Abstract
Tetramethylthiuram disulphide (TMTD) is used for the extraction and spectrophotometric determination ofμg quantities of osmium. 15 ml of 1.052×10−3 M TMTD in toluene quantitatively extracts osmium from7 M HCl. The complex attains maximum colour intensity in 2 hours. It is red in colour and exhibits two λ max. One at 445 nm and the other at 504 nm. The maximum at 504 nm is more significant. Beer's law was found to hold good over the concentration range of 1.7 to 26.7μg of osmium per ml. The Ringbom plot shows the optimum range of 9.42 to 23.65μg of osmium per ml. The optimum period of equilibration is 30 seconds and the complex is stable up to 5 hours. The extracted species shows the composition to be 1 ∶ 1 (Os ∶ TMTD). It is possible to extract and determine osmium in the presence of other platinum metals with composition corresponding to the ore osmiridium.
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