Dorea J G, Moreira M B, East G, Barbosa A C
Departamento de Química, Universidade de Brasilia, Brazil.
Biol Trace Elem Res. 1998 Dec;65(3):211-20. doi: 10.1007/BF02789097.
Samples of 7 species of piscivorous, omnivorous, and herbivorous fish caught at 12 different sites on the Madeira River, Amazon Basin, were analyzed for selenium and mercury. Selenium was determined by anodic stripping voltammetry and mercury by cold vapor atomic absorption spectrophotometry. The means for selenium concentrations ranged from 0.49 to 3.11 nmol/g and for mercury from 0.41 to 6.66 nmol/g depending on the fish species. The molar ratios of Hg:Se increased according to the fish trophic level. Piscivorous species had the highest mean ratio (4.0) and herbivorous species the lowest (0.9). There was a positive and statistically significant correlation between selenium and mercury concentrations for the herbivorous species (r = 0.716; p = 0.0088) not seen for omnivororus and piscivorous species (r = -0.2032; p = 0.3407). These findings are significant for the fish-eating population of the Madeira River because the ingestion of mercury would always be in excess of selenium.
对在亚马逊流域马德拉河12个不同地点捕获的7种食鱼性、杂食性和草食性鱼类样本进行了硒和汞含量分析。硒通过阳极溶出伏安法测定，汞通过冷蒸气原子吸收分光光度法测定。根据鱼类种类不同，硒浓度均值在0.49至3.11纳摩尔/克之间，汞浓度均值在0.41至6.66纳摩尔/克之间。汞与硒的摩尔比随鱼类营养级升高而增加。食鱼性鱼类的平均比值最高（4.0），草食性鱼类最低（0.9）。草食性鱼类的硒和汞浓度之间存在正相关且具有统计学意义（r = 0.716；p = 0.0088），而杂食性和食鱼性鱼类则未观察到这种相关性（r = -0.2032；p = 0.3407）。这些发现对马德拉河以鱼为食的人群具有重要意义，因为汞的摄入量总是会超过硒。
