Simultaneous determination of trace concentrations of arsenic, antimony, bismuth, selenium and tellurium in aqueous solution by introduction of the gaseous hydrides into an inductively coupled plasma source for emission spectrometry. Part I. Preliminary studies

Abstract

A method has been developed for the simultaneous determination of arsenic, antimony, bismuth, selenium and tellurium by generation of their gaseous hydrides and introduction of these hydrides into an inductively coupled plasma source where the atomic line emission from the elements is detected. The effect of different plasma-torch assemblies on the detection limits attainable has been studied and suitable compromise conditions have been established for the simultaneous generation of the hydrides of the analyte elements and their determination by optical ernission spectrometry in t h e plasma source. Dctection limits of 1 ng ml-1 or below for aqueous solutions of the elements studied have been obtained under the conditions employed to allow their determination in samples of interest in geochemistry.Keywovds A rsenic, antimony, bismuth, seleniunz and tellurium detevminat i o n ; geochemical samples ; hydride generatiox. ; inductively coupled plasma etnission spectrometry

Determination of arsenic in a nickel alloy by flow injection hydride generation atomic absorption spectrometry

“…It is considered that a major factor in achieving this increased sensitivity is the reduced volume of the gas-liquid separator included as a hydride generation accessory in the FIAS 200 system. This gas-liquid separator has a total dead volume more than an order of magnitude less than some commonly used gas-liquid separators (27]. Thus, as the dilution in the gas phase is considerably less, the sensitivity for As(V) is enhanced almost an order of magnitude.…”

A geração química de vapor em espectrometria atômica

“…Para esses elementos, sua introdução na forma de hidretos torna-se uma alternativa atraente, pois o potencial de ganho na sensibilidade é proporcional à razão entre as eficiências de transporte dos dois sistemas, ou seja, 1 a 3% para a nebulização pneumática e até 100% no caso da geração de hidretos. Assim, Thompson et al 90,91 relataram o uso da geração de hidretos para a determinação de As, Bi, Se e Te por ICP-OES, tendo sido os hidretos continuamente gerados pela reação com o NaBH 4 , introduzidos diretamente no plasma e os elementos detectados simultaneamente. Deste modo, os limites de detecção melhoraram em, no mínimo, uma ordem de grandeza em relação à nebulização convencional.…”

“…Portanto, para evitar a extinção do plasma, Thompson et al 90,91 empregaram níveis relativamente altos de potência (2,7 -5,0 kW). Nesta ótica, sistemas de fluxo são preferidos aos de batelada, por produzirem, os primeiros, um fluxo constante destes subprodutos, o que permite a estabilização contínua do fundo, antes e depois da introdução do analito 12 .…”

Direct Simultaneous Determination for Ultratrace As, Se and Sb in River Water with Graphite-Furnace Atomic Absorpion Spectrometry by TiO2-Slurry Sampling

“…This technique coupled with many analytical instruments (such as HG-AAS, HG-ICP-AES and HG-ICP-MS etc.) has been applied in analytical field, [4][5][6][7][8] but it is necessary to keep the elements in solution in a low oxidization state and determination in the continuous mode. There have been a few lectures on in-situ trapping of hydrides on a graphite tube for ET-AAS.…”