State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Xianlin Campus, Nanjing, 210023, People's Republic of China.
Ecotoxicology. 2014 May;23(4):577-83. doi: 10.1007/s10646-014-1229-3. Epub 2014 Mar 27.
Fish is consumed as a common food by humans due to its nutritional and therapeutic benefits. However, they can accumulate toxic chemicals (such as heavy metals, persistent organic pollutants) from water and food chain. Very few studies have been investigated on heavy metal contents in fish from Tibetan Autonomous Region of China. In order to study heavy metals levels in fish from aquaculture farms and evaluate the risk that human consume fish in this area, we collected four types of aquaculture fish species (6 big-head carps, 5 grass carps, 5 carps and 5 tilapias) from fisheries around Lhasa city in this study. 9 heavy metals (Cr, As, Cd, Pb, Cu, Ba, Co, Mn and V) in different tissues of fish were determined by an inductively coupled plasma mass spectrometer. Cr, Ba, Co, Mn and V could easily accumulate in the gill, and Cu was detected in the hearts of all the fishes. Toxic metal (As, Cd and Pb) contents were higher in the liver than those in other tissues, heavy metal levels were the lowest in the muscle among all tissues. Most of heavy metal concentrations in the tilapia tissues were higher than those in other fish tissues, especially arsenic. Arsenic content in the tilapia samples was ~2-4 times higher than the maximum levels (MLs) of contaminants in the national standard, and other metals were all lower than the MLs. Compared the estimated daily intake of heavy metals through fish consumption with tolerable daily intakes recommended by FAO, the metals daily intake of As, Cd and Pb from fish consumption might not pose serious health risk to the local inhabitants. It is therefore necessary to determine the dose level for human, which is considered to be taken daily over a lifetime without adverse effects.
鱼类由于其营养价值和治疗功效而被人类作为常见食物食用。然而，它们会从水和食物链中积累有毒化学物质（如重金属、持久性有机污染物）。目前，仅有很少的研究调查了来自中国西藏自治区鱼类中的重金属含量。为了研究水产养殖鱼类中的重金属水平，并评估该地区人类食用鱼类的风险，我们在本研究中从拉萨市周围的渔业中采集了四种养殖鱼类（6 条大头鱼、5 条草鱼、5 条鲤鱼和 5 条罗非鱼）。采用电感耦合等离子体质谱仪测定了鱼类不同组织中的 9 种重金属（Cr、As、Cd、Pb、Cu、Ba、Co、Mn 和 V）。Cr、Ba、Co、Mn 和 V 容易在鳃中积累，Cu 则存在于所有鱼类的心脏中。在肝脏中，有毒金属（As、Cd 和 Pb）的含量高于其他组织，在所有组织中，重金属含量在肌肉中最低。在所有组织中，罗非鱼组织中的大多数重金属浓度高于其他鱼类组织，尤其是砷。罗非鱼样本中的砷含量比国家标准中污染物的最大限量（ML）高 2-4 倍，其他金属均低于 ML。将通过鱼类消费摄入的重金属的估计日摄入量与粮农组织建议的耐受日摄入量进行比较，从鱼类消费中摄入的 As、Cd 和 Pb 等金属对当地居民可能不会造成严重的健康风险。因此，有必要确定人类的剂量水平，这被认为是在没有不良影响的情况下每天摄入的剂量。
