US 12,467,855 B2
Methods and apparatuses for spectrophotometric determination of contents and turbidity of a liquid sample
Eugene Gussakovsky, Winnipeg (CA)
Assigned to 6861025 Manitoba Ltd, Winnipeg (CA)
Filed by Eugene Gussakovsky, Winnipeg (CA); and 6861025 Manitoba Ltd., Winnipeg (CA)
Filed on Oct. 7, 2021, as Appl. No. 17/495,989.
Claims priority of provisional application 63/088,658, filed on Oct. 7, 2020.
Prior Publication US 2022/0107265 A1, Apr. 7, 2022
Int. Cl. G01N 21/31 (2006.01); G01N 21/25 (2006.01); G01N 21/3577 (2014.01)
CPC G01N 21/3103 (2013.01) [G01N 21/255 (2013.01); G01N 21/3577 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A testing method for determining contents of liquids, said method comprising:
(a) obtaining a subject liquid composed of multiple substances, at least one of which is a liquid component whose concentration is to be measured;
(b) using a testing apparatus comprising a light source for transmitting light through said subject liquid along a light path of known length (L) therethrough, a spectrometer operable to measure an intensity of the light after travel thereof through said subject liquid on said light path, and one or more computing devices connected to said spectrometer to receive light intensity measurements therefrom, performing the following steps:
(i) a liquid-absent measurement step comprising transmission of light along said light path in a state thereof absent of any liquid substance, and measurement by the spectrometer of the intensity of said light after travel of said light along said light path in said absence of any liquid substance, thereby obtaining an liquid-absent light intensity measurement (Ie) from the spectrometer;
(ii) a liquid-blank measurement step comprising transmission of light by said light source along said light path during occupancy of said light path by a pure unmixed volume of said liquid component, and measurement by the spectrometer of the intensity of said light after travel of said light along said light path and through said pure unmixed volume of said liquid component, thereby obtaining a liquid-blank light intensity measurement (Iw) from the spectrometer;
(iii) a subject liquid measurement step comprising transmission of light by said light source along said light path during occupancy of said light path by the subject liquid, and measurement by the spectrometer of the intensity of said light after travel along said light path and through said subject liquid, thereby obtaining a subject light intensity measurement (Is) from the spectrometer;
(c) using said liquid-absent light intensity measurement (Ie), said liquid-blank light intensity measurement (Iw), and said subject light intensity Is measurement, calculation by the one or more computing devices of both a volume concentration of the liquid component in said subject liquid, and a liquid-corrected light intensity (Iwc);
wherein, among said liquid substances of which the subject liquid is composed, said liquid component is water and the pure unmixed volume of the liquid component in the liquid-blank measurement step (b)(ii) is pure water, whereby the liquid-blank light intensity measurement (Iw) measured in the liquid-blank measurement step (b)(ii) is a water-blank light intensity measurement, the liquid-corrected light intensity (Iwc) calculated in step (c) is a water-corrected light intensity, and said volume concentration of the liquid component calculated in step (c) is a volume concentration of water.