A simple optimized microwave digestion method for multielement monitoring in mussel samples

被引:21
作者
Saavedra, Y
González, A
Fernández, P
Blanco, J
机构
[1] Ctr Control Medio Marino, Conselleria Pesca & Asuntos Maritimos, Vilaxoan, Spain
[2] Fac Quim, Dept Quim Analit Nutr & Bromatol, Santiago De Compostela 15706, Spain
[3] Ctr Invest Marinas, Conselleria Pesca & Asuntos Maritimos, E-36620 Vilanova de Arousa, Spain
关键词
metals; microwave digestion; closed vessels; atomic absorption spectrometry; mussel; monitoring;
D O I
10.1016/j.sab.2003.12.024
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
With the aim of obtaining a set of common decomposition conditions allowing the determination of several metals in mussel tissue (Hg by cold vapour atomic absorption spectrometry; Cu and Zn by flame atomic absorption spectrometry; and Cd, PbCr, Ni, As and Ag by electrothermal atomic absorption spectrometry), a factorial experiment was carried out using as factors the sample weight, digestion time and acid addition. It was found that the optimal conditions were 0.5 g of freeze-dried and triturated samples with 6 ml of nitric acid and subjected to microwave heating for 20 min at 180 psi. This pre-treatment, using only one step and one oxidative reagent. was suitable to determine the nine metals studied with no subsequent handling of the digest. It was possible to carry out the determination of atomic absorption using calibrations with aqueous standards and matrix modifiers for cadmium. lead. chromium. arsenic and silver. The accuracy of the procedure was checked using oyster tissue (SRM 1566b) and mussel tissue (CRM 278R) certified reference materials. The method is now used routinely to monitor these metals in wild and cultivated mussels, and found to be good. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:533 / 541
页数:9
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