ABSTRACT
A rapid, simple, inexpensive, and relatively accurate field-test method for the determination of lead (Pb) in paints, dusts, and soils has been developed. The method involves the ultrasonic leaching of 0.1 to 0.5 g of the sample in 5 ml of 25% (v/v) nitric acid for 30 min, followed by colorimetric measurement with a commercially available field-test kit. A variety of actual field samples and several National Institute of Standards and Technology (NIST) standard reference materials (SRMs) were tested using the proposed method. Results were compared with those obtained with a microwave, total-digestion method followed by inductively coupled plasma emission measurement. Lead recovery and method precision were better than 84 and 11%, respectively, for a variety of SRMs and field samples. No apparent interferences were encountered in the ultrasonic/nitric acid sample extracts.
This paper has been reviewed in accordance with the U.S. Environmental Protection Agency peer and administrative review policies and approved for presentation and publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
