203Pb was used to monitor sample-preparation techniques used in four atomic absorption methods for determination of lead in blood. Sources of error and their magnitude were identified and measured for each of the following analytical procedures: precipitation with trichloroacetic acid, separation with ammonium pyrrolidine dithiocarbonate into methyl isobutyl ketone, digestion with acids, and co...

Recently it has been demonstrated that the amino acid, ornithine, is an efficient precursor of the pyrrolidine ring of nicotine in the tobacco plant (1,2). Although there is considerable evidence that ornithine and glutamie acid may give rise to the pyrrolidine ring of proline through a common intermediate in animal systems (3) and in microorganisms (4), there has been little study of this meta...

The design of new functional metal-semiconductor heteronanostructures with improved photovoltaic efficiencies has drawn significant attention because of their unprecedented properties and potential applications. Herein, we report a phase selective synthesis of ternary CuGaS2 (wurtzite and tetragonal) by simple solution based thermal decomposition of a new binuclear single molecular precursor [G...

Since the diamine putrescine can be metabolized into the pyrrolidine ring of tobacco alkaloids as well as into the higher polyamines, we have investigated the quantitative relationship between putrescine and these metabolites in tobacco callus cultured in vitro. We measured levels of free and conjugated putrescine and spermidine, and pyrrolidine alkaloids, as well as activities of the putresci...

Using cloud point extraction technology and the principle of absorbance addition in multi-component system, mixed metal ions Cr (III) Co (II) industrial wastewater were enriched determined at pH 5.0 50℃, using ammonium pyrrolidine dithiocarbamate (APDC) as complexing agent Triton X-114 extractant. The results indicate that contents can be calculated a simultaneous equation system. detection lim...