Which standard covers ultrasonic extraction of samples for lead determination?

Which standard covers ultrasonic extraction of samples for lead determination?

• A. ASTM E 1729
• B. ASTM E 1645
• C. ASTM E 1775-96
• D. ASTM E 1979-98

Answer: (D)

Ultrasonic extraction is a sample preparation step that uses high-frequency sound energy to disrupt the solid matrix and release lead into a solvent so it can be measured. A standard that specifically provides guidance on performing ultrasonic extraction for lead determination will give practical instructions on solvent selection, extraction time, temperature, equipment setup, and QA/QC criteria tailored to this technique. Because it directly addresses how to execute ultrasonic extraction for lead, it serves as the authoritative reference for this method. The other standards cover different approaches to sample preparation or general practices that do not focus on ultrasonic extraction, so they don’t precisely govern this technique.

Ultrasonic extraction is a sample preparation step that uses high-frequency sound energy to disrupt the solid matrix and release lead into a solvent so it can be measured. A standard that specifically provides guidance on performing ultrasonic extraction for lead determination will give practical instructions on solvent selection, extraction time, temperature, equipment setup, and QA/QC criteria tailored to this technique. Because it directly addresses how to execute ultrasonic extraction for lead, it serves as the authoritative reference for this method.

The other standards cover different approaches to sample preparation or general practices that do not focus on ultrasonic extraction, so they don’t precisely govern this technique.