食物相无机砷在黄颡鱼肉中的积累转化与健康风险评估
2021-03-30骆文宝彭菁珒
骆文宝 彭菁珒



摘 要:为探究食物相无机砷(iAs)在黄颡鱼肉中的积累转化与暴露浓度的关系,将含砷饲料投喂给黄颡鱼后,用ICP-MS测定鱼肉中总砷的浓度,用HPLC-ICP-MS分析As(III)、As(V)、一甲基砷(MMA)、二甲基砷(DMA)和砷甜菜碱(AsB)的含量。结果表明:2种iAs试验组中,总砷浓度均随暴露浓度的升高而升高;DMA浓度远高于MMA,最大约为7倍;AsB是鱼肉中的主要砷形态;500μg/g的暴露浓度下,鱼肉中iAs的积累已经能够造成健康风险,需谨慎对待。
关键词:无机砷;黄颡鱼;食相暴露;砷形态;风险评估
中图分类号 R995;S941.91文献标识码 A文章编号 1007-7731(2021)05-0070-03
Abstract:To investigate the relationship between the exposure concentration and bioaccumulation, biotransformation of inorganic arsenic (iAs) in muscle of Pelteobagrus fulvidraco after dietborne, the concentration of total arsenic in muscle of the fish was determined by ICP-MS and the contents of As(III), As(V), monomethylarsenic (MMA), dimethylarsenic (DMA) and arsenicbetaine (AsB) were analyzed by HPLC-ICP-MS after feeding arsenic-containing diets to the fish The results revealed that total arsenic increased with increasing exposure concentrations in both iAs groups; the concentration of DMA was much higher than that with MMA, with a maximum of about 7-fold; AsB was the predominant arsenic form in muscle; and at an exposure concentration of 500μg/g, iAs accumulation levels in fish are already capable of posing a health risk and need to be treated with caution.
Key words:Inorganic arsenic; Pelteobagrus fulvidraco; Dietborne exposure; Arsenic species; Risk assessment
砷是自然界广泛分布的有毒类金属元素,砷污染物在环境中不断迁移,使得砷在水生环境中的含量不断增加。黄颡鱼生长周期短,分布广泛,营养药用价值高,是我国重要的淡水经济鱼。因其底栖且杂食偏肉食的生活习性,极易受到底泥中及悬浮颗粒物中砷的污染。有研究表明,底栖鱼类体内砷的浓度与沉积物中砷的浓度呈显著正相关,摄食是鱼体砷积累的主要途径[1]。关于砷代谢的研究大多数集中在海水鱼的水相砷暴露试验,而关于食物相砷在淡水鱼中积累转化的研究却很少。为此,本研究将含无机砷饲料暴露给黄颡鱼,探究鱼肉中砷的积累与转化情况,并进行健康风险评估,以期为砷的生态毒理学研究提供相关数据和理论依据。
1 材料与方法
1.1 试验材料
1.1.1 试剂 As(III)和As(V)标准溶液(O2SI,美国);HNO3(≥99.999%,上海阿拉丁生化科技股份有限公司);H2O2和NH3·H2O(GR,上海阿拉丁生化科技股份有限公司)。
1.1.2 鱼样及饲料……
