Metal speciation in the ppt range by HPLC and diode laser atomic absorption spectrometry in a flame

Citation
A. Zybin et al., Metal speciation in the ppt range by HPLC and diode laser atomic absorption spectrometry in a flame, ANALYT CHEM, 70(23), 1998, pp. 5093-5096
Citations number
10
Categorie Soggetti
Chemistry & Analysis","Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALYTICAL CHEMISTRY
ISSN journal
00032700 → ACNP
Volume
70
Issue
23
Year of publication
1998
Pages
5093 - 5096
Database
ISI
SICI code
0003-2700(199812)70:23<5093:MSITPR>2.0.ZU;2-N
Abstract
A simple, compact, and powerful instrument for metal speciation in the ppt range is described. The instrument includes a HPLC module for separation an d a diode laser for element-selective detection by wavelength modulation ab sorption spectrometry in an analytical name. The high detection power for m etal species is due to a two-beam arrangement with logarithmic amplificatio n of the normalized signal, which compensates the laser residual amplitude modulation noise, the offset, and its fluctuation, The analytical figures o f merit are demonstrated by measurements of very low concentrations of Cr(V I) in tap water.