Lead dibenzyldithiocarbamate

Zinc dibenzyldithiocarbamate (formula 19.1), which is soluble in CCI4 and CHCI3, is less selective than Pb(DDTC)2 but more resistant to highly acidic media [20]. With this reagent, copper can be extracted from 1-2 M HCl or H2SO4. Lead dibenzyldithiocarbamate has been used similarly [21]. 

A 0.1 % solution of lead dibenzyldithiocarbamate can also be used as reagent. 2... 

Bismuth has been determined with the use of zinc dibenzyldithiocarbamate (CCI4, e = 1.2-10, at 370 nm) [17,18], lead tetramethylenedithiocarbamate [19], and pyrrolidine-dithiocarbamate [20]. 

Sodium-dibenzyldithiocarbamate (Na-DBDTC) tends to precipitate as carbamic acid at pH levels less than 4.8. Introduced into the column it accumulates at the column on its top and later redissolves in the CHCls CHsOH mixture, resulting in poor sample spots on the carrier. This leads to a large background signal and deterioration of the detection limits. Low lead and cadmium concentrations in open ocean water can be difficult or impossible to detect under such conditions. Thus, precipitation of carbamic acid must be avoided. 

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See also in sourсe #XX -- [ ]

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