García-Rico L, Ramos Ruiz R E, Jiménez J V
Centro de Investigación en Alimentación y Desarrollo, Department of Food Science, Hermosillo, Sonora, Mexico.
J AOAC Int. 2001 Nov-Dec;84(6):1909-13.
Bivalves such as oysters often accumulate heavy metals, and therefore can be used to monitor changes of pollutant concentrations in the environment. Cultivated oysters from the northwest coast of Mexico are widely used for human consumption and thus have an important commercial value. Information was gathered on the concentration of these elements in oysters (Crassostrea gigas) cultivated on the coast of Sonora. Oysters were randomly collected from April to October 1997, from 6 different locations (65 individuals per site) in 4 different months. Metals were determined by microwave digestion followed by atomic absorption spectroscopy. The mean values (microg/g fresh weight) for each metal were: Cd, 0.76; Cu, 3.64; Zn, 17.71; Pb, 0.50; As, 0.05; Hg, 0.03; and Se, 0.21. The results show that, except for Cd, concentrations of regulated metals were under the maximum permitted values specified by regulatory agencies of Mexico and were comparable to those reported from other areas.
诸如牡蛎之类的双壳贝类通常会积累重金属，因此可用于监测环境中污染物浓度的变化。墨西哥西北海岸养殖的牡蛎广泛用于人类食用，因而具有重要的商业价值。收集了关于索诺拉海岸养殖的牡蛎（太平洋牡蛎）中这些元素浓度的信息。1997年4月至10月期间，从4个不同月份的6个不同地点（每个地点65只个体）随机采集牡蛎。通过微波消解然后用原子吸收光谱法测定金属含量。每种金属的平均值（微克/克鲜重）为：镉，0.76；铜，3.64；锌，17.71；铅，0.50；砷，0.05；汞，0.03；硒，0.21。结果表明，除镉外，受管制金属的浓度低于墨西哥监管机构规定的最大允许值，并且与其他地区报告的浓度相当。
