A new photometric method for the determination of molybdenum (VI) with 4-hydroxy- coumarinthiol is reported in this paper. The reagent forms a stable intensely coloured violet complex extracted in chloroform. The complex extracted from 1 M HCl absorbs maximum at 560 nm and has the molar absorptivity 1.2 x 10 4 1. mole-1 cm-1. The system conforms to Beer's law from 0.5 to 12 ppm with optimum range 1-7 ppm at 560 nm. The Sandell's ...
