罗丹明6G共振散射光谱法测定水中痕量六价铬  

Resonance scattering determination of trace Cr(Ⅵ)in water with Rhodaine 6G

作　　者：梁爱惠[1] 蒋治良[1] 黄思玉[1] 刘庆业[1] 

机构地区：[1]广西师范大学资源与环境学系,广西桂林541004

出　　处：《环境污染与防治》2004年第6期472-474,共3页Environmental Pollution & Control

基　　金：国家自然科学基金 ( 2 0 0 365 0 0 1;2 0 175 0 18);广西自然科学基金资助项目 ( No.0 14 40 3)

摘　　要：在 0 .0 4mol/L H2 SO4 和 8.0× 10 - 4mol/L KI介质中 ,罗丹明 6G ( Rh G)在 5 80 nm处有 1个同步荧光峰。当有 Cr( )存在时 ,Cr( )与过量的 I-反应生成 I- 3,I- 3与 Rh G形成缔合微粒 ,在 32 0、40 0、5 95 nm处产生 3个共振散射 ( RS)峰 ;而在 5 80nm处荧光峰猝灭。六价铬浓度在 1.0× 10 - 7～ 2 0× 10 - 7mol/L范围内与 40 0 nm波长处的共振散射光强度成线性关系。据此建立了测定水中六价铬的共振散射光谱分析法。光谱研究结果表明 ,( Rh G-I3) n缔合微粒和界面的形成是导致体系 RS增强的根本原因。Under the conditions of 0.04 mol/L H-2SO-4-8.0×10+{-4} mol/L KI, there is a synchronous fluorescence peak at 580 nm for Rhodaine 6G (RhG). When there is Cr(Ⅵ),it reacts with I+- to form I+--3. Further more, RhG and I+--3 combine an ion association particle. The particles exhibit three resonance scattering peaks at 320 nm, 400 nm and 595 nm. And there is fluorescence quenching at 580 nm. Cr(Ⅵ) concentration in the range of 1.0×10 -7 to 20×10+{-7} mol/L is proportional to the resonance scattering intensity at 400 nm. And a new resonance scattering spectral method has been described for the determination of Cr(Ⅵ) in water samples. The spectral results have been verified that the formation of (RhG-I-3)-n association particles and the interface is main factor that cause the fluorescence quenching and resonance scattering effects.

关 键 词：罗丹明6G 共振散射光谱 猝灭 荧光 光谱研究 痕量 缔合 六价铬 Cr(Ⅵ) 测定 

分 类 号：X832[环境科学与工程—环境工程] O657[理学—分析化学]