Accession Number : ADD016374

Title :   Method for Quantitative Calibration of in Situ Optical Chemical Measurements in Soils Using Soil Class and Characteristics.

Descriptive Note : Patent, Filed 21 Jan 93, patented 31 May 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Apitz, Sabine E ; Lieberman, Stephen H

Report Date : 31 May 1994

Pagination or Media Count : 8

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.

Descriptors :   *CHEMICALS, *SOILS, *PATENTS, *CALIBRATION, *OPTICS, *QUANTITATIVE ANALYSIS, *TEST METHODS, DETERMINATION, LABORATORIES, MOISTURE, MOISTURE CONTENT, PROBES, RESPONSE, SIGNALS, MEASUREMENT, DETECTION, STRAIN GAGES, CONTAMINATION, GROUND WATER

Subject Categories : Optics
      Soil Mechanics
      Geology, Geochemistry and Mineralogy
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE