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Identification of Copper Contamination in Sediments by a Microscale Partial Extraction Technique

Oregon Grad. Inst., Dep. Environmental Science and Engineering, 19600 Von Neumann Drive, Beaverton, OR 97006-1999.

^* Corresponding author.

ABSTRACT

A H₂O₂/HNO₃ microscale extraction procedure is described for the partial removal of metals from sediments. The procedure is carried out at room temperature for approximately 24 h, and requires only 50 mg of dried sample and 1 mL of extraction solution for a single extraction. The characteristics of the procedure were investigated in detail for Cu-contaminated sediment samples taken from stormwater runoff detention ponds and a background soil sample. The H₂O₂/HNO₃ microextraction was compared to a more commonly employed HCl extraction. Taken collectively the data indicate that the procedure extracts Cu in excess of native levels in a systematic way over the range of total Cu concentration investigated. Copper concentrations derived by this method appear to be useful indicators of anthropogenic contamination provided an appropriate background sample is used to determine native levels of Cu.

This research was sponsored in part by the U.S. Geol. Surv., through the Oregon Water Resources Research Institute, project no. G1444-05, and with assistance from the Rose M. Tucker Foundation.

Received for publication May 8, 1990.

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