摘要
建立一种环境水样中总锰的共振光散射分析新方法。在pH=6．0的Tris-HCl缓冲溶液中，锰（Ⅶ）氧化二甲基亚砜（DMSO）成为二甲基砜（DMSO2），生成的Mn^2＋与DMSO2结合形成离子缔合物，使体系的共振光散射急聚增强。在优化的实验条件下，在6．3×10^-9～7．5×10^-5mol／L浓度范围内，体系的△I值与锰（Ⅶ）浓度之间具有良好的线性关系，线性回归方程为△RLS=-217．3＋114．7c（r=0．9991）；检出限为1．9×10^-9mol／L；样品加标回收率为102．3％～106．5％。该法简便，特异，灵敏度高。用于环境水样中总锰的测定，结果满意。
A novel resonance light scattering method was established for the determination of trace total manganese in environmental water. Mn （ Ⅶ ） oxidates dimethyl sulfoxide （DMSO） to dimethyl sulfone （DMSO2 ） at pH =6.0 of Tris-HCl buffer solution, Mn（ Ⅱ） could react with dimethyl sulfone to form an ion association complex, so that the system＇ s scattering intensity of RLS is enhanced. Under the optimal experimental conditions, compared to the system＇s scattering intensity, Mn（Ⅶ） concentration had a good linear relationship in the range of 6.3×10^-9～7.5×10^-5mol/L, the linear regression equation was △IRLS = - 217. 3 ＋ 114. 7c （r = 0. 999 1 ）. The detection limit for total manganese was 1.9 × 10^ -9mol/L and the sample recoveries were 102.3% - 106.5%. The method was simple, specific, sensitive, and the results of determination of total manganese for environmental water samples were satisfactory.
出处
《应用化工》
CAS
CSCD
2009年第12期1817-1819,1821,共4页
Applied Chemical Industry
