Determination of arsenic in peat samples using HG-AFS and l-cysteine as pre-reductant

Literature Information

Publication Date 2005-12-22
DOI 10.1039/B514268G
Impact Factor 4.023
Authors

Jutta Frank, Michael Krachler, William Shotyk


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Abstract

An accurate, sensitive, and robust analytical procedure for the direct determination of arsenic (As) in nitric acid digests of peat samples using hydride generation-atomic fluorescence spectrometry (HG-AFS) has been developed. Existing HG-AFS procedures developed for other environmental matrices employing potassium iodide (KI) as pre-reductant cannot be applied for the determination of As in peat samples, because they largely underestimate the actual As concentration. Here, the pre-reduction capabilities of KI and L-cysteine in nitric acid digests of peat and plant samples were tested systematically, revealing that only L-cysteine (12.8 g l−1) provided accurate results for peat samples. The newly developed analytical procedure was successfully applied to the determination of As in several peat samples and peat reference materials with concentrations ranging from ∼100 ng g−1 to ∼10000 ng g−1, as well as certified environmental reference materials yielding good agreement between found and certified values. The LOD of 4 ng l−1 and the precision of <3% for peat samples allowed the reliable quantification of As in all investigated peat samples. Results for As in selected peat samples obtained using the new HG-AFS procedure were confirmed in-house using ICP-SF-MS and HG-AAS.

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Journal of Analytical Atomic Spectrometry

Journal of Analytical Atomic Spectrometry
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The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.

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