US Geological Survey, Columbia Environmental Research Center, Columbia, MO 65201, USA.
Arch Environ Contam Toxicol. 2013 Aug;65(2):332-44. doi: 10.1007/s00244-013-9893-5. Epub 2013 Apr 19.
Chemical data from soil and weathered waste material samples collected from five uranium mines north of the Grand Canyon (three reclaimed, one mined but not reclaimed, and one never mined) were used in a screening-level risk analysis for the Arizona chisel-toothed kangaroo rat (Dipodomys microps leucotis); risks from radiation exposure were not evaluated. Dietary toxicity reference values were used to estimate soil-screening thresholds presenting risk to kangaroo rats. Sensitivity analyses indicated that body weight critically affected outcomes of exposed-dose calculations; juvenile kangaroo rats were more sensitive to the inorganic constituent toxicities than adult kangaroo rats. Species-specific soil-screening thresholds were derived for arsenic (137 mg/kg), cadmium (16 mg/kg), copper (1,461 mg/kg), lead (1,143 mg/kg), nickel (771 mg/kg), thallium (1.3 mg/kg), uranium (1,513 mg/kg), and zinc (731 mg/kg) using toxicity reference values that incorporate expected chronic field exposures. Inorganic contaminants in soils within and near the mine areas generally posed minimal risk to kangaroo rats. Most exceedances of soil thresholds were for arsenic and thallium and were associated with weathered mine wastes.
从大峡谷北部五座铀矿（三座已复垦，一座已开采但未复垦，一座从未开采）采集的土壤和风化废物样本中的化学数据，被用于亚利桑那州凿齿袋鼠（Dipodomys microps leucotis）的筛选水平风险分析；未评估辐射暴露的风险。膳食毒性参考值用于估计对袋鼠鼠构成风险的土壤筛选阈值。敏感性分析表明，体重对暴露剂量计算的结果有重大影响；幼年袋鼠鼠比成年袋鼠鼠对无机成分毒性更敏感。使用考虑到预期慢性野外暴露的毒性参考值，为砷（137mg/kg）、镉（16mg/kg）、铜（1461mg/kg）、铅（1143mg/kg）、镍（771mg/kg）、铊（1.3mg/kg）、铀（1513mg/kg）和锌（731mg/kg）分别推导出了特定物种的土壤筛选阈值。矿区内和附近土壤中的无机污染物一般对袋鼠鼠构成最小风险。大多数土壤阈值的超标都是砷和铊，与风化的矿山废物有关。
