Examination of interferences in the stripping voltammetric determination of trimethyllead in seawater by polarography and mercury-199 and lead-207 nuclear magnetic resonance spectrometry

Journal Article · Thu Nov 01 00:00:00 EST 1984 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00277a030· OSTI ID:5717136

Bond, A M; Bradbury, J R; Hanna, P J; Howell, G N; Hudson, H A; Strother, S; O'Connor, M J

Detailed investigations using polarography and pulse Fourier transform multinuclear magnetic resonance spectrometry show that mercury(II) ions react with trimethyllead cations in seawater and other aqueous media according to the equation Hg/sup 2 +/ + ((CH/sub 3/)/sub 3/Pb)/sup +/..-->..CH/sub 3/Hg/sup +/ + Pb/sup 2 +/ + 2CH/sub 3/. This reaction may invalidate proposed methods for determining trimethyllead by anodic stripping voltammetry at a glassy carbon electrode (in situ deposition of mercury) since mercury(II) ions are added in relatively high concentrations to the sample solution as part of the analytical procedure. While stripping techniques at the hanging mercury drop electrode do not suffer from this kind of interference, under oxygen-free conditions, transalkylation reactions at the electrode surface interfere with the direct determination of ((CH/sub 3/)/sub 3/Pb)/sup +/ in the presence of inorganic Pb(II) and double standard addition experiments are required to simultaneously determine both forms of lead. These experiments are inherently inaccurate and chromatographic or other separation techniques are recommended as a precursor for determing ((CH/sub 3/)/sub 3/Pb)/sup +/ in the presence of inorganic Pb(II).

• Research Organization: Deakin Univ., Victoria, Australia
• OSTI ID: 5717136
• Journal Information: Anal. Chem.; (United States), Vol. 56:13
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
LEAD
NMR SPECTRA
POLAROGRAPHY
ORGANOMETALLIC COMPOUNDS
SEAWATER
QUANTITATIVE CHEMICAL ANALYSIS
EXPERIMENTAL DATA
LEAD 207
LEAD COMPOUNDS
MERCURY 199
MERCURY COMPOUNDS
CHEMICAL ANALYSIS
DATA
ELEMENTS
EVEN-ODD NUCLEI
HEAVY NUCLEI
HYDROGEN COMPOUNDS
INFORMATION
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD ISOTOPES
MERCURY ISOTOPES
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
WATER
400102* - Chemical & Spectral Procedures
400104 - Spectral Procedures- (-1987)
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)