ＴｒｉｔｏｎＸ１００对ＤＤＴＣ（二乙基二硫代氨基甲酸钠）与铜反应生成的络合物Ｃｕ（ＤＤＴＣ）２有增溶增敏作用，建立了低含量铜直接光度测定法。操作简便快速，选择性、精密度和回收率均较好，相对标准偏差为０８％～４３％，回收率为９６％～１０６％，摩尔吸光系数ε＝６４×１０３Ｌ／（ｍｏｌ·ｃｍ TritonX-100 pairs of DDTC (sodium diethyldithiocarbamate) and copper complex formed reaction Cu (DDTC) 2 solubilization sensitization effect, the establishment of a low content of copper direct spectrophotometry. The method has the advantages of simple and rapid operation, high selectivity, good precision and good recovery. The relative standard deviations are 08% ~ 43% and the recoveries are 96% ~ 106%. The molar absorptivity ε = 64 × 103L / (Mol · cm