Analytical system and method for detecting volatile organic compounds in water
First Claim
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1. A system for detecting organic compounds in water including:
- a surface acoustic wave detector configured to detect a mass of organic compounds separated by a gas chromatograph column, the surface acoustic wave detector having a sensing surface with a coating;
a vacuum pump for lowering pressure at the coating of the surface acoustic wave detector; and
a controller configured to control operation of the vacuum pump to lower pressure at the coating of the surface acoustic wave detector to remove moisture from the coating.
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Abstract
An analytical system and method for detecting volatile organic chemicals in water including a coated SAW detector that provides for improved reduction of moisture at the coating of the SAW detector. A stabilized SAW sensitivity and long lasting calibration is achieved. The analytical system further includes an improved sample vessel and sparger that allow for easy grab sample analysis, while also providing efficient purging of the volatile organic compounds from the water sample. In addition, an improved preconcentrator provides a stabilized sorbent bed.
80 Citations
15 Claims
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1. A system for detecting organic compounds in water including:
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a surface acoustic wave detector configured to detect a mass of organic compounds separated by a gas chromatograph column, the surface acoustic wave detector having a sensing surface with a coating; a vacuum pump for lowering pressure at the coating of the surface acoustic wave detector; and a controller configured to control operation of the vacuum pump to lower pressure at the coating of the surface acoustic wave detector to remove moisture from the coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting organic compounds in water including:
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purging the organic compounds from a water sample contained in a sample vessel; collecting the organic compounds with a preconcentrator; desorbing the organic compounds from the preconcentrator; separating the organic compounds as desorbed from the preconcentrator with a gas chromatograph column; detecting the mass of organic compounds separated by a gas chromatograph column with the acoustic wave detector; and lowering pressure at a coating of the surface acoustic wave detector to remove moisture from the coating. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification