SOURCES AND MOBILITY OF LEAD AND CADMIUM IN SOIL, GROUNDWATER, AND VEGETATION

旨在 (1)识别源（地质、点源或区域源 污染）的土壤、植被和地下水中的金属 美国东北部使用： (a)Pb同位素 (b)Cd、Ni、Cr、As、Cu、Zn元素比例 (2)确定陆地生态系统中的金属流动率， 超过100年的大气沉积记录，并评估 金属向地表水、水生生态系统的潜在释放率 和地下水 (a)确定森林地表和其他土壤中储存的铅的冲刷时间 通过使用Pb同位素的生态系统分区 (b)测定铅、镉、铬、砷、镍、铜和锌的冲洗时间， 碳金属比和质量平衡 (3)评估地下水中Pb、Cd、Cr、As、Ni、Cu和Zn的浓度 和地表水，并确定目前人类接触的范围 对于单独的金属和金属的组合是可能的。 (4)联合收割机结合目标1、2和3的结果， 人类未来可能接触的个别金属和金属组合 在美国东北部。

Aims (1) Identify sources (geologic, point-source or regional-source pollution) of metals in soils, vegetation and groundwater of the Northeastern US using: (a) Pb isotopes (b) Elemental ratios of Cd, Ni, Cr, As, Cu and Zn (2) Establish metal mobility rates in terrestrial ecosystems utilizing greater than 100 years of atmospheric deposition records and evaluate potential release rates of metals into surface water, aquatic ecosystems and groundwater (a) Determine flushing times of Pb stored in the forest floor and other ecosystem compartments through the use of Pb isotopses (b) Determine flushing times of Pb, Cd, Cr, As, Ni, Cu and Zn using carbon-metal ratios and mass balance (3) Assess Pb, Cd, Cr, As, Ni, Cu and Zn concentrations in groundwater and surface water and identify the range of present human exposures possible for individual metals and for combinations of metals. (4) Combine the results of aims 1, 2 and 3 to develop scenarios for potential future human exposure to individual and combinations of metals in the Northeastern US.