Electrothermal atomization of palladium stabilized selenium in the presence of phosphate

被引：7

作者：

Fischer, JL ^{[1
]}

机构：

[1] Rand Afrikaans Univ, Dept Chem Biochem, ZA-2006 Auckland Pk, South Africa

来源：

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2002年 / 57卷 / 03期

关键词：

ETA-AAS; Se; atomization kinetics; activation energy; palladium nitrate modifier; reduced palladium modifier; phosphate interference;

D O I：

10.1016/S0584-8547(01)00409-8

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The interference caused by phosphate (as Na2HPO4) in the electrothermal atomic absorption determination of selenium was investigated for reduced and unreduced palladium nitrate modifiers. An increase of the amount of phosphate in the sample was accompanied with increasing losses of selenium. Kinetic parameters of the selenium atomization were calculated for various amounts of phosphate interference. These results were compared with previous findings for palladium stabilized selenium and the sulfate interference observed for this system. The increasing chemical interference is due to phosphorous replacing the selenium bound by palladium. The phosphorus thus makes the palladium surface unavailable for the stabilization of selenium. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：525 / 533

页数：9

共 21 条

[1] DETERMINATION OF SELENIUM IN BIOLOGICAL-MATERIALS WITH PLATFORM FURNACE ATOMIC-ABSORPTION SPECTROSCOPY AND ZEEMAN BACKGROUND CORRECTION [J].

CARNRICK, GR ;

MANNING, DC ;

SLAVIN, W .

ANALYST, 1983, 108 (1292) :1297-1312

[2] MASS-SPECTRAL AND ATOMIC-ABSORPTION STUDIES OF SELENIUM VAPORIZATION FROM A GRAPHITE SURFACE [J].

DROESSLER, MS ;

HOLCOMBE, JA .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1987, 42 (08) :981-994

[3] BACKGROUND CORRECTION IN ATOMIC-ABSORPTION UTILIZING THE ZEEMAN EFFECT [J].

FERNANDEZ, FJ ;

MYERS, SA ;

SLAVIN, W .

ANALYTICAL CHEMISTRY, 1980, 52 (04) :741-746

[4]

FERNANDEZ FJ, 1982, ATOM SPECTROSC, V3, P61

[5] Kinetics of selenium atomization in electrothermal atomization atomic absorption spectrometry (ETA-AAS). Part 3: Chemical interference of sulphate using palladium modifiers [J].

Fischer, JL ;

Rademeyer, CJ .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1999, 54 (06) :975-983

[6] Kinetics of selenium atomization in electrothermal atomization atomic absorption spectrometry (ETA-AAS). Part I: selenium without modifiers [J].

Fischer, JL ;

Rademeyer, CJ .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1998, 53 (04) :537-548

[7] Kinetics of selenium atomization in electrothermal atomization atomic absorption spectrometry (ETA-AAS). Part 2: selenium with palladium modifiers [J].

Fischer, JL ;

Rademeyer, CJ .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1998, 53 (04) :549-567

[8]

FRECH W, 1985, PROG ANAL ATOM SPECT, V8, P257

[9] INVESTIGATION OF HIGH-TEMPERATURE REACTIONS ON SOLID SUBSTRATES WITH RUTHERFORD BACKSCATTERING SPECTROMETRY - INTERACTION OF PALLADIUM WITH SELENIUM ON HEATED GRAPHITE SURFACES [J].

MAJIDI, V ;

ROBERTSON, JD .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1991, 46 (13) :1723-1733

[10] MECHANISM OF MODIFICATION BY PALLADIUM IN GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY [J].

QIAO, HC ;

JACKSON, KW .

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 1991, 46 (14) :1841-1859

← 1 2 3 →