煤基甲醇溶液中微量铬的测定  

Determination of Trace Chromium in Coal-Based Methanol

作　　者：李吉辉 Li Jihui(Shenhua Yulin Energy Chemical Company Limited,Yulin,Shaanxi 719309,China)

机构地区：[1]神华榆林能源化工有限公司,陕西榆林719309

出　　处：《化学世界》2021年第3期171-175,共5页Chemical World

摘　　要：以糠醛和1,3-二胺基硫脲合成的糠醛缩-1,3-二氨基硫脲为中性载体,将其与碳粉混合,以液体石蜡为黏合剂,制备了新型的铬(Ⅲ)离子选择性电极。室温下,电极对Cr^(3+)的能斯特响应范围为4.00×10^(-7)~1.00×10^(-2) mol/L,斜率为-20.33 mV/dec,检出限为1.55×10^(-7)mol/L。电极响应时间<20 s,pH使用范围广(3.20~5.00),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,并利用该离子选择性电极对煤基甲醇中的Cr^(3+)进行了测定,取得了较好的检测结果。With furfural-1,3-diamino-2-thiourea synthesized by furfural and 1,3-diamino-2-thiourea as a neutral carrier followed by mixing with carbon powder, liquid paraffin as the adhesive, a new type of chromium(Ⅲ) ion selective electrode was produced. At room temperature, the response range of electrode to Cr3+ was 4.00×10^(-7)~1.00×10^(-2) mol/L, the slope was 20.33 mV/dec, and the detection limit was 1.55×10^(-7) mol/L. Electrode response time was less than 20 s, and the pH range was wide(3.20~5.00) with a good stability and a long service of life. The interference of more than 10 kinds of ions was investigated under the selected conditions, and Cr^(3+) in coal-based methanol was measured by using the ion selective electrode with good results.

关 键 词：煤基甲醇 铬(Ⅲ) 离子选择性电极 糠醛缩-1 3-二氨基硫脲 

分 类 号：O6[理学—化学]