Chemistry: analytical and immunological testing – Geochemical – geological – or geothermal exploration – In situ testing
Patent
1993-01-21
1994-05-31
Johnston, Jill A.
Chemistry: analytical and immunological testing
Geochemical, geological, or geothermal exploration
In situ testing
73 84, 422 8207, 422 8208, G01N 3324, G01N 2164
Patent
active
053169506
ABSTRACT:
A method assures the quantitative or semiquantitative assessment of analytes in soils by in situ optical methods. A determination is made of the optical chemical response factors for chemicals of interest which are added in known amounts to discrete soil matrices (types) and conditions (moisture content) under controlled laboratory conditions to provide predetermined reference signals. A combination probe is provided with an optical chemical sensing device that produces chemical concentration signals representative of the concentration of a chemical of interest in a soil sample and further is provided with a strain gauge sensing device that produces strain gauge signals representative of soil type and optionally, condition of the soil sample. The combination probe is inserted into the soil sample and the optical chemical sensing device produces the chemical concentration signals and the optical strain gauge sensing device, simultaneously and in parallel, produces the optical strain gauge signals. The optical chemical concentration signals and strain gauge signals are fed to a processor where they are compared to the predetermined reference signals to arrive at an in situ quantification of chemicals of interest in the soil sample.
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Apitz Sabine E.
Lieberman Stephen H.
Fendelman Harvey
Johnston Jill A.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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