Reconsideration of methods and standards: Digestion of diaper wipes and use of matrix-matched calibration standards for dust lead analysis
Journal Article
·
· Environmental Science and Technology
Diaper wipes are widely used for sampling residential dust for lead analysis. A thicker type of diaper wipe was incompletely digested and had low recoveries of lead on stock solution spikes using existing protocols. A modified protocol was applied to various quality control samples prepared with thicker diaper wipes in 134 batches of field samples. Modifications included a larger reagent volume, more concentrated acid, 3 h on the hot plate, and squeezing wipe residues during filtration. Seventeen batches were reanalyzed using matrix-matched standards. Acceptable lead recoveries were obtained for stock solution spikes (88%) and spikes prepared with leaded dust-SRM 2582 (88%), SRM 2589 (96%), and CRMO 14-050 (99%). Matrix-matched calibration standards increased mean lead recoveries by an additional 8%. Their protocol may provide a basis for a standard operational procedure for wipe digestion and analysis. Differences in estimates of dust lead loadings attributable to the type of wipe and to sample preparation and calibration procedures have implications for risk assessment, clearance testing, and comparability of laboratory data. Reconsideration of current protocols for wipe materials, wipe digestion, and judging laboratory performance is warranted.
- Research Organization:
- Johns Hopkins School of Hygiene and Public Health, Baltimore, MD (US)
- OSTI ID:
- 20006586
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 24 Vol. 33; ISSN ESTHAG; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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