Luo Lan, Chen He, Zhang Lichun, Xu Kailai, Lv Yi
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road, Chengdu, Sichuan 610064, China.
Anal Chim Acta. 2009 Mar 9;635(2):183-7. doi: 10.1016/j.aca.2009.01.020. Epub 2009 Jan 18.
A novel and sensitive gas sensor was proposed for the determination of carbon tetrachloride based on its cataluminescence (CTL) by oxidation in the air on the surface of nanosized ZnS. The luminescence characteristics and the optimal conditions were investigated in detail. Under the optimized conditions, the linear range of the CTL intensity versus the concentration of carbon tetrachloride was 0.4-114microg mL(-1), with a correlation coefficient (R) of 0.9986 and a limit of detection (S/N=3) of 0.2microg mL(-1). The relative standard deviation (R.S.D.) for 5.9microg mL(-1) carbon tetrachloride was 2.9% (n=5). There was no or weak response to common foreign substances including methanol, ethanol, benzene, acetone, formaldehyde, acetaldehyde, dichloromethane, xylene, ammonia and trichloromethane. There was no significant change of the catalytic activity of the sensor for 40h over 4 days, with a R.S.D. of less than 5% by collecting the CTL intensity once an hour. The proposed method was simple and sensitive, with a potential of detecting carbon tetrachloride in environment and industry grounds. The possible mechanism was also discussed briefly.
提出了一种新型灵敏的气体传感器，用于基于纳米硫化锌表面空气中氧化产生的催化发光（CTL）来测定四氯化碳。详细研究了发光特性和最佳条件。在优化条件下，CTL强度与四氯化碳浓度的线性范围为0.4 - 114μg mL⁻¹，相关系数（R）为0.9986，检测限（S/N = 3）为0.2μg mL⁻¹。5.9μg mL⁻¹四氯化碳的相对标准偏差（R.S.D.）为2.9%（n = 5）。对甲醇、乙醇、苯、丙酮、甲醛、乙醛、二氯甲烷、二甲苯、氨和三氯甲烷等常见外来物质无响应或响应较弱。通过每小时收集一次CTL强度，该传感器的催化活性在4天内40小时无显著变化，R.S.D.小于5%。该方法简单灵敏，具有在环境和工业场地检测四氯化碳的潜力。还简要讨论了可能的机理。
