摘要
以PEG-400为相转移催化剂,采用一锅法合成了显色剂N-对氯苯甲酰基-N＇-（对苯磺酸钠）硫脲（CSBT）。经红外、紫外、核磁和元素分析等测试,确定了其组成和结构。研究了CSBT与Cu2＋发生显色反应的条件,结果发现,在p H4.0~6.0的HAc-Na Ac体系中,在表面活性剂十六烷基溴化铵（CTAB）存在下,Cu2＋和CSBT形成1∶3的黄绿色水溶性配合物,配合物最大吸收波长为370.0 nm,表观摩尔吸光系数为3.56×104L/（mol·cm）,Cu2＋在0~2.0μg·m L-1范围内遵从比尔定律。将此方法应用于茶叶中微量铜的测定,结果与原子吸收光谱法一致,相对标准偏差小于1.5%。
Using PEG-400 as the catalyst of phase transfe,A new reagent N-（ p-chlorbenzoyl）-N＇-（ sodium p-benzenesulfonate） thiourea（ CSBT） was synthesized by one-pot method and characterized by IR,UV spectra,1HNMR and elemental analysis. The color reaction condition of CSBT with Cu2 ＋was studied. The results showed that in the presence of CTAB CSBT could react with Cu2 ＋to form a stable yellow-green complex ratio of 1 ∶ 3 in Hac-Na Ac buffer solution（ p H4. 0-6. 0）. The maximum absorption peak of the complex was located at 370. 0 nm with apparent molar absorptivity of 3. 56 × 104 L /（ mol·cm）. Beer＇s law is obeyed in the range of0-2. 0 μg·m L- 1for Cu2 ＋. The proposed method has been applied to the determaination of Cu2 ＋in tea samples,and the results were consistent with those obtained by atomic absorption spectrometry with relative standard deviation（ RSD,n = 6） no more than 1. 5%.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2015年第4期530-532,共3页
Chemical Research and Application
基金
河南省教育厅自科基金项目(13B150171)资助
南阳师范学院专项基金项目(ZX2012011)资助
