纳米金的制备及其检测水中重金属Cr³⁺的应用研究

Preparation of Nano Gold and Its Application in Detection of Heavy Metal Cr³⁺ in Water

摘要: 用偏钨酸铵修饰于纳米金颗粒(AuNPs)表面，并用少量的pH = 6.86的混合磷酸盐缓冲溶液调节pH值，使功能化纳米金溶液呈中性。当偏钨酸铵-AuNPs与Cr³⁺水溶液反应时，会产生颜色变化，可以用于比色分析。实验结果得到分光光度法的线性方程为y = 0.8901x − 0.2814，线性范围0.3~1 μg∙mL⁻¹，其检出限达0.14 μg∙mL⁻¹。因此，研究偏钨酸铵-AuNPs分光光度法可用于水中Cr³⁺的快速检测。

Abstract: The functionalized nanogold solution was neutralized by modifying the surface of the gold nano-particles (AuNPs) with ammonium metatungstate and adjusting the pH with a small amount of mixed phosphate buffer solution with pH = 6.86. When ammonium metatungstate-AuNPs are re-acted with an aqueous solution of Cr³⁺, a color change is produced which can be used for colorimetric analysis. The experimental results show that the linear equation of spectrophotometry is y = 0.8901x − 0.2814, the linear range is 0.3 - 1 μg∙mL⁻¹, and the detection limit is 0.14 μg∙mL⁻¹. Therefore, the study of ammonium metatungstate-AuNPs spectrophotometry can be used for the rapid detection of Cr³⁺ in water.