Moslen M, Miebaka C A
Department of Applied and Environmental Biology, Rivers State University of Science and Technology, Port Harcourt, Nigeria.
Institute of Pollution Studies, Rivers State University of Science and Technology, Port Harcourt, Nigeria.
Bull Environ Contam Toxicol. 2017 Oct;99(4):506-510. doi: 10.1007/s00128-017-2169-4. Epub 2017 Sep 4.
Heavy metal bioconcentration in crabs from an estuarine creek in the Niger Delta was examined using atomic absorption spectrophotometry. Health risk via human exposure to metal toxicity was evaluated. Mean metal levels (µg/g) were Cr 2.32 ± 0.71, Ni 2.76 ± 0.48, Cu 12.94 ± 3.53, Pb 5.67 ± 1.03, Ag 1.83 ± 0.71 and Cd 0.73 ± 0.14 with significant difference (p < 0.001) between periods. Ni, Pb and Cd had values above FAO/WHO recommended limits. Estimated daily intake values were below the reference oral doses and the target hazard quotient was <1 for each metal examined while hazard index for all metals was also <1. The target carcinogenic risk value for Ni was 3.4 × 10. Based on the evaluations, the study concluded that consumers of crabs from the study area had minimal/moderate metal toxicity exposures of no significant health concern but recommended continuous monitoring to detect anomalies.
采用原子吸收分光光度法对尼日尔三角洲一条河口小溪中的螃蟹体内重金属生物富集情况进行了检测。评估了人类接触金属毒性所带来的健康风险。各金属元素的平均含量（微克/克）分别为：铬2.32±0.71、镍2.76±0.48、铜12.94±3.53、铅5.67±1.03、银1.83±0.71、镉0.73±0.14，不同时期之间存在显著差异（p<0.001）。镍、铅和镉的含量高于粮农组织/世界卫生组织推荐限值。估计每日摄入量低于参考口服剂量，所检测的每种金属的目标危害商均<1，所有金属的危害指数也<1。镍的目标致癌风险值为3.4×10。基于这些评估，该研究得出结论，来自研究区域的螃蟹消费者所接触的金属毒性最小/中等，对健康无重大影响，但建议持续监测以发现异常情况。
