Nitric Acid, Lead-Free
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
Use ACS reagent grade.
Lead: To 100 g add 0.1 g of anhydrous sodium carbonate and evaporate to dryness. Dissolve the residue in water, heating slightly, and dilute with the same solvent to 50.0 mL. Determine the lead content by atomic absorption spectrophotometry (see Atomic Absorption Spectroscopy 〈852〉) measuring the absorbance at 283.3 nm or 217.0 nm using a lead hollow-cathode lamp and an air–acetylene flame. It contains not more than 0.1 ppm of lead (Pb).
