摘要
以乙二醛和邻氨基苯酚合成的乙二醛缩-双邻氨基苯酚(以下简称GBH)为中性载体,将其与碳粉混合,以液体石蜡为粘合剂,制备了新型的铬(Ⅲ)离子选择性电极。电极对Cr3+的能斯特响应浓度范围为4.00×10-6～1.00×10-2mol/L,斜率为19.70mV/dec(25℃),检测下限为1.26×10-6mol/L。电极的响应时间小于20s,pH使用范围广(3.20～5.60),稳定性好,使用寿命长。在选定的条件下,考察了10余种离子的干扰情况,结果显示,电极对Cr3+具有较好的选择性。利用该离子选择性电极对工业废水中的Cr3+进行测定,结果令人满意。
A sensitive film of carbon paste doped with glyoxal-bis-hydroxyanil as a carrier was prepared for construction of Cr（m）-selective electrode. The electrode exhibts Nemstian response to Cr（lll） over a range of 4.00 × 10^-6- 1.00 × 10^-2 mol/L, with a slope of 19.70 mV per decade and a detection limit of 1.26 × 10^-6 mol/L. The response time of the electrode is less than 20 s. The potential of this electrode is independent of pH in the range of 3.20-5.60. It also exhibits good selectivity for Cr （III） over a wide variety of metal ions. The electrode has been used to determine the chromium contents in the wastewater, and the result is excellent.
出处
《化学传感器》
CAS
2011年第4期57-60,共4页
Chemical Sensors
