4.6 Article

Evaluation of different digestion systems for determination of trace mercury in seaweeds by cold vapour atomic fluorescence spectrometry

期刊

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2014.10.003

关键词

Mercury; Seaweeds; Food analysis; Digestion procedure; Cold vapour atomic fluorescence spectrometry; Sample pretreatment; Food safety; Heavy metal contamination of seafood; Food composition

向作者/读者索取更多资源

Four methods for acid digestion of seaweeds were compared in 10 commercially available seaweeds: (i) in stainless steel-Teflon (R) PTFE-bombs at high pressure and temperature, (ii) in closed-Teflon (R) PFA-vessels at high pressure and temperature, (iii) in open-polypropylene-tubes with reflux caps in a graphite heating block at high temperature and (iv) in closed-TFM (TM) PTFE-vessels with microwave-assisted controlled pressure and temperature. Hg was determined in all digests by cold vapour atomic fluorescence spectrometry (CV-AFS). Assessment of digestion methods was performed by comparison with the results obtained for total mercury determination by the Method EPA 7473, based on direct mercury analysis in the solid samples, and with a reference material BCR-279. The open vessel digestion system with reflux in a graphite heating block at high temperature constitutes the best choice since it was found to give the better Hg extraction (83-103%) as well as the lowest variability, being RSD < 10% for most of the studied seaweeds. A previous freeze-drying and intensive grinding was the best pretreatment. Similar results were obtained with and without the presence of oxidizing agents (KMnO4, K2Cr2O7) and with different tube-materials (borosilicate glass, PTFE and polypropylene). (C) 2014 Elsevier Inc. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据