Contamination of aquatic reservoirs with metal ions is a slow gradual process that is not easy to detect. Consequences of the metal ions, especially the ones with high atomic numbers (heavy metals) at high concentrations, are severe and irreversible in aquatic reservoirs. As such, early detection mechanisms, especially at trace concentration, are essential for mitigation measures. In this work, a new, robust, and effective tool for trace metal detection and monitoring in aqueous solutions has been developed. Tablets (1 mm thick and similar to medicinal tablets) were manufactured from a powder comprising stilbene intercalated into gallery spaces of lanthanide-containing layered double hydroxides. The tablets were placed in a water column having different concentrations of Pb²⁺ and Cu²⁺ ions, and the water was allowed to flow for 45 minutes at a flow rate of 100 ml/s. Thereafter, the tablets were dried and made to powder, and their phosphorescence was measured. The gradual stilbene phosphorescence turnoff in the tablets from various concentrations of metal ions was correlated with sorption amounts. The tablets were able to detect effectively metal ions (up to Pb²⁺ 1.0 mmol/L and Cu²⁺ 5.0 mmol/L) in the aqueous media. As such, the concentrations of Pb²⁺ and Cu²⁺ ions at trace levels were determined in the test solutions. This method provides a real-time metal ion analysis and does not involve sampling of water samples for analysis in the laboratory.

中文翻译：

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使用Stilbene插入层状稀土氢氧化物片剂对水库中的痕量金属进行检测。

金属离子对水库的污染是一个缓慢的渐进过程，不易发现。金属离子的后果，特别是在高浓度下具有高原子序数（重金属）的离子，在水生水库中是严重且不可逆的。因此，早期检测机制（尤其是痕量浓度的检测机制）对于缓解措施至关重要。在这项工作中，开发了一种新的，健壮且有效的工具，用于水溶液中的痕量金属检测和监测。片剂（1毫米厚，类似于药用片剂）是由含有二苯乙烯的粉末制成的，该二苯乙烯插入含镧系元素的层状双氢氧化物的通道空间中。将片剂置于具有不同浓度的Pb ²⁺和Cu ^2+的水柱中离子，使水以100 ml / s的流速流动45分钟。此后，将片剂干燥并制成粉末，并测量其磷光度。片剂中来自各种浓度金属离子的逐步二苯乙烯磷光熄灭与吸附量相关。该片剂能够有效检测水性介质中的金属离子（最高Pb ²⁺ 1.0 mmol / L和Cu ²⁺ 5.0 mmol / L）。这样，在测试溶液中测定了痕量水平的Pb ²⁺和Cu ²⁺离子的浓度。此方法提供了实时的金属离子分析，并且不涉及对水样本进行采样以在实验室中进行分析。