title: Speciation of ionic alkyllead compounds in human urine by gas chromatography-mass spectrometry after butylation through a Grignard reaction.
abstract: One analytical procedure for the determination of ionic alkyllead in human urine has been studied. The system consists of the extraction of Me3Pb+, Et3Pb+ and Pb2+ at pH 9.0 with diethyldithiocarbamate to an organic phase. Then, the ionic compounds are butylated with BuMgCl and the final organic solution is analyzed by GC-MS-SIM. The elimination of both foam and gels in the extraction step and the general procedure for the urine are discussed. The recovery of compounds ranges from 105.1% for Me3Pb+ to 97.2% for Et3Pb+ using hexane as extracting agent and detection limits are 18.4 pg/ml of Me3Pb+ and 19.2 pg/ml of Et3Pb+ in urine. The speciation of ionic alkylleads in the urine of a petrol station worker showed a value of 27.9 pg/ml of Me3Pb+ in urine and Et3Pb+ was below the detection limit.
authors.affiliation: Departmento Química Analítica, Universidad de La Rioja, Logroño, Spain. begona.pons@dq.unirioja.es
authors.forename: B
authors.initials: B
authors.lastname: Pons
authors.forename: A
authors.initials: A
authors.lastname: Carrera
authors.forename: C
authors.initials: C
authors.lastname: Nerín
mesh_terms: D000431:Ethanol; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D007202:Indicators and Reagents; D007854:Lead / Q000652:urine*; D009942:Organometallic Compounds / Q000652:urine*; D010420:Pentanes; D000439:Pentanols; D013756:Tetraethyl Lead / Q000031:analogs & derivatives* / Q000652:urine
chemical_list: D007202:Indicators and Reagents; D009942:Organometallic Compounds; D010420:Pentanes; D000439:Pentanols; D013756:Tetraethyl Lead; D007854:Lead; D000431:Ethanol; C033353:pentane; C010360:triethyllead; C116997:butylmagnesium chloride; C039474:trimethyllead; C029683:isopentyl alcohol