State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Environ Pollut. 2013 Oct;181:340-3. doi: 10.1016/j.envpol.2013.05.048. Epub 2013 Jul 1.
Tracing the sources of heavy metals in water environment is key important for our understanding of their pollution behavior. In this present study, Cd concentrations and Cd isotopic compositions in sediments were determined to effectively identify possible Cd sources. Results showed that elevated concentrations and high enrichment factor for Cd were found in all sediments, suggesting anthropogenic Cd origin. Cd isotopic compositions in sediments yielded relative variations ranged from -0.35‰ to 0.07‰ in term of δ(114/110)Cd (the mean: -0.08‰). Large fractionated Cd was found in sediments collected from a smelter and an E-waste town. Cd isotopic compositions and Cd concentrations measured in sediments allowed the identification of three main origins (dust from metal refining (δ(114/110)Cd < 0), slag of metal refining (δ(114/110)Cd > 0), and those δ(114/110)Cd = 0, such as background and mining activity). According to the actual precision obtained, Cd isotopes could be a potential tool for tracing metal pollution sources in water environment.
追踪水环境中重金属的来源对于我们了解其污染行为至关重要。在本研究中，通过测定沉积物中的 Cd 浓度和 Cd 同位素组成，有效地识别了可能的 Cd 来源。结果表明，所有沉积物中均发现 Cd 浓度升高且 Cd 富集因子高，表明人为 Cd 源。沉积物中 Cd 的同位素组成在 δ(114/110)Cd（平均值：-0.08‰）范围内变化范围为-0.35‰至 0.07‰。在冶炼厂和电子废物镇采集的沉积物中发现了大量的 Cd 分馏。沉积物中测量的 Cd 同位素组成和浓度可识别出三个主要来源（金属精炼粉尘（δ(114/110)Cd < 0）、金属精炼炉渣（δ(114/110)Cd > 0）和δ(114/110)Cd = 0，如背景和采矿活动）。根据实际获得的精度，Cd 同位素可能是追踪水环境中金属污染源的潜在工具。
