Ben-Gurion University of the Negev Research and Development Authority

University and Community College System of Nevada

Ofer Dahan

Shlomi Arnon

Elad Yeshno

A method for real-time determining a concentration level of nitrate in a water sample collected from soil at a given site, the water sample contains an unknown composition and unknown concentration of DOC, the method includes: (A) during an offline stage: (a.1) obtaining a testing sample from the soil; (a.2) determining first and second wavelengths correlated, respectively, to concentration levels of the DOC and nitrate in the testing sample; (a.3) creating a calibration equation for this site; and, (B) during real-time: (b.1) separately impinging on a real-time water sample from the soil light in said two wavelengths; (b.2) determining respective absorbances by the real-time sample in said two wavelengths; and (c) substituting the respective absorbances in the calibration equation to obtain the nitrate concentration in the real-time sample.

System and method for determining aqueous nitrate concentration in solution containing dissolved organic carbon

A system for measuring with the aid of light absorption spectrometry the concentration of one or more analytes in porewater in soil, the system comprising: one or more monitoring unit(s), each monitoring unit comprising a porewater sampler (), an optical flow cell () with a tube connecting the liquid inlet port of said optical flow cell to said porewater sampler; and vacuum arrangement to enable extraction of porewater; at least one light source () for generating a light beam to be transmitted through said optical flow cell (); and at least one detector () for obtaining spectral information from the beam exiting said optical flow cell. A method of measurement is also provided.

In-situ measurement of nitrate in soil

The present application is directed to a method and apparatus for monitoring soil hydraulic properties, and for collecting soil pore-water samples, in relatively undisturbed soil conditions, by means of a vadose zone probe () adapted to be mounted on an inflatable sleeve () for installation in a borehole () formed in the vadose zone, said vadose zone probe comprises a fluid cell () having one or more conduits () connected thereto for externally accessing its interior, and a porous medium () installed in, or formed on, one of its walls for allowing passage of liquid between the interior of said fluid cell and the borehole soil, wherein said vadose zone probe is made from an elongated body having a front () and rear () sides, and wherein said rear side is substantially flat and said front side is made from a deformable and permeable material, or having a curvature corresponding to the curvature of said borehole.

Method and system for monitoring soil properties

The embodiments of the invention are directed to a new apparatus and method of measuring the water content using time domain reflectometry (TDR), or electrical conductivity in deep soil levels. to. The method uses flat, flexible, waveguides attached to a flexible sleeve filled with a filling material which press the flexible waveguides against an irregularly shaped interior borehole wall.

Flexible probe for measuring moisture content in soil

The embodiments of the invention are directed to a new apparatus and method of measuring the water content using time domain reflectometry (TDR), or electrical conductivity in deep soil levels to. The method uses flat, flexible, waveguides attached to a flexible sleeve filled with a filling material which press the flexible waveguides against an irregularly shaped interior borehole wall.

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Midreshet Ben Gurion, Israel

Ofer Dahan