| Autor: |
Chirita, Lucia, Frentiu, Tiberiu, Ponta, Michaela, Covaci, Eniko |
| Předmět: |
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| Zdroj: |
Analytical Letters; 2024, Vol. 57 Issue 10, p1526-1543, 18p |
| Abstrakt: |
A sensitive and interference-free method based on hydride generation high-resolution continuum source quartz tube atomic absorption spectrometry in dilute HCl was developed for total and inorganic As (tAs, iAs) determination in soil, sediments, and sludge. Sample preparation involved microwave-assisted digestion in aqua regia for tAs and extraction in 10 mol L−1 HCl for iAs. In both cases, the prereduction of As(V) to As(III) was carried out with L-cysteine, while derivatization to arsine with 0.6% NaBH4 was performed in the presence of 0.2% L-cysteine in 0.01 mol L−1 HCl (pH 2.00 ± 0.01). Inorganic arsenic determination was validated with 87 ± 7% extraction efficiency. The recovery of tAs in certified reference materials was 98 ± 23%, while the value for iAs in spiked samples was 95 ± 10%. The method was selective for iAs determination and did not require separation of iAs by liquid-liquid extraction in an organic solvent. The results were verified using the Tukeyʼs multiple comparison test for p > 0.05 (experimental values 0.063 to 0.999). The method is greatly simplified due to no requirement for the separation of iAs species, absence of spectral interference, similar derivatization conditions for tAs/iAs, and possibility of using external calibration. The limits of detection for tAs and iAs were 0.006 mg kg−1. Concentrations of 0.37–545 mg kg−1 tAs and 0.33–280 mg kg−1 iAs in real samples were determined with precisions from 3.7 to 12.2% and 6.8 to 15.0%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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