甲基钙黄绿素与二氯化双(甲氧羰乙基)锡的显色反应及其应用

Color Reaction of Methyl Calcein with Bis(methoxycarbonylethly)tin Dichloride and Its Application

在pH10.5的NH3 NH4Cl缓冲溶液中,有溴化十六烷基三甲基铵(CTMAB)和Tri tonX 100存在下,二氯化双(甲氧羰乙基)锡与甲基钙黄绿素形成1∶2的有色络合物。络合物的最大吸收波长为500mm,表观摩尔吸光系数为1.90×104L·mol-1·cm-1,Sn浓度在0～2.5mg/L范围内符合比耳定律。方法用于PVC中间产品中R2SnCl4的测定,结果满意,相对标准偏差和回收率分别在0.61%～1.58%和97.2%～100.1%之间。

In pH 10.5 NH_(3)-NH_4Cl buffer solution and in the presence of cetyltrimethylammonium bromide and Triton X-100, bis(methoxy carbonylethyl)tin dichloride (simplified as R_(2)SnCl_(2)) reacts with methyl calcein to form a 1∶2 colored complex. The maximum absorption of complex is at 500 nm and the apparent molar absorptivity of the complex is 1.90×10^(4) L·mol^(-1)·cm^(-1). Beer’s law is oheyed in the range of 0～2.5 mg/L for Sn in R_(2)SnCl_(2).The proposed method has been applied to the determination of R_(2)SnCl_(2 )in polyviny1 chloride intermediate with satisfactory results. The relative standard deviations and recoveries are in the range of 0.61%～1.58% and 97.2%～100.1%, respectively.