Determination of Heavy Metals in Some Types of Imported Fish from Local Markets

Wedad H. Al-Dahhan, Shayma M. Ahmad, Omran Mansour, J. Jebali, E. Yousif
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Abstract

Heavy metals can be considered in the aquatic environment as natural archaeological components and their quantities have risen as a result of industrial pollution. Heavy metals do not degrade over time and their concentrations can only rise due to bioaccumulation unlike organic contaminants. In the recent period, fish consumption has increased significantly because of its nutritional benefits, as it is a vital source of protein, as well as being high in critical vitamins and minerals. Because of the presence of heavy metals in frozen fish, it is a global public health issue concern but their presence remains essential and important for human physiological activities. However, when concentrations exceed the established allowed limits, they can be detrimental. The aim of this study was to quantify the concentration of heavy metals in frozen fish samples selected from Baghdad’s local markets. Six samples (Cleaned Shrimps, Anchovy Fillets, Captain Fisher Shrimps, Mackerel Fillets, Super Fresh Kalamar Squid and Frozen Rainbow Trout) of common brands of imported fish were selected from Iraqi markets in Baghdad. Acid digestion with a mixture of (65% HNO3 with 37% HCL) was carried out to free heavy metals fromfish samples to prepare solutions for testing in atomic absorption spectroscopy (AAS) device. The results reveal that the element concentrations in the selected samples (Cr, Co, Fe, Cu, Ni, K, Zn and Mg) are within the acceptable levels, and are lower than the permitted exposure limits according to international standards. It is remarkable to mention that the quantities of (Cd and Pb) are lower than permissible exposure limits of cadmium (0.2 mg/Kg) and lead (0.5 mg/Kg), implying that these imported items could be consumed safely.
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本港市场进口鱼类的重金属含量测定
重金属在水生环境中被认为是一种天然的考古成分,其数量由于工业污染而增加。重金属不会随着时间的推移而降解,与有机污染物不同,它们的浓度只会因生物积累而上升。最近一段时间,鱼类的营养价值显著增加,因为它是蛋白质的重要来源,而且富含重要的维生素和矿物质。由于冷冻鱼中存在重金属,这是一个全球性的公共卫生问题,但它们的存在对人类生理活动仍然是必不可少和重要的。然而,当浓度超过规定的允许限度时,它们可能是有害的。这项研究的目的是量化从巴格达当地市场挑选的冷冻鱼样本中重金属的浓度。从巴格达的伊拉克市场选取了6种常见品牌的进口鱼类样品(洗净虾、凤尾鱼片、船长虾、鲭鱼片、超级新鲜卡拉玛鱿鱼和冷冻虹鳟鱼)。采用65% HNO3和37% HCL的混合物进行酸消化,去除鱼样品中的重金属,制备用于原子吸收光谱(AAS)装置检测的溶液。结果表明,所选样品中的Cr、Co、Fe、Cu、Ni、K、Zn和Mg元素浓度均在可接受范围内,均低于国际标准的允许暴露限值。值得注意的是,(Cd和Pb)的数量低于镉(0.2毫克/公斤)和铅(0.5毫克/公斤)的允许接触限值,这意味着这些进口物品可以安全食用。
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