【摘要】 以邻香草醛和硫代氨基脲合成的席夫碱邻香草醛缩硫代氨基脲(BH)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27.82 mV/dec(25℃),检出限为1.20×10-6mol/L。电极的响应时间小于30 s,pH使用范围广(3.2~5.8)。在选定的条件下,考察了10余种离子的干扰情况,并利用该离子选择性电极对工业废水中的Cr3+进行了测定。更多还原

【Abstract】 A sensitive film of carbon paste doped with 2-hydroxy-3-methoxy-benzaldehyhydrazine-carbothioamide as a carrier was prepared for construction of a Cr(Ⅲ)-selective electrode.The electrode exhibits Nernstian response to Cr(Ⅲ) over a range of 4.00×10-6～1.00×10-2 mol/L,with a slope of 27.82 mV per decade and a detection limit of 1.26×10-6 mol/L.The response time of the electrode is less than 30 s,and it could be used for 2 weeks successfully.The potential of this electrode is independent of pH in the range of 3.2～5.8.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 results are excellent.更多还原