Hydride generation atomic absorption determination of arsenic in marine sediments, tissues and sea water with in situ concentration in a graphite furnace

Abstract

Methods are described for the determination of total As in sea water and in marine tissues and sediments based on the generation of AsH3 using NaBH4 with its subsequent trapping in a graphite furnace at 600 "C. Calibration is achieved with a simple aqueous calibration graph having a sensitivity of 0.18 k 0.03A ng-1 and yields an absolute detection limit of 40 pg. Sample volumes of 10-500 pl produce total method concentration detection limits (3a blank) of 60 pg 9-1 in sea water, 0.2 pg g-1 in sediments and 0.15 pg 9-1 in tissues.Corresponding precisions of 2-3% are typical for analyses of these samples. Results are reported for the determination of As in a suite of marine reference materials.

Investigation of the automated determination of As, Sb and Bi by flow-injection hydride generation using in-situ trapping on stable coatings in graphite furnace atomic absorption spectrometry

“…Sturgeon et al [2][3][4] used hydride introduction through the injection hole of the graphite tube via a manually inserted quartz capillary in their investigation of the in situ trapping of As, Sb and Bi. A large absorber surface area was required for the sequestering of hydrides on the bare tube wall [4].…”

Atomic absorption determination of lead at picogram per gram levels by ethylation with in-situ concentration in a graphite furnace

“…Although the possibilities of Pb2+ contamination * Author to whom all correspondence should be addressed. are much greater than for the alkyllead species, its ease of ethylation and the absence of significant sample manipulation make this approach attractive for coupling with in situ concentration and atomization procedures using a graphite furnace (15)(16)(17)(18)(19). The latter offers substantial advantages over conventional purge and trap methodologies with furnace or heated quartz cell detection systems including simplicity of operation and use of small sample volumes, high sensitivity, and a substantial increase in detection power.…”

A geração química de vapor em espectrometria atômica

“…Desde então, foram publicados vários trabalhos [73][74][75][76] , inclusive com a adição prévia à captura de hidretos, de modificadores, permanentes ou não [76][77][78][79][80][81][82][83][84] . Estudos de especiação também são relatados 85 .…”