Application of X-ray Absorption Fine Structure (XAFS) Spectroscopy to Speciation of Lead (Pb) Contaminants in Plastics
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A study using X-ray absorption fine structure (XAFS) spectroscopy in conjunction with chemical analyses was undertaken to determine the form of lead (Pb) compound(s) used as additives in plastic bags. Comparison of Pb L<sub>III</sub>-edge X-ray absorption near-edge structure (XANES) in samples with those of the standards, and XANES simulation studies revealed that spectra of samples were almost identical to that of PbCrO<sub>4</sub>, and ca. 80% of Pb was present in the form of PbCrO<sub>4</sub>. These findings were supported by the facts that Cr-XANES spectra of samples resembled that of PbCrO<sub>4</sub>, and Cr/Pb molar ratios in samples calculated from simulation of XANES agreed reasonably well with those of the chemical data. Results of <i>k</i><sup>3</sup>-weighted extended X-ray absorption fine structure (EXAFS) spectra of three of the samples showed that they resembled that of the PbCrO<sub>4</sub>.
- Bulletin of the Chemical Society of Japan
Bulletin of the Chemical Society of Japan 88(2), 341-345, 2015
The Chemical Society of Japan