Patent ID: 9366629
Filing Date: 2016-06-14
CPC Classification: B01F,B01L,G01N

Claim Text:
1. Process for metering lead Pb2+ in a sample of water containing lead Pb2+, said process comprising the following successive stages: providing the sample of water containing lead Pb2+; performing stage (A) of obtaining a lead-concentrated water sample with a lead concentration factor of at least 25, by concentrating the lead Pb2+ of said sample of water; and performing stage (B) with the following sequential steps: mixing water from the lead-concentrated water sample with a selective, lead-sensitive fluorescent probe with a known fluorescence intensity/lead metering function to produce a water/fluorescent probe mixture, exciting the thus-produced water/fluorescent probe mixture by light, and optically collecting a resulting fluorescence intensity of the thus-excited water/fluorescent probe mixture to determine a detected fluorescence intensity, and starting from the thus-detected fluorescence intensity, the lead metering of the sample to be metered is determined based on the fluorescence intensity/lead metering function, wherein stage (A) is performed as follows: a first sub-stage (A1) of passing said sample of water containing lead Pb2+ as received in the providing step, over a selective adsorbent that does not fix other parasitic ions to thereby adsorb the lead Pb2+ from said sample of water on the selective adsorbent, wherein said selective adsorbent is functionalized silica balls, and a second sub-stage (A2) of initiating a desorption of the lead Pb2+ with an eluent to thereby obtain the lead-concentrated water sample that is concentrated with the lead Pb2+ and that is substantially lacking in other parasitic ions.