Issue 9, 1999

Simultaneous determination of As, Hg, Se and Sb by hydride generation-microwave induced plasma atomic emission spectrometry after preconcentration in a cryogenic trap

Abstract

In this paper a system is presented which combines hydride generation with a preconcentration step in a cryogenic trap and detection using MIP-AES. The MIP has been operating at atmospheric pressure with a forward power of 30-150 W, using a TM 010 cavity (Beenakker resonator), equipped with a tangential flow torch design. The plasma emission was observed end-on by the means of a CCD camera coupled to a 0.5 m Czerny-Turner design monochromator. Metal hydrides were generated batchwise in aqueous medium, preconcentrated in a liquid nitrogen cryogenic trap and then evaporated by electrical heating into the plasma discharge. The optimum working conditions have been found at the 197±7 nm window working with a forward power of 130 W, a plasma gas flow rate of 270 ml min –1 of helium, a carrier gas flow rate of 134 ml min –1 of helium, a NaBH 4 concentration of 2% and a HNO 3 concentration of 0.66 M. Under these conditions detection limits of 2.0, 13, 2.2 and 3.3 µg L –1 for As, Hg, Se and Sb were achieved. The method was applied to the detemination of these analytes in spiked wastewater samples with recoveries of 95% or higher for all four analytes.

Article information

Article type
Paper

J. Anal. At. Spectrom., 1999,14, 1349-1355

Simultaneous determination of As, Hg, Se and Sb by hydride generation-microwave induced plasma atomic emission spectrometry after preconcentration in a cryogenic trap

C. Dietz, Y. Madrid, C. Cámara and P. Quevauviller, J. Anal. At. Spectrom., 1999, 14, 1349 DOI: 10.1039/A902039J

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