Organolead compounds, derivatization

Determination of Pb(II) and organolead compounds in human urine, after LLE of the complexes with 91 and derivatization Et4Pb as internal standard . The aqueous solution is evaporated to dryness, the sohd residue is derivatized and the alkylated Pb was evaporated into an ETAAS instrument the LOD (SNR 2) was 7 ppb . 

Schubert, P., E. Rosenberg, and M. Grasserbauer. 2000. Comparison of sodium tetraethylborate and sodium tetra(n-propyl)borate as derivatization reagent for the speciation of organotin and organolead compounds in water samples. Fresenius J. Anal. Chem. 366 356-360. 

MIP-AED GC GG-heated transfer line-AED pg element P e.g., 2pgkg butyltin in sediment 0.01-0.03 pgkg organolead compounds in peat Commercial systems detector based on atomic emission non-volatile compounds require derivatization 417,421... 

Prior to their separation by GC, organolead compounds need to be extracted from the sample matrix and, if necessary, derivatized into a volatile and thermally stable form. Volatile nonpolar tetraalkyl compounds can be extracted from environmental samples with nonpolar solvents such as benzene or hexane and injected directly onto the gas chromatograph. The case of nonvolatile, ionic alkyl compounds (R2Pb and RsPb ) is more complex. They should first be extracted and preconcentrated in the presence of NaCl and sodium diethyldithiocarbamate and then derivatized into a volatile form. The most widespread derivatization methods are of two distinct types those based on the use of tetraalkylborates that can be directly performed in the aqueous solution (ethylation and propylation) and those applying... 

In order to shorten the sample preparation steps, the use of a flow injection (FI) system for the continuous preconcentration of organolead compounds has been studied. It is based on a Cgo fullerene sorbent column and derivatization of the eluent analytes using a Grignard reagent prior to measurement by GC-MS. 

Several efforts have been carried out to develop a new aqueous derivatization reagent. Phenylation with sodium tetraphenylborate is a promising procedure for the speciation of several metals. Its application for organomercury analysis has been comprehensively studied [10]. Sodium tetrapropylborate is another reagent that has been investigated for determining organolead, tin, and mercury compounds [1]. However, its application is limited because it is not commercially available. 

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