Galvão R C F, Holanda I B B, De Carvalho D P, Almeida R, Souza C M M, Lacerda L D, Bastos W R
Instituto Federal de Educação Ciência e Tecnologia de Rondônia-IFRO, Rodovia BR-435 Km 63 Zona Rural, Caixa Postal 51, Colorado do Oeste, RO, 76993-000, Brazil.
Laboratório de Biogeoquímica Ambiental Wolfgang Christian Pfeiffer, Universidade Federal de Rondônia, Rodovia BR-364 Km 9.5, Porto Velho, RO, 76815-800, Brazil.
Environ Monit Assess. 2018 Jan 10;190(2):77. doi: 10.1007/s10661-018-6460-6.
Total mercury (THg) concentrations measured in two freshwater shrimp species (Macrobrachium depressimanum and Macrobrachium jelskii) showed a relationship with the location of artisanal and small-scale gold mining (ASGM) from the Madeira River Basin, Western Amazon. Between August 2009 and May 2010, 212 shrimp samples were collected in the confluence of the Madeira River with three of its tributaries (Western Amazon). THg concentration was quantified in the exoskeleton, hepatopancreas and muscle tissue of the shrimps by cold vapor atomic absorption spectrophotometry. There were no significant differences between the two shrimp species when samples came from the Madeira River, but Hg concentrations were significantly lower in a tributary outside the influence of the gold mining area. Average THg concentrations were higher in the hepatopancreas (up to 160.0 ng g) and lower in the exoskeleton and muscle tissue (10.0-35.0 ng g and < 0.9-42.0 ng g, respectively). Freshwater shrimps from the Madeira River respond to local environmental levels of Hg and can be considered as biomonitors for environmental Hg at this spatial scale. These organisms are important for moving Hg up food webs including those that harbor economic significant fish species and thus enhancing human exposure.
在两种淡水虾类（深水沼虾和耶氏沼虾）中测得的总汞（THg）浓度与来自亚马逊西部马德拉河流域的个体和小规模金矿开采（ASGM）地点存在关联。在2009年8月至2010年5月期间，在马德拉河与其三条支流（亚马逊西部）的交汇处采集了212份虾样本。通过冷蒸气原子吸收分光光度法对虾的外骨骼、肝胰腺和肌肉组织中的THg浓度进行了定量分析。当样本来自马德拉河时，两种虾类之间没有显著差异，但在金矿开采区影响范围之外的一条支流中，汞浓度显著较低。肝胰腺中的平均THg浓度较高（高达160.0纳克/克），而在外骨骼和肌肉组织中较低（分别为10.0 - 35.0纳克/克和<0.9 - 42.0纳克/克）。来自马德拉河的淡水虾对当地环境中的汞水平有反应，在这个空间尺度上可被视为环境汞的生物监测器。这些生物对于汞在包括那些栖息着具有经济重要性鱼类物种的食物网中的传递很重要，从而增加了人类接触汞的机会。
