Cadmium ion (Cd²⁺) with trimesic acid forms water insoluble complex. When uranyl ion (UO₂²⁺) is present with Cd²⁺, the complex shows intense luminescence of UO₂²⁺ and it is used for the trace level determination of UO₂²⁺ ions. A linear response of luminescence intensity of UO₂²⁺ ions was obtained over a concentration range of 1–75 ng mL⁻¹. Analytical data showed that the detection limit of 0.2 ng mL⁻¹ (7.4 × 10⁻¹⁰ M) of UO₂²⁺ ion is achieved with a relative standard deviation (RSD) 8.5% (n = 5). The proposed method was successfully applied for quantification of UO₂²⁺ ions in natural water and waste water from nuclear fuel processing plant. Furthermore, the estimation of UO₂²⁺ ions in cadmium matrix also has been carried out. This study provides a very simple, promising and a novel alternative method for the detection of UO₂²⁺ ions in environment.

镉离子（Cd ²⁺）与均苯三酸形成水不溶性复合物。当铀酰离子（UO ₂ ²⁺）与Cd ²⁺一起存在时，该络合物显示出强烈的UO ₂ ²⁺发光特性，并用于UO ₂ ²⁺离子的痕量测定。在1–75 ng mL ^-1的浓度范围内，获得了UO ₂ ²⁺离子的发光强度的线性响应。分析数据表明，UO ₂ ²⁺离子的检出限为0.2 ng mL ^-1（7.4×10 ^-10 M），相对标准偏差（RSD）为8.5％（n = 5）。所提出的方法已成功地应用于天然水和核燃料加工厂废水中UO ₂ ²⁺离子的定量分析。此外，还进行了镉基质中UO ₂ ²⁺离子的估算。这项研究为检测环境中的UO ₂ ²⁺离子提供了一种非常简单，有前途和新颖的替代方法。