Water organolead compounds

Heisterkamp, M., DeSmaele, T., Candelone, J.E, Moens, L., Dams, R. and Adam, F.C. (1997) Inductively coupled plasma mass spectrometry hyphenated to capillary gas chromatography as a detection system for the speciation of organolead compounds in environmental waters./. Anal. At. Spectrom., 12, 1077-1081. 

Investigations of lead speciation in various environmental samples have relied upon gas and liquid chromatographic separations coupled to mass spectrometric and atomic absorption spectrometric detectors. The combination of atomic absorption spectrometry with gas chromatography (GC-AAS) has proved to be the most widely applied technique. Sample types have included air, surface water, air particulates, sediments, grass, and clinical materials such as blood. A review of speciation analyses of organolead compounds by GC-AAS, with emphasis on environmental materials, was published (Lobinski et al., 1994). 

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. 

Other applications of gas chromatography to the determination of organolead compounds in non saline waters are discussed in Table 15.17. 

With few exceptions, organolead compounds are sufficiently stable to air, water and fight to permit their safe handling without any unusual procedures. Because of toxicity considerations, however, organolead compounds should always be handled in well-ventilated hoods. (See Section 8). 

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],... 

After homogenization of a dried sample, the organolead compounds are extracted in the same way as these are removed from the water phase tetraalkyUead species are quantitatively extracted from water saturated with NaCl into a smaller amount of organic solvent, while for ionic alkyllead species chelating agents strongly improve the extraction efficiency. For biological materials the extraction is often preceded by a hydrolysis step with either TMAH or enzymes. 

MS HPLC HPLC-heated nebulizer-ESI source Compound-specific LOD e.g., 10 pg 1 organolead compounds in water Commercial systems 430... 

The massive use of lead in kitchen utensils and water pipes goes back to the period of the Roman Empire. Later on, the industrial revolution promoted its use on a global scale. However, it was the discovery of the antiknocking properties of the organolead compounds and the fast development of the auto industry in the last century that turned lead contamination... 

The concentrations of organolead compounds found in the different environmental compartments are often in the pgm, ngl , and ng per g levels for air, water, and sediment and biological tissues, respectively. However, inorganic lead forms can simultaneously be present in the same samples at a 1000-fold higher level. For this reason, the instrumentation necessary to carry out lead speciation analysis in real samples requires the isolation, separation, and sensitive detection of the individual organolead species in the presence of thousands of... 

Metallic lead is soft, bluish white, highly malleable, and ductile. It is a poor conductor of heat and electricity and resistant to corrosion. A protective film of basic carbonate is formed on the surface of lead exposed to moist air. Lead reacts with water in the presence of air to form lead hydroxide. Inorganic Pb(II) compounds are mainly insoluble or slightly soluble in water. Exceptions are lead chlorate, perchlorate, nitrate, and acetate. Lead chloride is moderately soluble (9.9 g/liter at 20°C). The most important organolead compounds are tetramethyllead and tetraethyllead used as antiknock additives in fuel. Both are colorless liquids at room temperature with boiling points 110 and 200°C, respectively. Photolytically these degrade to RaPb , R2Pb , and Pb. The different chemical forms of lead have different toxicity, so that speciation information is important [1,2]. 

Organolead compounds are pollutants in air, water, soil, and sediments. The toxicity of organolead species depends on the organic groups bound to the Pb atom. Lead has four stable isotopes ( Pb, Pb, Pb, and Pb) and isotopic analysis of Pb can be used for geological dating and to track environmental processes and sources of Pb species. 

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