Dithizone organolead compounds

The dithizone method has been applied for determining lead in biological samples [44,89,90], waters [8,15,91], soils [92],organic materials [93], plant materials [94,95], air (inorganic lead and organolead compounds) [96-98], silicate minerals [99], steel [2], molybdenum and tungsten [100], silver [34], cadmium [101], cobalt [11,13], boron [45], telluric acid [102], antimony sulphide [103], and gasoline [104],... 

Aldridge, W. N., Street, B. W., Spectrophotometric and Fluorimetric Determination of Tri- and Di-organotin and -organolead Compounds Using Dithizone and 3-Hydroxyflavone, Analyst [London] 106 [1981] 60/8. 

The presence of tetra-organolead compounds in fuels is detected by first decolorizing the fuel from added dye with activated charcoal. A drop of fuel is placed on a filter paper and irradiated under an ultraviolet lamp, hence evaporating fuel and decomposing the organo-lead. Lead is then detected by adding a drop of freshly prepared 0-1 % solution of dithizone in chloroform. A deep red spot of lead dithizonate indicates presence of lead, and retention of the green dithizone colour indicates absence of the metali. ... 

Analysis by GC of the various organolead species present in gasoline requires special detectors because of the profusion of species with retention times near those of the organometaHic compounds. An old determination method consisted of scrubbing the separated species in iodine solution, foHowed by spectrophotometric determination of the complex with dithizone (2)133,134 (see also Table 2). 

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