Ogawa S, Sugimoto I
NTT Lifestyle and Environmental Technology Laboratories, Atsugi-shi, Kanagawa, Japan.
Water Sci Technol. 2002;45(4-5):201-6.
Water drawn from rivers into purification plants must be checked for the presence of odorous materials because oil or organic-solvent contamination of the water may occur. If the detection of odorous materials in water is untimely or fails, the consequences can be serious. Therefore, the water must be checked continuously. We have developed a water-monitoring system that uses a highly sensitive electronic nose consisting of quartz crystal microbalance sensors to detect odorous materials in water. The nose is sensitive enough to detect petroleum hydrocarbons without water vapor at a low-ppb level. However, the nose is very sensitive to humidity and temperature. We have thus developed a method for accurately maintaining the humidity and temperature in the sensor cell. Experimental results show that the developed system can quickly detect contaminated water that was mixed with gasoline, kerosene, or benzene (concentration: several hundred ppb level), and we should be able to classify the pollutant by using pattern recognition of the dynamic sensor response.
从河流抽取到净化厂的水必须检测是否存在有气味的物质，因为水可能会受到油或有机溶剂的污染。如果对水中有气味物质的检测不及时或出现失误，后果可能会很严重。因此，必须对水进行持续检测。我们开发了一种水监测系统，该系统使用由石英晶体微天平传感器组成的高灵敏度电子鼻来检测水中的有气味物质。这种电子鼻灵敏度足够高，能够在低ppb水平下检测无水蒸气情况下的石油烃。然而，该电子鼻对湿度和温度非常敏感。因此，我们开发了一种在传感器单元中精确保持湿度和温度的方法。实验结果表明，所开发的系统能够快速检测出与汽油、煤油或苯混合的污水（浓度：几百ppb水平），并且我们应该能够通过对动态传感器响应进行模式识别来对污染物进行分类。
