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Copper has been determined by β-correction spectrophotometry with eriochrome black T (EBT). This reaction is selective in the presence of EDTA to mask other metal ions. A non-ionic surfactant, polyethyleneglycol n-octanoic phenylether (emulsifying agent, OP), was found to increase the sensitivity. The β-correction method can completely eliminate the effect of excess EBT in its Cu II ...
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