Microwave-assisted digestion of organoarsenic compounds for the determination of total arsenic in aqueous, biological, and sediment samples using flow injection hydride generation electrothermal atomic absorption spectrometry

Abstract A procedure has been developed for determination of total arsenic and selenium in soils and plants by atomic absorption spectrometry with hydride generation associated with flow injection analysis (FIA-AAS-HG). Samples were wet-digested by using 2 systems: heating in a metal digestion block with controlled temperature and time and heating in a microwave oven. Total arsenic and selenium were reduced with NaBH4 and concentrated HCI, respectively. In both digestion systems used for the 2 matrix types, detection limits below 1 μg/L were found for both elements for an injection volume of 160 μL, with relative standard deviations of 3–6%. Recoveries by the method ranged from 93 to 105%; with the reference materials FD8 and MRG-1, the values obtained in all cases were consistent with the certified data. The FIA-AAS-HG procedure is highly suitable for determination of total arsenic and selenium in soils and plants, and because of the coupled system used, it is an improvement over other procedures in terms of sample treatment, sample consumption, and automation.

Download Full-text

Investigations Into the Role of Modifiers for Entrapment of Hydrides in Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry as Exemplified by the Determination of Germanium

Journal of Analytical Atomic Spectrometry ◽

10.1039/a607478b ◽

1997 ◽

Vol 12 (5) ◽

pp. 585-588 ◽

Cited By ~ 10

Author(s):

BO HILLIGSØE ◽

JENS E. T. ANDERSEN ◽

ELO H. HANSEN

Keyword(s):

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Flow Injection ◽

Electrothermal Atomic Absorption Spectrometry ◽

Hydride Generation ◽

Absorption Spectrometry

Download Full-text

Determination of Arsenic in Scalp Hair Samples from Exposed Subjects Using Microwave-Assisted Digestion With and Without Enrichment Based on Cloud Point Extraction by Electrothermal Atomic Absorption Spectrometry

Journal of AOAC International ◽

10.1093/jaoac/94.1.293 ◽

2011 ◽

Vol 94 (1) ◽

pp. 293-299 ◽

Cited By ~ 13

Author(s):

Tasneem Gul Kazi ◽

Jameel Ahmad Baig ◽

Abdul Qadir Shah ◽

Ghulam Abbas Kandhro ◽

Sumaira Khan ◽

...

Keyword(s):

Atomic Absorption Spectrometry ◽

Cloud Point Extraction ◽

Scalp Hair ◽

Electrothermal Atomic Absorption Spectrometry ◽

Absorption Spectrometry ◽

Microwave Assisted ◽

Hair Samples ◽

Triton X ◽

Microwave Assisted Digestion

Abstract A simple and rapid cloud point extraction (CPE) procedure was applied for preconcentration of trace quantities of arsenic (As) in scalp hair samples. The samples were subjected to microwave-assisted digestion in a mixture of nitric acid and hydrogen peroxide (2 + 1, v/v) prior to preconcentration by CPE. The As in digested samples was complexed with ammonium pyrrolidine dithiocarbamate (APDC), and the resultant As-PDC complex was extracted by a nonionic surfactant, octylphenoxypolyethoxyethanol (Triton X-114). After centrifugation, the surfactant-rich phase was diluted with 0.1 M HNO3 in methanol and analyzed by electrothermal atomic absorption spectrometry. The experimental parameters, i.e., amount of APDC, concentration of Triton X-114, equilibrium temperature and time, were optimized. For validation of the proposed method, a certified reference material (CRM) of human hair (BCR 397) was used. No significant difference (P>0.05) was observed between the experimental results and certified values of the CRM (paired t-test). The LOD and LOQ obtained under the optimal conditions were 0.025 and 0.083 μg/kg, respectively. The developed method was applied for the determination of As in scalp hair samples from male and female subjects of two villages of Khairpur Mir's, Pakistan.

Download Full-text