摘要
在pH值=4.0的条件下,Hg2+,I-与罗丹明6G(R6G)形成三元离子缔合物。由于HgI4(R6G)2分子间存在较强的分子间作用力和疏水作用力而生成[HgI4-(R6G)2]n纳米微粒。在320nm处产生一灵敏共振散射(即共振瑞利散射)光谱峰。Hg质量浓度在0.004～0.36mg·L-1范围内与共振散射光强度呈现出良好线性关系。实验结果表明,本法具有灵敏度较高、选择性较好等特点。用于水样中微量Hg的测定,效果良好。
Under the condition of pH = 4, Hg^2＋and I^- reacts with rhodamin 6G to form an tri-ion association complex and then a nanoparticle of [HgI4-（R6G）2 ]n is formed because of a strong intermolecular attraction force of HgI1（R6G）2. There is a sensitive resonance scattering peak （Rayleigh scattering） at 320 nm .When the concentration of Hg^2＋ is in the range of 0.004-0.36 mg· L^-1, there is a linear relation ship between the concentration of Hg^2＋ and the intensity of resonance scattering light. The method has the characteristic of high sensitivity and good selectivity. It has been applied to the sample of water and a good result is obtained.
