Trace metal analysis of rocks and sediments by graphite furnace atomic absorption spectroscopy

Abstract

An accurate and precise method for the determination of seven common trace metals (Cd, Co, Cr, Cu, Ni, Pb, and Zn) in rocks and sediments, from as little as 5 milligrams of sample, is presented. The method employs a wet digestion in Teflon 1 beakers using a combination of HF, HClO/j, and HN03. Quantitation is carried out by graphite furnace atomic absorption spectrophotometry using mixed salt standards, and where appropriate, deuterium source background correction, or matrix modifiers, or both. Comparison of data generated by this procedure, with published data for U.S. Geological Survey Standard Rocks and National Bureau of Standards sediments, as well as through inter-and intralaboratory comparisons on natural sediment samples, indicate that precise and accurate results can be obtained. : The use of brand names in this report is for identification purposes only, and does not constitute an endorsement by the U.S. Geological Survey.