Ammonium pyrolidine dithiocarbamate

Water Direct introduction of water or of extract following extraction of water with methyl isobutyl ketone containing ammonium pyrolidine dithiocarbamate. AAS (Standard Method 3111 0.5 mg/L at 283.3 nm No data (%RSD = 4.7 for direct 23.5 for extract) Eaton et al. 1995b... 

AAS = atomic absorption spectroscopy APDC = ammonium pyrolidine dithiocarbamate ASV = anodic stripping voltammetry CCI4 = carbon tetrachloride DTPA =... 

Filterable metal may be analysed directly by AAS. Except in highly polluted waters, the use of flameless techniques will be necessary and research has shown that reliable results are obtained only by use of the method of standard additions to minimize matrix interferences. The sensitivity of flame methods may be enhanced if the lead is preconcentrated by extraction with ammonium pyrolidine dithiocarbamate in methyl isobutyl ketone (APDC/MIBK). This also eliminates many interferences, but prior heating of the sample with acid may be necessary to release complexed lead [8]. The use of ASV for analysis of filterable lead in water is rather more complex than might appear at first sight, since ASV is only sensitive to labile (weakly-bound) lead, and not to that strongly bound in complexes. Reduction of the sample pH by addition of an appropriate acid may cause release of most of the lead enabling analysis to be carried out. In general, AAS is to be preferred. 

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