Quick view View Item Quality Control Standard 21, 100ug/mL (100 ppm) for AA & ICP, 125 mL Quality Control Standard 21, 100 µg/mL (100 ppm) for AA & ICP, 125 mL Assurance® Grade Quality Control Standard 21, 100 µg/mL (100 ppm) for AA & ICP in 5% HNO3/tr. Tartaric Acid/tr. HF, 125 mL Product Information Part #... Weight: 1.00 LBS View Item Quick view Qty in Cart: 0 Price: Subtotal: