Manual and fia methods for the determination of cadmium with malachite green and iodide - Garcia, I.L.; Navarro, P.; Cordoba, M.H. (Elsevier)
A sensitive and rapid spectrophotometric method for the determination of cadmium is described, based on the formation of a blue complex at pH 4 between the anionic iodide complex of cadmium(II) and Malachite Green; the colour is stabilized with poly(vinyl alcohol). The calibration graph for measurement at 685 nm is linear over the range 1-50 μg of cadmium per 25 ml of final solution, with a relative standard deviation of +/-1.7% for 1 μg/ml cadmium. The molar absorptivity is 6.1 x 10^4 1.mole^-^1.cm^-^1. The method can be successfully adapted for FIA, the peak height being proportional to the cadmium concentration over the range 0.1-3 μg/ml; a two-channel manifold is used and an improvement in selectivity is obtained. The use of a gradient tube is demonstrated to give a good calibration for Cd(II) over the range 2 x 10^-^2 -2 x 10^-^6M.
http://linkinghub.elsevier.com/retrieve/pii/0039-9140(88)80207-8
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