Sequential analysis of hair mercury levels in relation to fish diet of an Amazonian population, Brazil
Sequential analysis of hair mercury levels in relation to fish diet of an Amazonian population, Brazil
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DOI：
10.1016/s0048-9697(00)00835-4
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发表时间：
2001-04-23
影响因子：
9.8
通讯作者：
Lucotte, M
中科院分区：
文献类型：
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作者：
Dolbec, J;Mergler, D;Lucotte, M
在亚马逊流域进行的几项研究表明，河流种群通过食用鱼类暴露于甲基汞。有人认为，通过序列分析观察到的头发汞的季节性变化可能与当地社区摄入的鱼类种类的变化有关。本研究的目的是调查吃鱼习惯与汞暴露的季节性变化之间的关系。来自位于亚马逊河主要支流塔帕霍斯河岸边的一个村庄的36名妇女组成了目前的研究人口。使用了一份面谈管理的调查表来收集关于社会人口特征、吃鱼习惯和其他有关资料的资料。这些妇女还提供了至少24厘米长的头发样本用于汞分析。用冷蒸汽原子吸收法测定了毛发总汞浓度和无机汞浓度。采用三角回归分析评价总汞含量的季节变化。无机汞的变化通过重复测量方差分析和对比变量分析的多项式变换来检验。结果显示，头发中的汞含量随季节而变化。在旱季对应的月份观测到较高的水平，在雨季观测到较低的水平。在旱季，47.2%的女性以草食性鱼类为主，但在雨季，这一比例上升至72.2%。与每周只吃几次鱼的人相比，每天吃鱼的人头发中的汞含量更高。通过每厘米头发中汞的含量进行回顾性汞分析，表明在研究前的2年中，人群的平均汞水平有所下降。头发中无机汞占总汞的百分比向发丝末端方向增加。食用更多鱼的那一组（按每日摄入量计算）体内无机汞的比例更高。这些结果支持了甲基汞暴露存在季节性变化的假设，以及食用的鱼类种类与由此产生的头发汞水平之间的关系。(C) 2001 Elsevier Science B.V.版权所有
Several studies in the Amazonian Basin have shown that riverine populations are exposed to methylmercury through fish consumption. It has been suggested that seasonal variations in hair mercury observed through sequential analyses may be related to the changes in fish species ingested by the local communities. The aim of the present study was to investigate the relationship between fish-eating practices and seasonal variation in mercury exposure. A group of 36 women from a village located on the banks of the Tapajos River, a major tributary of the Amazon, comprised the present study population. An interview-administered questionnaire was used to gather information on socio-demographic characteristics, fish-eating practices and other relevant information. The women also provided hair samples of at least 24 cm in length for mercury analysis. Hair total and inorganic mercury concentration was measured using a cold vapor atomic absorption analytical method. Trigonometric regression analysis was done to assess the seasonal variation of total mercury levels. Variations in inorganic mercury were examined by repeated measures analysis of variance, and analysis of contrast variable with a polynomial transformation. The results showed that hair mercury levels varied with the season. Higher levels were observed in months corresponding to the dry season, with lower levels in the rainy season. Herbivorous fish predominated the diet for 47.2% of the women during the dry season, but this rose to 72.2% during the rainy season. Those who reported eating fish daily had higher mercury levels in hair compared to those who only ate fish a few times per week. Retrospective mercury analyses, evaluated by the quantity of mercury present in each centimeter of hair, indicate that mean mercury level of the population decreased over the 2 years prior to the study. The percentage of inorganic mercury over the total mercuryin hair increased towards the extremities of the hair strand. Higher percentages of inorganic mercury were found for the group who ate more fish (on a daily consumption basis). These results support the assumption that there are seasonal variations in methylmercury exposure and also a relationship between type of fish species consumed and the resulting hair mercury levels. (C) 2001 Elsevier Science B.V. All rights reserved.