Patent ID: 11971398
Assignee: ITA INTERNATIONAL, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. 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.