在碱性溶液中甲醛能还原Ag~+得到黄色银纳米粒子,使体系的共振光散射(RLS)强度增强,从而建立起测量环境中痕量甲醛的RLS新方法. 结果表明,新建方法测定甲醛的浓度线性范围为1.0×10~(-6)～2.0×10~(-5) mol/L,检出限为1.0×10~(-7) mol/L,样品加标测定的回收率为96.26%～103.32%. 并且不同浓度的甲醛还原Ag~+得到黄色银纳米粒子的颜色明显不同,基于此建立了一种可视化半定量测定痕量甲醛的新方法,此方法简便快速、灵敏度高. 用于环境水样、室内空气中甲醛的测定,结果满意.
In an alkaline solution, Ag~+ can be reduced by formaldehyde to form silver nanoparticles, leading to the resonance light scattering( RLS) intensities of the system to be enhanced. Based on these phenomena, a new RLS method for trace formaldehyde determination in environment water samples was established. Under the optimized reaction conditions, the enhanced RLS intensities of the system has a good relationship with the concentration of formaldehyde in a range of 1. 0 × 10 ~(-6) ～2. 0 × 10 ~(-5) mol/L with the detection limit of 1. 0 × 10~(-7) mol/L. The standard addition recovery ratio is in a range of 96. 26% to 103. 32% for formaldehyde detection in environmental water samples and in the indoor air. According to the phenomenon that the resultant from the reaction of Ag~+ and formaldehyde has different colors in the presence of formaldehyde with different concentrations, a visual semi-quantificational method for detection of formaldehyde could be achieved.
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