodium salt:
Appearance: Colorless crystals or flakes.
Assay: 99%
pH: 9.5 to 10.5
Relative density: 1.75 Dihydrate.
Melting point: 64.5 Dihydrate (literature).
Solubility: Soluble in water.
Sodium Formaldehyde Sulfoxylate USP NF Grade Specifications:
CH3NaO3S --- 118.09
CH3NaO3S-2H2O --- 154.11
Methanesulfinic acid, hydroxy-, monosodium salt;
Monosodium hydroxymethanesulfinate CAS 149-44-0
Dihydrate CAS 6035-47-8
UNII: X4ZGP7K714
DEFINITION
Sodium Formaldehyde Sulfoxylate contains an amount of sodium formaldehyde sulfoxylate (CH3NaO3S) equivalent to NLT 45.5% and NMT 54.5% of SO2, calculated on the dried basis. It may contain a suitable stabilizer, such as sodium carbonate.
IDENTIFICATION
A.
Sample solution: Dissolve 4 g in 10 mL of water in a test tube.
Analysis: To the Sample solution add 1 mL of silver–ammonia–nitrate.
Acceptance criteria: Metallic silver is produced, either as a finely divided, gray precipitate or as a bright metallic mirror on the inner surface of the tube.
B.
Sample solution: Dissolve 40 mg of salicylic acid in 5 mL of sulfuric acid, and add 50 mg of Sodium Formaldehyde Sulfoxylate.
Analysis: Warm very gently.
Acceptance criteria: A permanent, deep red color appears.
Analysis: Dissolve 6 g in 14 mL of water in a test tube and wet a strip of lead acetate test paper with the clear solution.
Acceptance criteria: No discoloration is evident within 5 min.
Iron: To pass the test.
Acceptance criteria: 0.0025%; the color of the Sample is not deeper than that of the Standard solution.
Sodium Sulfite: To pass the test.
Acceptance criteria: NMT 5.0% on the dried basis
pH: 9.5–10.5
Loss on Drying:
Analysis: Dry at 105C for 3 h.
Acceptance criteria: NMT 27.0%
Alkalinity:
Sample solution: 1.0 g of Sodium Formaldehyde Sulfoxylate in 50 mL of water
Analysis: To the Sample solution add phenolphthalein and titrate with 0.10 N sulfuric acid.
Acceptance criteria: NMT 3.5 mL is required for neutralization.
Clarity and Color of Solution: To pass the test.
The Sample solution and the water are equally clear and, when viewed transversely by transmitted light, exhibit no apparent difference in color.
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