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Evaluation of the Spectrophotometric Determination of Zinc with Methylene Blue and Thiocyanate

Isjrin Noerdin,

Data & Software Engineering Research Group
STEI-ITB, Jl. Ganeca No.10, Bandung 40132, Indonesia


The reaction of zinc with methylene blue and thiocyanate is developed to a highly sensitive spectrophotometric  determination of zinc in which the unknown zinc is reacted with methylene blue and thicyanate, giving insoluble complex.

This is filtered off and the decrease in the amount of zinc present, is measured. Suitable masking agents prevent interference of most common ions, even when present in large amounts, except with cobalt, copper, cadmium and mercury which do not interfere if present in small amounts only. In simplicity, sensitivity and freedom from interference this method compares favorably with dithizone and zincon methods.

Keywords: Chemistry, Zinc, Methylene Blue

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