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US 11,971,398 B2Granted
Methods for detection of lead in water
AssigneeITA International, LLC
InventorsWilliam Cary Hill, Matthew Scott Hull
Life of this patent
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Abstract
Methods, apparatuses, and kits for detection of substances in water by forming a complex with an indicator reagent and filtering the complex on a filter or membrane are described. The concentrated indicator on the filter, membrane or other capture device provides a colorimetric readout that can determine the amount of substance present in a water sample. A computer-implemented method for determining the concentration of substances in water based on color data from the colorimetric readout is also described.
Claims6
A method for detection of lead in water, comprising:
- i) obtaining a sample containing water to be tested;
- ii) adding a water-soluble reagent comprising rhodizonate to the sample, which reagent is capable of forming an initial colored precipitate with lead in the sample, if present;
- iii) passing the sample and the water-soluble reagent through a filter or a membrane, wherein the filter or the membrane is configured to retain the initial colored precipitate;
- iv) after passing the sample and the water-soluble reagent through the filter or the membrane, adding an acidic developer to the filter or the membrane, wherein when lead is retained on the filter or the membrane the developer is capable of inducing formation of a subsequent colored precipitate;
- v) observing color intensity of the subsequent colored precipitate, if any, on the filter or the membrane and determining a concentration of the lead in the sample by comparing the observed color intensity to a set of calibrated color standards.
2 more elements
Dependencies are inferred from the claim text.