铜与丙酮醛双(N,N′-二丁基)缩氨基硫脲显色反应的研究

Spectrophotometric Study on Cu(Ⅱ) with Pyruvaldehyde (N,N′ Dibutyl) Bis Thiosemicarbazone

在ｐ Ｈ＝ ５ ～１２ 的乙醇水溶液中， Ｃｕ２ ＋ 与丙酮醛双 Ｎ， Ｎ′缩氨基硫脲（ Ｐ Ｔ Ｓ Ｂ） 可形成１∶１型络合物，其λｍａｘ ＝ ４８８ｎ ｍ ，ε４８８ ＝ １ ．０９ ×１０４ Ｌ·ｍ ｏｌ－ １·ｃｍ － １ ， Ｃｕ２ ＋ 浓度在０ ～５ ．０ ｍｇ／ Ｌ内服从比耳定律；若用氯仿萃取后测定，其ε４８８ ＝ １ ．７７ ×１０５ Ｌ·ｍ ｏｌ－ １ｃｍ － １ ， Ｃｕ２ ＋ 浓度在０ ～０ ．５０ ｍｇ／ Ｌ 内服从比耳定律．大多数外来离子不干扰，用于环境水样中 Ｃｕ２ ＋ 的测定，结果令人满意．

Pyruvaldehyde (N,N′ dibutyl) bis thiosemicarbazone (PTSB) is employed as a sensitizing chromogenic agent in the spectrophotometric determination of Cu(Ⅱ). In the alcohol liquid of pH=5～12, the apparent molar absorptivity of Cu(Ⅱ) at 488nm is measured to be 1.09×10 4L·mol -1 ·cm -1 and the calibration curve is linear over the range 0～0.5mg/L. If using extraction determination, the apparent molar absorptivity will to be 1.17×10 5L·mol -1 ·cm -1 and the calibration curve is linear over the range 0～0.50mg/L. The molar ration of Cu(Ⅱ) to PTSB in the complex is examined to be 1∶1. The common ions do not interfere. The method has been applied to the determination of Cu(Ⅱ) in environmental water samples.