Potassium Hydrogen Phthalate Acidimetric Standard Crystal Reagent Special ACS Inorganic Ventures ICP Single-Component Standards 00% LEAD (Pb) 2 mg/kg

00% LEAD (Pb) 2 mg/kg IRON (Fe) 10 mg/kg SELENIUM (Se) 5 mg/kg IDENTIFICATION TO PASS TEST TO PASS TEST RETEST DATE DATE OF MANUFACTURE APPEARANCE

Test Specification Min Max APPEARANCE WHITE POWDER WHITE POWDER

Test Specification Min Max APPEARANCE COLORLESS

Test Specification Min Max APPEARANCE WHITE XTALLINE P WHITE XTALLINE P ASSAY 97% 97%

0002 meq RETEST DATE

Potassium Hydrogen Phthalate Acidimetric Standard Crystal Reagent Special ACS Inorganic Ventures ICP Single-Component Standards 00% LEAD (Pb) 2 mg/kgTest Specification Min Max ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % pH OF A 0. 05M SOLUTION @ 25[dC 4. 00 4. 02 4. 00 4. 02