论文部分内容阅读
利用间接光度法测定微量氰化物的工作曾有报导,我们也曾发表了Cu-CAS-CPC体系间接光度法测定微量氰化物的方法。本文根据在pH10时银(Ⅰ)与4-[(5-氯-2-吡啶)偶氮]-1,3-二氨基苯(5-Cl-PADAB)在有阴离子表面活性剂十二烷基硫酸钠(SDS)和非离子表面活性剂平平加(Peregal O)存在下,可形成水溶性的红色络合物的特性;又当氰离子存在时则与银离子生成稳定的、具有一定组成的银氰络离子,从而阻止了Ag(Ⅰ)-5-Cl-PADAB-SDS红色络合物的生成的原理,提出了间接光度法测定微量氰化物的新方法。其表现摩尔吸光系数为2.5×10~4(在72型分光光度计上测得),颜色可稳定6小时。用该法对电镀排放废水中微量氰离子进行了测定及标准加料回收实验,获得了良好的结果。一、试剂及仪器
The use of indirect spectrophotometric determination of trace cyanide has been reported, we have also published a Cu-CAS-CPC indirect spectrophotometric method for the determination of trace cyanide. In this paper, based on the results of silver (I) and 4 - [(5-chloro-2-pyridyl) azo] -1,3-diaminobenzene (5-Cl- PADAB) in the presence of anionic surfactant dodecyl In the presence of sodium sulfate (SDS) and the nonionic surfactant Peregal O, a water-soluble red complex is formed, and when the cyanide ion is present, it produces a stable, defined composition with silver ions Silver cyanide ion, thus preventing the formation of Ag (Ⅰ) -5-Cl-PADAB-SDS red complex. A new method for the determination of trace cyanide by indirect spectrophotometry was proposed. Its performance molar absorption coefficient of 2.5 × 10 ~ 4 (measured on a 72 spectrophotometer), the color can be stable for 6 hours. The method was applied to the determination of trace cyanide ions in electroplating discharge wastewater and the standard feed-back recovery experiment. Good results were obtained. First, reagents and equipment