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The extraction of nickeldimethylglyoxime by chloroform has been investigated as a function of pH. In pure nickel solutions extraction is complete in the pH range 4.7-10 in tartrate solutions in the range 4.8-12 and in citrate solutions in the range 7.2-12. Interferences by copper and cobalt are discussed.For the photometric determination of the extracted nickel as the oxidized nickeldimethylglyoxime complex an improved procedure has been developed resulting in a colour system of great stability.

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