Detection of Chloroorganics by Lipid Coated Quartz Crystal Microbalance Sensor

Abstract

A sensitive chloroorganics sensor using lipid coated quartz crystal microbalance (QCM) was developed. The mass change caused by a selective adsorption of chloroorganics on the surface of thin lipid film was detected as a frequency change of the QCM. Among the several lipids tested, the DC-7-12 gave the highs sensitivity for Trichroloethylene (TCE). A QCM coated with 5000ng of DC-7-12 gave the frequency change of 53Hz per 1000ppm of TCE, the calibration curve was linear up to 1000ppm. The response time was less than 2min. The sensitivity gradually decreased but it still showed more than 90% sensitivity after a months. By increase the amount of the coated lipid and by increase the basic frequency of the QCM, the sensitivity was improved up to 179Hz per 1000ppm. A possibility of selective determination of three different chlorrorganies was also shown by using the thin QCM coated with different kind of lipids