氯化钠-二乙基二硫代氨基甲酸钠-二苯胍体系分离铜（Ⅱ）

文章建立了一种利用二苯胍作共沉淀剂分离痕虽Cu（Ⅱ）的新方法。Cu（Ⅱ）与二乙基二硫代氨基甲酸钠（铜试剂，DDTC）形成不溶于水的棕黄色螯合物被吸附在二苯胍的表面，随二苯聪的抚淀而析出，从而使Cu（Ⅱ）得到富察。结果表明：控制pH=1．0，当周体NaCl用量为1．0g，0．0μmol／L钢试剂溶液用量为1．00mL，1．0×10^-3mol/L二苯弧乙醇溶液用量为0．20mL时，Cu^2＋与钢试剂形成棕黄色的螯合物沉淀，随二苯胍共沉淀析出，实现了Cu^2＋-Al^2＋、Cu^2＋-Zn^2＋,Cu^2＋-Mn^2＋间的液-固定量分离。与传统的有机溶剂萃取浮选分离及泡沫浮选分离栩比，该体系具有不使肘有毒害作用的有机溶剂，设备筒单，分离速度快等优点。

Separation of Copper(Ⅱ) by Sodium Chlorine-Sodium Diethyldithiocarbamate-Diphenyl Guanidine System

In the paper, a new method for the separation of trace Copper （ Ⅱ ） was established by using the diphenyl guanidine as the coprecipitation agent. Copper（Ⅱ） reacted with sodium diethyldithiocarbamate to form the insoluble brown yellow chelate complex,which was absorbed on the surface of diphenyl guanidine and was coprecipitated with diphenyl guanidine,so Copper （ Ⅱ） was enriched. The results showed that by controlling pH=1,0, in the presence of 1.0 g NaCI when the dosage of 0.01 mol·L^-1 sodium diethyldithiocarbamate solution was 1.00 mL and 0.001 mol ·L^-1 diphenyl guanidine ethanol solution was 0.20 mL, Cu^2＋ was reacted with sodium diethyldithiocarbamate to form the brown yellow chelate precipitate, which was coprecipitated with diphenyl guanidine. The quantifative separation of the Cu^2＋-Al^3＋, Cu^2＋-Zn^2＋, Cu^2＋-Mn^2＋ was achieved. Compared with the traditional organic solvent extraction and foam flotation separation, this system has many advantages such as non-use of poisoning effect organic solvents, simple equipment, faster separation.