钨酸钠-罗丹明B-P体系共振光散射法对甲拌磷残留的测定  

Study on Determination of Phorate Residue with Sodium Tungstate-Rhodamine B-P System by Resonance Light Scattering Technique

作　　者：张国胜[1] 董学芝[1] 王爱芳[1] 李畅[1] 王明瑞[1] 

机构地区：[1]河南大学化学化工学院污染控制研究所,河南开封475001

出　　处：《分析测试学报》2008年第10期1062-1066,共5页Journal of Instrumental Analysis

摘　　要：研究了共振散射技术测定甲拌磷残留的新方法。实验结果表明，酸性溶液中，甲拌磷和钨酸钠相互作用能够形成杂多酸，该杂多酸与碱性三苯甲烷染料罗丹明B（RhB）结合，形成了缔合物粒子，导致体系在λex/λem=606nm共振散射（RLS）强度急剧增强，并产生新的RLS光谱。在选定的实验条件下，甲拌磷浓度在0．43-200nmol／L范围内，与体系的RLS强度有良好的线性关系（r=0．9977），据此建立了共振散射法快速测定甲拌磷的新方法，该法检出限为0．057nmol／L，回收率为82％～99％，用于蔬菜样品中甲拌磷残留量的测定，与气相色谱法对照，结果满意。A novel method for determination of phorate residue was studied by resonance light scattering（RLS） technique, based on the formation of the association particles between rhodamine B and heteropoly acides produced by the reaction of phorate with sodium tungstate in acid medium. The experimenal results indicated that the great increase of RLS at λex/λem=606 nm was observed. A good linear relationship （ r = 0. 997 7） was exhibited for phorate concentration in the range of 0. 43 - 200 nmol/L with the detection limit of 0. 057 nmol/L. The recoveries were range of 82% - 99% . The method was applied to determine the concentration of phorate residue in vegetable. The obtained results using RLS method were well in agreement with those obtained by gas chromatography method.

关 键 词：缔合物粒子 共振散射 甲拌磷残留 钨酸钠 罗丹明B 

分 类 号：O657.2[理学—分析化学] S482.48[理学—化学]