Issue 4, 2016

UV-assisted Fenton digestion of rice for the determination of trace cadmium by hydride generation atomic fluorescence spectrometry

Abstract

A new digestion method using UV-assisted Fe0 Fenton reaction was developed for the determination of trace Cd in rice by hydride generation atomic fluorescence spectrometry. The proposed method integrated the advantages of simplicity, small dose of reagents, low cost and moderate reaction conditions, and was successfully utilized to analyze a Certified Reference Material (CRM) and real rice samples. A 1 mL mixture of the sample and reagents (0.0500 g rice powder, 0.2% (m/v) Fe0, 0.75% (v/v) HNO3 and 18% (v/v) H2O2) was irradiated by UV-light for 50 min and then a clear solution was obtained by separating excess Fe0 with a magnet prior to spectral analysis. The limit of detection (LOD) for Cd was found to be 0.02 mg kg−1 and the relative standard deviation was better than 5.0% at a concentration level of 0.40 mg kg−1. The recovery obtained by analyzing the CRM was 103% and spiked recoveries with 0.40 mg kg−1 Cd in rice samples were 93% and 101%. The t-test proved that there is no significant difference between the certified value and the determined value of the CRM, and between the proposed method and microwave-assisted digestion coupled with inductively coupled plasma mass spectrometry (MWD-ICP-MS) at 95% confidence level.

Graphical abstract: UV-assisted Fenton digestion of rice for the determination of trace cadmium by hydride generation atomic fluorescence spectrometry

Article information

Article type
Paper
Submitted
07 Oct 2015
Accepted
27 Dec 2015
First published
04 Jan 2016

Analyst, 2016,141, 1512-1518

UV-assisted Fenton digestion of rice for the determination of trace cadmium by hydride generation atomic fluorescence spectrometry

H. Yu, X. Ai, K. Xu, C. Zheng and X. Hou, Analyst, 2016, 141, 1512 DOI: 10.1039/C5AN02068A

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