de Carvalho Gabriel Gustinelli Arantes, Degaspari Iracema Alves Manoel, Branco Vasco, Canário João, de Amorim Alberto Ferreira, Kennedy Valerie Helen, Ferreira José Roberto
Laboratório de Química Analítica, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Avenida Centenário, 303, 13416-000, Piracicaba, SP, Brazil.
Biol Trace Elem Res. 2014 Jun;159(1-3):128-34. doi: 10.1007/s12011-014-9995-6. Epub 2014 May 7.
Mercury occurrence was evaluated in samples of edible muscle tissue of 27 blue sharks (Prionace glauca) caught in the Atlantic Ocean, adjacent to the south and southeastern Brazilian coast, indicating a slight increase in comparison with previous data obtained for the same studied area and being higher than those fish caught at different sites of the Atlantic Ocean. Total Hg concentrations ranged from 0.46 to 2.40 mg kg(-1) with the organic Hg fraction ranging between 0.44 and 2.37 mg kg(-1). A negative correlation between total Hg concentration in muscle tissue and blue shark size was obtained, and 40% of samples analyzed had Hg concentrations higher than 1.0 mg kg(-1) Hg, the maximum concentration permitted in Brazilian predator fish. Data obtained showed that total Hg can be used as a reliable predictor of organic Hg in blue shark muscle because 95 to 98% of the total Hg measured was found to be organic mercury. The wide range of Hg concentrations obtained for our set of samples can be explained by the heterogeneity of sampled population and the large size of the studied area. Given the adverse toxicological effects of Hg on animals and humans, a regular monitoring program of Hg contamination in Brazilian marine ecosystem can be recommended.
对捕获于巴西南部和东南部沿海附近大西洋海域的27条大青鲨（Prionace glauca）可食用肌肉组织样本中的汞含量进行了评估，结果表明，与该研究区域之前获得的数据相比，汞含量略有增加，且高于在大西洋不同地点捕获的鱼类。总汞浓度范围为0.46至2.40毫克/千克，有机汞含量在0.44至2.37毫克/千克之间。肌肉组织中的总汞浓度与大青鲨的体型呈负相关，且40%的分析样本汞含量高于1.0毫克/千克汞，这是巴西掠食性鱼类允许的最大浓度。获得的数据表明，总汞可作为大青鲨肌肉中有机汞的可靠预测指标，因为所测总汞的95%至98%为有机汞。我们所采集样本的汞浓度范围较广，这可以通过采样群体的异质性和研究区域的广阔来解释。鉴于汞对动物和人类具有不利的毒理学影响，建议对巴西海洋生态系统中的汞污染进行定期监测。
