Piezoelectric detectors for organophosphorus compounds and pesticides.
Anal Chem 1972 Sep; 44(11):1764-1768
A quartz piezoelectric crystal coated with a substrate has been used for the detection of small mass changes caused by the selective adsorption of organophosphorus compounds and pesticides. Incorporation of the crystal into a variable oscillator circuit and measurement of the change in frequency of the crystal due to the increase in mass allows a highly sensitive indication of the amount of organophosphorus compound present in the atmosphere down to the part per million level. Instrumentation is relatively inexpensive and can be easily used in the field. Analysis is nondestructive and requires very little time. AT cut quartz crystals with fundamental frequencies of 9.0 MHz were coated with various inorganic substrates and these were evaluated as to selectivity and sensitivity with respect to organophosphorus pollutants. Other parameters that affect the efficiency of the detector were also studied and evaluated. The detector has potential use as both an air pollution sensor and a specific gas chromatography detector.
Air-samples; Chemical-hypersensitivity; Chromatography; Exposure-assessment; Exposure-levels; Exposure-methods; Organo-phosphorus-compounds; Organo-phosphorus-pesticides; Pesticide-industry; Pesticide-residues; Pesticides-and-agricultural-chemicals; Pollutants; Pollution
Eugene P. Scheide, Chemistry Louisiana State University Chemistry Department New Orleans, LA 70122
Louisiana St Univ New Orleans, New Orleans, Louisiana