摘要
本文研究了在非离子表面活性剂存在下结晶紫-硅钼杂多酸离于缔合物的分光光度性质,建立了灵敏度较高的水相测定痕量硅的分光光度法。硅量在0—3.0μg/25ml范围符合比耳定律,表观摩尔吸光系数为1.45×10^(5)。还讨论了离子缔合物的结构特点。测定实际样品的结果令人满意。
Ahighly sensitive spectrophotomctric method for determination of silicon,based on the ion-associate formed by molybdosilicatc(SiMo)with crystal violet(CV)in the presence of emulsifying agent OP,is described.The molar absorptivity of CV-SiMo was found to be 1.45×10^(5)dm^(3)·mol^(-1)·cm^(-1) at 555 nm.Beer's law was obeyed in 0-3.0μgSi/25ml.The proposed method has been applied to the determination of trace amount of silicon in water samples and alloys with Satisfactory results.The solubilization effect of the micelle of the nonionic surfactant on the ion-associate is further discussed.The spectrophotometric properties of the ion-associate was shown to depend mainly upon the properties of the basic dye cations.
作者
王镇棣
郑用熙
Wang Zhendi;Zheng Yongxi(Center of Chemical Analysis,Nanjing Institute of Forestry,Kanjing;Department of Chemistry and Chemical Engineering,Tsinghua University,Beijing)
出处
《高等学校化学学报》
SCIE
EI
CAS
1986年第9期775-779,共5页
Chemical Journal of Chinese Universities
