乙二胺磺甲基化产物络合性能的研究

Research on complexing performance of the product of ethylenediamine sulphomethylation

以乙二胺、甲醛、亚硫酸钠为原料合成了乙二胺四甲撑磺酸盐（EDTS）,考虑了介质酸度、缓冲溶液用量、显色剂用量、显色温度等影响因素,利用分光光度法确定了EDTS与Cu^2＋形成络合物的最佳显色条件：pH值为5.0～5.8的Hac-NaAc缓冲溶液1.50 mL与6.0 mLEDTS混合在80℃水浴加热15 min得到的显色效果较好.用摩尔比法准确测定出EDTS对Gu^2＋的络合配比为2：1,形成的络合物最大吸收波长在590 nm处.

Ethylenediamine–tetramethyl-sulfonate is synthesized from sodium sulfite, formaldehyde and ethylenediamine. The influences of medium acidity, the dose of buffer solution, the dose of developer and color development temperature on the color-development property of the product are studied, and the optimal color-development conditions in using EDTS and Cu 2+ forming complex are determined using spectrophotometry. It is shown that, the color development result of the complex is better when Hac-NaAc buffer solution of 1.50 mL and EDTS of 6.0 mL are mixed and are heated 15 min in the water bath of 80 ℃. The complexing ratio of EDTS to Cu 2+ is measured by mole ratio method and it is 2∶1. The maximum absorbing wave-length of the formed complex is at 590 nm.