Fruit and potatoes. Exception is not equal to the excess and poisoning, in Hong Kong, for example, food that Yun Tibetan maximum allowable concentrations of mercury 0.5ppm (1ppm=1mg/kg), we can think of, is less than this value, which
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is basically safe. This reminds us of on "Mercury" measurement standard, on the current situation, whether domestic or foreign, on mercury testing standards there is a shortage, in particular criteria for detection of mercury content of milk powder, not only exist different standards at home and abroad, even internally, there are conflicting.