| 电子鼻预处理装置的开发及适用性研究 |
| 摘要点击 1615 全文点击 965 投稿时间：2011-09-07 修订日期：2011-12-12 |
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| 中文关键词 电子鼻 土壤污染 土壤修复 挥发性氯代烃 湿度 |
| 英文关键词 electronic nose soil remediation soil ventilation volatile chlorinated hydrocarbons humidity |
| 作者 | 单位 | E-mail | | 卜凡阳 | 浙江清华长三角研究院生态环境研究所,浙江省水质科学与技术重点实验室, 嘉兴 314006
上海师范大学生命与环境科学学院,上海 200234 | | | 文晓刚 | 嘉兴学院机电学院, 嘉兴 314000 | wenxg.thzj@gmail.com | | 万梅 | 浙江清华长三角研究院生态环境研究所,浙江省水质科学与技术重点实验室, 嘉兴 314006 | | | 刘锐 | 浙江清华长三角研究院生态环境研究所,浙江省水质科学与技术重点实验室, 嘉兴 314006 | | | 陈吕军 | 浙江清华长三角研究院生态环境研究所,浙江省水质科学与技术重点实验室, 嘉兴 314006
清华大学环境学院,北京 100084 | | | 张永明 | 上海师范大学生命与环境科学学院,上海 200234 | |
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| 中文摘要 |
| 针对气敏传感器的信号响应受气体湿度影响较大的问题,开发了一套用于快速检测和实时监测土壤中挥发性氯代烃污染的电子鼻的预处理装置.优选了干燥剂的材质,评价了最适干燥剂的除湿性能和对氯代烃化合物的吸附情况; 把预处理装置与电子鼻联用,通过与气相色谱(GC)检测结果的比较,评价了其用于土壤通风净化过程监测的适用情况.结果表明:1以无水氯化钙和卤代烃分离管搭配组合的干燥装置效果最佳,湿度去除率达99%以上,电子鼻各传感器的基线值与对照组接近; 2上述干燥剂连续通入湿度为75%的空气,90 min内湿度几乎可完全去除,120 min内湿度去除率保持在95%以上,对传感器的基线影响较小.3预处理装置未造成检测气体的吸附损耗,通入干燥预处理装置前后的挥发性氯代烃气体浓度差异只有3%~5%; 4在土壤通风脱附过程的检测中,通气湿度98%以上的情况下,预处理装置在120 min内对湿度去除率达99%以上; 电子鼻与GC对四氯乙烯污染物的检测结果线性拟合判定系数R2＞0.99(n=18),表明配以干燥预处理装置的电子鼻能够较好地适用于土壤修复过程监测. |
| 英文摘要 |
| A pretreament device was implemented for removing the interference of humidity on the baseline signal response of sensors in an electronic nose, which was used for rapid detection and real-time monitoring of volatile chlorinated hydrocarbons (VCHs) pollution in soil. The desiccant material was optimized, and the humidity removal performance and adsorpiton of VCHs was studied. The pretreatment device was evaluated by both the electronic nose and gas chromatography (GC) for its applicability in monitoring the PCE concentration in the desorption gas during the soil ventilation process. The following results were obtained: 1 A desiccant tube with anhydrous calcium chloride followed by a halogenated hydrocarbon separation tube was the best device, with a humidity removal rate of over 99%, and the baseline values of each sensor in the electronic nose were close to that of the control. 2 The desiccant device described above could continuously remove almost all the humidity from air with 75% humidity within 90 min, and the humidity removal rate remained above 95% within 120 min, while little interference was observed on the baseline of each sensor. 3 Little adsorption was observed by the pretreatment device, the relative error being only 3%-5% between the concentration of VCHs before and after the filtration by the pretreatment device. 4When applied for monitoring the remediation progress in a soil ventilation process, 99% of humidity was removed within 120 min from air with humidity of over 98%, and the data determined with the electronic nose and GC fitted each other very well, with R2＞0.99. From the above, the pretreatment device connected with the electronic nose was considered to be applicable for monitoring the soil remediation process. |
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