离子缔合体系测定痕量硒(Ⅳ)的研究与应用  

Study on ion-association system of determination trace selenium(IV) and its analytical application

作　　者：董文丽[1] 李和平[1] 徐刚[2] 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆科技学院化学与生物工程学院,重庆400050

出　　处：《食品与机械》2006年第4期81-83,共3页Food and Machinery

摘　　要：在吐温-60存在下，研究了硒（Ⅳ）与硫氰酸钾和乙基罗丹明B形成的三元离子缔合物的吸收光谱特性，最大吸收峰为605nm，表观摩尔吸光系数ε605=1．50×10^6L／mol·cm，硒（Ⅳ）浓度在0．0-2．0μg／25mL范围内符合比耳定律。用巯基棉富集分离干扰离子，测定了水样和食品中痕量硒，结果满意。In this paper,an absorption spectrum character of ternary ion - association complex of trace selenium （Ⅳ） was studied. It is based on the fact that selenium（Ⅳ） forms ternary complex with thiocyanate （SCN-） and ethyl rhodamine B （ERB） in the presence of Tween-60. The maximum absorption peak is 605nm and its apparent molar absorptivity is 1.5 × 10^6 L/mol · cm. The linear range is 0 - 2.0 μg/25 mL for selenium （Ⅳ）. After interfeing ions of samples are eliminated by thiohydroxy cotton of enrichment and separation, this method was applied to the determination of trace selenium（Ⅳ） in water and food samples with satisfactory resuha.

关 键 词：离子缔合物 分光光度法 痕量 硒 

分 类 号：TS207.3[轻工技术与工程—食品科学] X832[轻工技术与工程—食品科学与工程]