NOM-252-SSA1-2011 sets Mexican environmental-health requirements for toys and school articles. Section 5.2 and Table 1 set maximum bioavailability limits for soluble heavy metals from toy and school-article materials, with one row for general materials and a second row for preschool school articles, modeling clay, and finger paint. The method simulates four hours in the alimentary tract after ingestion and reports results as mg of element per kg of material. The structured rows transcribe the HMI-controlled metals and omit barium and selenium.
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