A 50 mg portion of metallic copper (100 mesh) placed in 50 ml of a neutral solution containing 0.1 mol dm−3 ethylenediaminetetraacetate (EDTA) was quantitatively dissolved within 20 min at 50 °C after the addition of a small amount of hydrogen peroxide, resulting in blue coloration of the copper(II)–edta complex.
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Ohzeki et al. (1979) studied this question.
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