Method for continuous determination of volatile impurities in co

Chemistry: analytical and immunological testing – Optical result – Including gas absorption in liquid or solid

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436181, 436177, 422 8211, 359123, 359141, G01N 2100

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active

054609739

ABSTRACT:
A method of optically measuring volatile impurities in contaminated medium using a combination of a distillation process with head space analysis. The method uses a hydrophobic extracting membrane at the surface of an internal reflection element (an optical fiber or an attenuated total reflection crystal). The hydrophobic analytes are extracted into the extracting membrane, from the contaminated medium. By heating the contaminated medium to form a vapor and cooling the sensor element surrounded by the extracting membrane this invention significantly reduces the limit of detection by between two and three orders of magnitude from the prior art. The distillation aspect of the method also serves to protect the extracting membrane surrounding the sensor from damage by the mechanical impurities in the contaminated medium. A simultaneous continuous analysis of several impurities of the contaminated medium is possible by several optical fibers arranged in parallel on the same cooling device, each of which is designed for another contaminate by means of optical filters, wavelengths disperging elements (gratings or prisms) or wavelength selective IR sources or detectors.

REFERENCES:
patent: 5059396 (1991-10-01), Opitz et al.
H. Heinrich et al; Determination of Organic Compounds by IR/ATR Spectroscopy with Polymer Coated Internal Reflection Elements; Appl. Spec. 44 1641-46 (1990).

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