Copper (II) Ion binds with oxygen through the inorganic agent such as H2O, OH-, CO3 2-, SO4-2, ... for organic agents through groups such as the phenolic and carboxylic (Cotton & Wilkinson, 1989 quoted in WHO, 1998). So most of the copper in complex with natural organic compounds (Allen & Hansen, 1996 quoted in WHO, 1998).
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