Determination of cadmium in herbs by SFODME with ETAAS detection

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• 作者：Arnon Thongsaw^a ; Wipharat Chuachuad Chaiyasith^a ; ^{wipharatc@nu.ac.th" class="auth_mail" title="E-mail the corresponding author} ; Ratana Sananmuang^a ; Gareth M. Ross^a ; Richmond J. Ampiah-Bonney^b
• 关键词：Solidified floating organic drop microextraction ; Electrothermal atomic absorption spectrometry ; 1-(2-Pyridylazo)-2-naphthol (PAN) ; Cadmium ; Herbs
• 刊名：Food Chemistry
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：219
• 期：Complete
• 页码：453-458
• 全文大小：378 K

文摘

A method for the determination of cadmium in herb samples based on solidified floating organic drop microextraction (SFODME) using 1-(2-Pyridylazo)-2-naphthol (PAN) as a chelating reagent and detection by electrothermal atomic absorption spectrometry (ETAAS) was developed in the present work. The effects of pH, extraction solvent, extraction time, stirring rate, and extraction temperature were investigated. Under the optimized conditions, the calibration graph was linear in the range of 0.017–3.0 μg L⁻¹, with a detection limit (LOD) of 0.0052 μg L⁻¹. The relative standard deviation (%RSD) for 6 replicate measurements of 1.0 μg L⁻¹ cadmium was ±2.67%. The method was applied to the analysis of 10 types of Thai herb samples. Percentage recoveries were in the range 94.5–110.2%. It was found that cadmium concentrations in all Thai herb samples were less than the maximum residue level.