On-line photoassisted vapour generation implemented in an automated flow-injection/stopped-flow manifold coupled to an atomic detector for determination of selenium

被引:30
作者
Garcia, M. [1 ]
Figueroa, R. [1 ]
Lavilla, I. [1 ]
Bendicho, C. [1 ]
机构
[1] Univ Vigo, Fac Quim, Area Quim Analit, Dept Quim Analit & Alimentaria, Vigo 36200, Spain
关键词
D O I
10.1039/b601650b
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A flow-through UV reactor has been implemented in an automated flow-injection/stopped-flow manifold, and used for on-line generation of Se volatile derivatives prior to detection by quartz furnace atomic absorption spectrometry. The presence of a low molecular weight organic acid (formic or acetic) in the carrier was a necessary requirement so that efficient vapour generation was achieved. Stopped-flow conditions were employed with the aim of increasing the time for which the sample zone was subjected to UV irradiation while it was transported to the detector. The simultaneous formation of H-2 during the photochemical decomposition of formic acid facilitated the atomization of the Se derivatives in the quartz furnace, and therefore the addition of H-2 to the carrier gas, which is necessary for efficient atomisation, could be eliminated. Nevertheless, the presence of H-2 in the carrier gas (Ar) was required for efficient atornisation when using acetic acid as carrier. This manifold allowed a sample throughput of 26 h(-1) with a detection limit of 0.5 ng mL(-1) Se and a repeatability, expressed as relative standard deviation, of 4%. Effect of concomitants in the online generation of Se vapours with the new manifold was investigated. Chloride salts of alkaline and alkaline-earth elements did not interfere at concentrations up to 10 000 mg L-1, but nitrate salts caused a positive effect. Tolerance of typical hydride-forming elements such as As and Sn was much higher with UV vapour generation as compared to chemical hydride generation. The presence of Cu(n) was critical since interference effects are observed from 0.05 mg L-1, but tolerance of Ni(ii) was greater with UV vapour generation.
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收藏
页码:582 / 587
页数:6
相关论文
共 37 条
[11]   UV photosynthesis of nickel carbonyl [J].
Guo, XM ;
Sturgeon, RE ;
Mester, Z ;
Gardner, G .
APPLIED ORGANOMETALLIC CHEMISTRY, 2004, 18 (05) :205-211
[12]   Vapor generation by UV irradiation for sample introduction with atomic spectrometry [J].
Guo, XM ;
Sturgeon, RE ;
Mester, Z ;
Gardner, GJ .
ANALYTICAL CHEMISTRY, 2004, 76 (08) :2401-2405
[13]   UV light-mediated alkylation of inorganic selenium [J].
Guo, XM ;
Sturgeon, RE ;
Mester, Z ;
Gardner, GJ .
APPLIED ORGANOMETALLIC CHEMISTRY, 2003, 17 (08) :575-579
[14]   UV vapor generation for determination of selenium by heated quartz tube atomic absorption spectrometry [J].
Guo, XM ;
Sturgeon, RE ;
Mester, Z ;
Gardner, GJ .
ANALYTICAL CHEMISTRY, 2003, 75 (09) :2092-2099
[15]   Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants [J].
Herrmann, JM .
CATALYSIS TODAY, 1999, 53 (01) :115-129
[16]   FACTORS INFLUENCING SENSITIVITY AND ACCURACY FOR THE DETERMINATION OF ALKYLSELENIDES AND TETRAALKYLLEAD COMPOUNDS BY GAS-CHROMATOGRAPHY ATOMIC-ABSORPTION SPECTROMETRY [J].
JIANG, SG ;
CHAKRABORTI, D ;
ADAMS, F .
ANALYTICA CHIMICA ACTA, 1987, 196 :271-275
[17]   Conformational memory in photodissociation of formic acid [J].
Khriachtchev, L ;
Maçôas, E ;
Pettersson, M ;
Räsänen, M .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (37) :10994-10995
[18]   Applied studies in solar photocatalytic detoxification:: an overview [J].
Malato, S ;
Blanco, J ;
Vidal, A ;
Alarcón, D ;
Maldonado, MI ;
Cáceres, J ;
Gernjak, W .
SOLAR ENERGY, 2003, 75 (04) :329-336
[19]   PHOTOREDUCTION OF MANGANESE-DIOXIDE IN SEAWATER BY ORGANIC-SUBSTANCES UNDER ULTRAVIOLET OR SUNLIGHT [J].
MATSUNAGA, K ;
OHYAMA, T ;
KUMA, K ;
KUDO, I ;
SUZUKI, Y .
WATER RESEARCH, 1995, 29 (02) :757-759
[20]   THE DETERMINATION OF TIN IN STEEL SAMPLES BY FLOW-INJECTION HYDRIDE GENERATION ATOMIC-ABSORPTION SPECTROSCOPY [J].
MCINTOSH, S ;
LI, Z ;
CARNRICK, GR ;
SLAVIN, W .
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1992, 47 (07) :897-906