通过薄膜技术的扩散梯度在地下水中选择性取样和现场检测 (III) 和 (V)
Huachao Che1, Chengyu Yang2, Yulun Nie2
1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, Hubei, China; Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China.
这项研究在薄膜 (DGT) 设备中开发了选择性扩散梯度,使用新型凝准确测量环境中的有毒物种 (As(III和As(V)). 新方法为环境监测提供了高选择性和灵敏度.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 不稳定元素物种构成生态风险,但难以提取和选择性检测.
- 的物种化对于了解其环境命运和毒性至关重要.
- 现有的物种化方法经常遭受矩阵干扰,缺乏选择性.
研究的目的:
- 开发用于薄膜 (DGT) 技术中的扩散梯度的高度选择性吸附矩阵.
- 为了能够在环境样本中选择性提取和现场检测 (III) 和 (V).
- 为了提高物种分析的准确性和灵敏性.
主要方法:
- 制造基改性聚烯胺凝 (MCM-41-SH-PAM) 的醇功能化和聚乙烯胺功能化聚烯胺凝 (PEI-PAM) 的.
- 将这些凝集成到用于选择性金属离子结合的DGT设备中.
- 使用特定的酸溶液吸附物种的溶解.
- 使用感应合血源质谱法 (ICP-MS) 检测化.
主要成果:
- MCM-41-SH-PAM显示了99.5%的As(III) 吸附与最小的As(V) 交叉吸附 (0.6%).
- PEI-PAM在1小时内显示了>99.0%的As(V) 吸附,在12小时后显示了低的As(III) 吸附 (3.8%).
- 实现了80%的稳定回收率As(III) 和94.5%的As(V),检测极低的检测极限 (0.04微克/L为As(III),0.02微克/L为As(V)).
结论:
- 开发的基于MCM-41-SH-PAM和PEI-PAM的DGT设备提供了高度选择性和敏感的酸 (III) 和酸 (V) 的提取.
- 这些新的DGT设备通过在复杂的环境矩阵中提供强大的性能和高精度来克服传统方法的局限性.
- 该方法可以准确地在现场监测物种化,这对于环境风险评估至关重要.
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