State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Int J Environ Res Public Health. 2020 Feb 10;17(3):1112. doi: 10.3390/ijerph17031112.
Traditional Pb isotopic identification only based on total Pb concentration and Pb isotopic ratios, resulted in difficulty for tracing Pb sources in the complex environmental medium, especially for sediment. Herein, a novel approach combining with regional geochemical baseline (RGB) and Pb isotopic ratios are used to directly trace anthropogenic Pb sources and calculate Pb source appointments in sediment. In this study, total Pb concentrations and isotopic ratios were analyzed for a 7-m long sediment core (92 sediment samples) collected from a reservoir. RGB of Pb was used to calculate anthropogenic Pb concentrations (R), their contributions (C) and screen the sediments influenced by anthropogenic activities. Among those sediments influenced by anthropogenic activities, a positive correlation was found between Pb/Pb ratios and R, indicating there were two anthropogenic Pb sources in sediment. Further source identification using Pb/Pb and Pb/Pb indicated that these two anthropogenic Pb sources originated from coal consumption and aerosol input. Finally, C and Pb isotopic ratios were used to calculate these two Pb source appointments (1.13% for coal consumption and 7.53% for aerosol input). This study demonstrated that source identification using RGB and Pb isotopes could be a novel attempt for identifying anthropogenic Pb sources in sediment.
传统的 Pb 同位素识别仅基于总 Pb 浓度和 Pb 同位素比值，这使得在复杂的环境介质中追踪 Pb 来源变得困难，特别是对于沉积物。在此，我们结合区域地球化学基线 (RGB) 和 Pb 同位素比值，提出了一种新的方法，用于直接追踪人为 Pb 源，并计算沉积物中 Pb 源的分配。在本研究中，对取自水库的 7 米长沉积物芯（92 个沉积物样品）进行了总 Pb 浓度和同位素比值分析。利用 Pb 的 RGB 计算人为 Pb 浓度 (R)、其贡献 (C)，并筛选受人为活动影响的沉积物。在受人为活动影响的沉积物中，发现 Pb/Pb 比值与 R 呈正相关，表明沉积物中有两种人为 Pb 源。进一步使用 Pb/Pb 和 Pb/Pb 进行源识别表明，这两种人为 Pb 源分别来自煤炭消耗和大气输入。最后，利用 C 和 Pb 同位素比值计算这两个 Pb 源的分配比例（煤炭消耗为 1.13%，大气输入为 7.53%）。本研究表明，利用 RGB 和 Pb 同位素进行源识别可能是识别沉积物中人为 Pb 源的一种新尝试。
