中文摘要：

在pH5.0 NaAc-HAc缓冲溶液介质,活化剂邻菲啰啉（phen）、增敏剂十六烷基三甲基溴化铵（CTMAB）和氧化剂H_2O_2体系中,碳纳米微粒（CNPs）在423nm处产生较强的共振瑞利散射,显色剂茜素红（ARS）的吸收光谱与CNPs的共振瑞利散射光谱（RRS）重叠,二者产生等离子共振瑞利散射能量转移（SPRRS-ET）,导致散射光强度降低。Cr（Ⅵ）对H_2O_2具有催化氧化ARS作用,随着Cr（Ⅵ）浓度增加,ARS浓度降低,SPRRS-ET减弱,散射光增强,据此建立测定痕量Cr（Ⅵ）的共振光散射能量转移光谱分析法。Cr（Ⅵ）浓度在0.004-0.16 mg/L范围内与共振光散射增强ΔI呈良好的线性关系,回归方程ΔI423nm=49 442 C＋65.1,相关系数0.996 9,检出限8.0μg/L,回收率为96.82%-101.13%,用于环境水样Cr（Ⅵ）的测定,结果满意。

英文摘要：

In HAc-NaAc buffer solution containing phenanthroline（phen）as activator,cetyl trimethyl ammonium bromide（CTMAB）as a sensitizer and H_2O_2 as an oxidant,the carbon nanoparticles（CNPs）exhibited a strong SPR Rayleigh scattering peak at 423 nm.The receptor of ARS closed to the donor of CNPs with strong plasmon resonance（SPR）Rayleigh scattering（RS）,the SPRRS-energy transfer（SPRRS-ET）take place,that caused the peak at 423 nm decreased,owing to the overlapping of CNPs RRS and ARS absorption spectra.The Cr（Ⅵ）exhibited strong catalytic effect on the slow reaction of ARS-H_2O_2,when the concentration of Cr（Ⅵ）increased,the concentration of ARS decreased,and the amount of SPRRS-ET decreased,as a result,the RS intensity at 423 nm increased linearly.thus,the analytical method was established for determination of trace Cr（Ⅵ）.The increased intensity ΔI423nmwas linear to the Cr（Ⅵ）concentration in the range of 0.004-0.16 mg/L,with a regression equation ofΔI423nm= 49 442C＋65.1,and a detection limit of 8.0μg/L Cr（Ⅵ）.The SPRRS-ET assay was applied to the analysis of Cr（Ⅵ）in environmental water,with a satisfactory result.