Dioxins in clay: Broad geographic study leads to global ...
Sep 04, 2011 · Clays from Indonesia and South Korea contained 35 and 41 ng/g dioxins, respectively, and the mean value for Chinese kaolin was 300 pg/g, with a range of pg/g. The most abundant clays were those from the USA with 520,000 pg/g dioxins. Two types of Japanese clay, Kibushi and Gaerome, also contained relatively high concentrations at 5900 ...