This is a quality-assurance plan, not a results report. Alex Stone wrote it for the Washington State Department of Ecology. Publication 12-07-023, March 2012, 20 pages.
Key numbers
The laboratory section says metals samples will be prepared following EPA 3052, microwave complete digestion, and measured using ICP-MS or cold-vapor atomic absorption for mercury. The reporting-limit table lists antimony, arsenic, cadmium, chromium, cobalt, copper, lead, molybdenum, and zinc at 1.0 ppm, each as EPA 3052, ICP-MS, EPA 6020. Mercury is on the same table at 0.1 ppm, also as EPA 3052, ICP-MS, EPA 6020. Chromium here is total chromium. There is no hexavalent-chromium row and no nickel row.
The plan does not mention wipes. The body text of the later results report calls the phthalates plan Ecology 2012b. The bibliography of that report gives this title, phthalates and metals in children’s products, 20 pages, as Ecology 2012b. The publication number 12-07-023 is not printed in that bibliography.
Methods (brief)
Results from the work that followed are in Metals in Children's and Consumer Products and Packaging. That report does not print “3052” or “6020” on a wipe row.
Evidence fitness
The plan supports the method and the 1.0 ppm reporting limit, including total chromium, that this children’s-product plan specified. It does not support a wipe concentration or a hexavalent-chromium result.
Limitations
Publication 14-04-014 prints wipe chromium at 0.5 and 0.6 ppm and wipe lead at 0.4 and 0.8 ppm. Those printed values sit below this plan’s 1.0 ppm reporting limit. The results report does not explain them as less-than that limit. A printed 0.0 remains the table value.
Related evidence
Update history
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