尼日利亚常见食用小龙虾中的重金属和多环芳烃及其健康风险影响

E. Nwaichi, B. G. Ibiama, J. Akaninwor
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摘要

重金属和多环芳烃是常见的环境污染物。它在水生环境中越来越多的存在引起了人们对其对水生生物的影响的严重关注,进而引起了对处于食物链顶端的人类的关注。本研究调查了尼日利亚常见的两种小龙虾中某些重金属(铅、镍、镉和铬)和多环芳烃的浓度及其对健康的风险影响。重金属测定采用湿消解法和原子吸收光谱法,多环芳烃分析采用美国环境保护署固体废物评价试验方法。结果表明,两种小龙虾的铅、镍、镉含量均在容许范围以上。竖尾对虾中镍的平均含量为3.0630.116mg/kg,花柱对虾中镍的平均含量为5.1571.676mg/kg。竖叶草中Cd的平均值为0.8330.070 mg/kg,花柱草中Cd的平均值为0.6000.025 mg/kg。铅的平均值分别为4.5500.656mg/kg和3.6430.486 mg/kg。铁蕨中铬的平均值为0.0870.082 mg/kg,花柱蕨中铬的平均值为0.000 mg/kg。石首草和柱头草中PAHs的平均浓度分别为0.0036±0.002 ppm和0.0083±0.004 ppm。健康风险评估显示,食用这两种小龙虾会增加健康风险。两种小龙虾的多环芳烃检测结果均符合规定限值。然而,它在鱼类食品中的存在表明了可能存在的健康问题,特别是关于它们的致癌倾向。由于涉及到食物链中的生物积累,应密切监测人为活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Heavy Metals and Polycyclic Aromatic Hydrocarbons in Commonly Consumed Crayfish in Nigeria and Health Risk Implications
Heavy metals and polycyclic aromatic hydrocarbons (PAHs) are common environmental pollutants. Its increased presence in the aquatic environment has raised serious concerns about its effect on aquatic life and by extension, a man who is at the apex of the food chain. This research investigated the concentrations of selected heavy metals (Lead, Nickel, Cadmium and Chromium) and PAHs in two species of commonly consumed crayfish in Nigeria and their health risk implications. Wet digestion procedure and atomic absorption spectrometry were used for heavy metal determination while the United States environmental protection agency (USEPA) test method for evaluation of solid waste was used for PAHs analysis. Results showed that Pb, Ni and Cd in both species of crayfish were above tolerable limits. The mean level for Ni in Litopenaeus setiferus was 3.0630.116mg/kg and 5.1571.676mg/kg in Litopenaeus stylirostris. The mean value for Cd in L. setiferus was 0.8330.070 mg/kg and 0.6000.025 mg/kg for L.stylirostris. The mean value for Pb in L. setiferus was 4.5500.656mg/kg and 3.6430.486 mg/kg in L. stylirostris. Mean values for Cr in L. setiferus was 0.0870.082 mg/kg and 0.000 mg/kg in L. stylirostris. Mean PAHs concentrations in L. setiferus and L. stylirostris were 0.0036±0.002 ppm and 0.0083±0.004 ppm respectively. Health risk assessment revealed an increasing health risk due to the consumption of both species of crayfish. Results for PAHs in both species of crayfish showed compliance with set limits. Its presence in fish food however suggests possible health concerns especially with regards to their carcinogenic tendencies. Anthropogenic activities should be closely monitored as bioaccumulation along the food chain is implicated.
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