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Study on scheme for screening, quantification and interpretation of trace amounts of hazardous inorganic substances influencing hazard classification of a substance in REACH registration
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2019, v.32 no.6, pp.233-242
https://doi.org/10.5806/AST.2019.32.6.233
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(2019). Study on scheme for screening, quantification and interpretation of trace amounts of hazardous inorganic substances influencing hazard classification of a substance in REACH registration. Analytical Science and Technology, 32(6), 233-242, https://doi.org/10.5806/AST.2019.32.6.233
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Abstract
Substance identification is the first step of the REACH registration. It is essential in terms of Classification, Labelling and Packaging (CLP) regulation and because even trace amounts of impurities or additives can affect the classification. In this study, a scheme for the screening, quantification, and interpretation of trace amounts of hazardous inorganic substances is proposed to detect the presence of more than 0.1% hazardous inorganic substances that have been affecting the hazard classification. An exemplary list of hazardous inorganic substances was created from the substances of very high concern (SVHCs) in REACH. Among 201 SVHCs, there were 67 inorganic SVHCs containing at least one or ~2-3 heavy metals, such as As, Cd, Co, Cr, Pb, Sb, and Sn, in their molecular formula. The inorganic SVHCs are listed in excel format with a search function for these heavy metals so that the hazardous inorganic substances, including each heavy metal and the calculated ratio of its atomic weight to molecular weight of the hazardous inorganic substance containing it, can be searched. The case study was conducted to confirm the validity of the established scheme with zinc oxide (ZnO). In a substance that is made of ZnO, Pb was screened by XRF analysis and measured to be 0.04% (w/w) by ICP-OES analysis. After referring to the list, the presence of Pb was interpreted just as an impurity, but not as an impurity relevant for the classification. Future studies are needed to expand on this exemplary list of hazardous inorganic substances using proper regulatory data sources.
- keywords
- REACH, substance identification, classification, hazardous inorganic substance, heavy metals
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