2-(2-喹啉偶氮)-4-甲基-1,3-苯二酚固相萃取光度法测定铜的研究  

STUDY ON THE SOLID-PHASE EXTRACTION-PHOTOMETRIC DETERMINATION OF COPPER WITH A NEW COLOR REAGENT-2-(2-QUINOLYLAZO)-4-METHYL-1, 3-RESORCIN (QAMR)

作　　者：高小茵[1] 黎永坤[2] 胡秋芬[1] 尹家元[2] 杨光宇[2] 

机构地区：[1]玉溪师范学院化学系,云南玉溪653100 [2]云南大学化学系

出　　处：《理化检验（化学分册）》2003年第10期576-578,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：合成了新试剂2-(2-喹啉偶氮)-4-甲基-1,3-苯二酚(QAMDHB),并研究了试剂与铜的显色反应,在pH2.2磷酸-磷酸二氢钾缓冲介质中,溴化十六烷基三甲基胺(CTMAB)存在下,QAMDHB与铜反应生成2:1稳定络合物,该络合物可被Waters Porapak^(?)Sep-Park-C_(18)固相萃取小柱萃取,用乙醇洗脱后用光度法测定,在乙醇相中λ_(max)=550nm,ε=3.92×10~4L·mol^(-1)·cm^(-1)。铜含量在0～1.0μg·ml^(-1)范围内符合比耳定律,方法用于环境水样中铜含量的测定,结果满意。Synthesis of the new color-reagent QAMR was described and its molecular structure was qualified by IR-spectrometry. It was found that in a phosphate buffer solution of pH 2.2, and in the presence of CTMAB, QAMR reacts with Cu^(2+) to form a stable red colored complex with its mole ratio of R:Cu= 2:1. The QAMR-Cu^(2+) complex was extracted by the waters porapak Sep. -Park-C_(18) small column and then eluted with ethyl alcohol, in which the absorption maxima was found at 550nm, and the molar absorptivity was (ε_(550)) 3.92×10~4L·mol^(-1)·cm^(-1). Beer's law was obeyed in the range of 0～1.0μg·ml^(-1) of Cu(Ⅱ). In the application of this method to the determination of copper in some water samples, RSD's found were less than 3.5% (n=5), and recoveries were in the range of 94%～106%.

关 键 词：2-(2-喹啉偶氮)-4-甲基-1 3-苯二酚 固相萃取 光度法 测定 铜 饮用水 

分 类 号：TU991.21[建筑科学—市政工程] O657.3[理学—分析化学]