Abstract
1,5-Bis(di-2-pyridylmethylene)thiocarbonohydrazide (DPTH) has been examined to evaluate its usefulness as a sensitive spectrophotometric reagent for the determination of nickel and cobalt. Two photometric methods are described for the determination of trace amounts of cobalt, one of which has been applied to the determination of cobalt in steels. A method for the determination of trace amounts of cobalt and nickel in mixtures has also been developed.
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