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  • Title: Chromium in leather footwear - risk assessment of chromium allergy and dermatitis.
    Author: Thyssen JP, Strandesen M, Poulsen PB, Menné T, Johansen JD.
    Journal: Contact Dermatitis; 2012 May; 66(5):279-85. PubMed ID: 22486570.
    Abstract:
    BACKGROUND: Chromium-tanned leather footwear, which releases >3 ppm hexavalent Cr(VI), may pose a risk of sensitizing and eliciting allergic dermatitis. OBJECTIVES: To determine the content and potential release of chromium in leather footwear and to discuss the prevention of chromium contact allergy and dermatitis. METHODS: Sixty pairs of leather shoes, sandals and boots (20 children's, 20 men's, and 20 women's) were purchased in Copenhagen and examined with X-ray fluorescence spectroscopy. Chromium was extracted according to the International Standard, ISO 17075. The detection level for Cr(VI) was 3 ppm. RESULTS: Chromium was identified in 95% of leather footwear products, the median content being 1.7% (range 0-3.3%). No association with store category or footwear category was found. A tendency for there to be a higher chromium content in footwear with high prices was shown (p(trend) = 0.001). Cr(VI) was extracted from 44% of 18 footwear products, and, in three items, more than 10 ppm was extracted. One shoe had 62 ppm Cr(VI) extracted. Sandals seemed to be over-represented among footwear with detectable Cr(VI). Cr(III) extraction reached a median value of 152 ppm. CONCLUSIONS: Most leather footwear contained chromium. Cr(VI) was extracted from a high proportion of leather footwear; this poses a risk of sensitization.
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