Certificate of Analysis

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QA: Sharon Lee

QC: Paulo Park Date:

Jan. 15, 2015

CAS 304-55-2 Batch No. B15L0112

Product Name 2, 3-dimercaptosuccinic acid Batch size 1,300 g

MFG. Date Jan. 12, 2015 Retest Date Jan. 11, 2017

TESTING ITEM SPECIFICATION RESULT

Appearance White to off-white crystalline powder White crystalline powder

Melting point 190°C-194°C 192°C-194°C

Identification 1. It should generate light yellow precipitate. 2. The solution should show purplish red. 3.The IR spectrum is consistent with that of standard.

Conforms Conforms Conforms

pH 2.5-3.0 2.6

Loss on drying ≤1.0% 0.083%

Reside on ignition ≤1.0% 0.05%

Heavy metals ≤10 ppm Conforms

Related substances If impurity is shown in test solution, it should be darker

(1.5%) than the reference solution. Conforms

Solvent residue Methanol: ≤0.3% Ethanol: ≤0.5%

N. D. 0.3%

Assay (C4H6O4S2 ) ≥ 98.5%(on dried basis ) 99.9%

Microbial limits Total bacteria count: ≤100 cfu/g Mold & Yeast count: ≤100 cfu/g

E. coli: Absent/g

<10 cfu/g <10 cfu/g Absent

Conclusion Correspond

Odor A special garlic-smelling Conforms

Solubility Slightly soluble in methanol and ethanol; insoluble in

water and trichloromethane Conforms

2, 3-dimercaptosuccinic acid

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