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Determination of lead in aqueous samples as the tetramethyl derivative by atomic absorption spectrometry.

Authors
Brueggemeyer-TW; Caruso-JA
Source
Anal Chem 1982 May; 54(6):872-875
NIOSHTIC No.
00185854
Abstract
A method was presented for the determination of lead (7439921) in aqueous samples. Lead was extracted into chloroform as the dithiocarbamate complex followed by solvent evaporation and methylation of the residue with methyllithium to form tetramethyllead. A short column of Porapak-Q was used to trap the analyte vapor which was eluted from the column into a quartz furnace atomic absorption detector. At the 50 nanograms/milliliter (ng/ml) level a relative standard deviation of 6.8 percent was obtained. The detection range was from 5 to 200ng. The accuracy of the method was tested using Environmental Protection Agency samples. When running these samples it was necessary to use ammonium-pyrrolidine- dithiocarbamate as the chelating agent as sodium- diethyldithiocarbamate readily decomposed in acidic solutions. Ammonium-pyrrolidine-dithiocarbamate works equally well, but is slow to dissolve in water. No significant changes were noted in the slope or linearity of the calibration curve with this change in chelating agent. The authors conclude that the results show that an extraction/methylation/trapping procedure is a viable approach to lead determination.
Keywords
NIOSH-Publication; NIOSH-Grant; Grants-other; Analytical-methods; Chemical-analysis; Analytical-chemistry; Lead-compounds; Atomic-absorption-spectrometry
Contact
Chemistry University of Cincinnati Department of Chemistry Cincinnati, Ohio 45221
CODEN
ANCHAM
CAS No.
7439-92-1
Publication Date
19820501
Document Type
Journal Article
Funding Amount
155319.00
Funding Type
Grant
Fiscal Year
1982
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00739
Issue of Publication
6
Priority Area
Other Occupational Concerns; Grants-other
Source Name
Analytical Chemistry
State
OH
Performing Organization
University of Cincinnati, Cincinnati, Ohio
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