期刊
FOOD CHEMISTRY
卷 246, 期 -, 页码 379-385出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.11.050
关键词
Emulsification; Dispersive liquid-liquid microextraction; Speciation of chromium; Electrothermal atomic absorption spectrometry; Water samples; Rice samples
资金
- department of chemistry and research center for academic excellence in petroleum petrochemical and advanced materials, faculty of science, Naresuan University, Thailand
A novel method was developed by SAE-DLLME for chromium speciation in water and rice samples using 2-thenoyltrifluoroacetone (TTA) as a chelating reagent by ETAAS. The speciation of Cr(III) and Cr(VI) was achieved by complexation of Cr(III)-TTA and the total Cr was measured after reduction of Cr(VI) to Cr. The calibration graph was linear in the range of 0.02-2.50 mu g L-1, with a detection limit of 0.0052 mu g L-1. The % RSD was in range of 2.90-3.30% at 0.5, 1.5 and 2.5 mu g L-1 of Cr(III), n = 5 and the EF was 54.47. The method was applied to chromium speciation and total chromium determination in real samples and gave recoveries in the range of 96.2-103.5% and 97.1-102.7% for Cr(III) and Cr(VI) in water samples and 93.7-103.5% of total Cr in rice samples. The accuracy of the method was evaluated by analysis of SRM 1573a with good agreement compared to the certified value.
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