Spectrophotometric determination of trace amounts of cadmium in high purity zinc materials with iodide and rhodamine 6G.
A highly selective and sensitive spectrophotometric procedure for the determination of cadmium is developed. This is based on the interaction of rhodamine 6G with tetraiodocadmate (II) anion to form a pink product which absorbs maximally at 575 nm that is stable for 24 hr when stabilized with gelatin. Cadmium concentrations as low as 0.01 ppm can be readily determined. The method is precise and has been applied to synthetic sea water samples and high purity zinc materials.
Kartikeyan
S
S
Regional Research Laboratory (CSIR), Trivandrum 695 019, India.
Rao
T P
TP
Iyer
C S
CS
Damodaran
A D
AD