-
公开(公告)号：US11567052B2
公开(公告)日：2023-01-31
申请号：US16667714
申请日：2019-10-29
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring nitrate in an aqueous sample, including: introducing an aqueous sample containing an amount of nitrate to a cation exchange resin; flowing the aqueous sample over copper metal; adding a reducing reagent to the aqueous sample; adding a colorimetric indicator to the aqueous sample; and measuring the amount of nitrate in the aqueous sample by measuring a change in intensity of the absorbance. Other aspects are described and claimed.
-
公开(公告)号：US11333645B2
公开(公告)日：2022-05-17
申请号：US16387191
申请日：2019-04-17
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
IPC: G01N31/22
Abstract: An embodiment provides A method for measuring fluoride concentration in an aqueous solution, including: preparing a metal-ligand complex, wherein the metal-ligand complex comprises chromeazurol S and aluminum; placing the metal-ligand complex in a sample containing fluoride, wherein the placing generates a color change by releasing the chromeazurol S from the metal-ligand complex; and measuring, using colorimetric techniques, a concentration of fluoride within the sample, wherein the measuring comprises measuring an absorbance wavelength of a colorimetric ligand. Other embodiments are described and claimed.
-
公开(公告)号：US20210123898A1
公开(公告)日：2021-04-29
申请号：US16667714
申请日：2019-10-29
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring nitrate in an aqueous sample, including: introducing an aqueous sample containing an amount of nitrate to a cation exchange resin; flowing the aqueous sample over copper metal; adding a reducing reagent to the aqueous sample; adding a colorimetric indicator to the aqueous sample; and measuring the amount of nitrate in the aqueous sample by measuring a change in intensity of the absorbance. Other aspects are described and claimed.
-
公开(公告)号：US20200333304A1
公开(公告)日：2020-10-22
申请号：US16387191
申请日：2019-04-17
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
IPC: G01N31/22
Abstract: An embodiment provides A method for measuring fluoride concentration in an aqueous solution, including: preparing a metal-ligand complex, wherein the metal-ligand complex comprises chromeazurol S and aluminum; placing the metal-ligand complex in a sample containing fluoride, wherein the placing generates a color change by releasing the chromeazurol S from the metal-ligand complex; and measuring, using colorimetric techniques, a concentration of fluoride within the sample, wherein the measuring comprises measuring an absorbance wavelength of a colorimetric ligand. Other embodiments are described and claimed.
-
公开(公告)号：US20200264145A1
公开(公告)日：2020-08-20
申请号：US16277397
申请日：2019-02-15
Applicant: Hach Company
Inventor： Melanie Ann Roth , Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring aluminum concentration in an aqueous sample, including: preparing a chromeazurol S indicator solution; placing the chromeazurol S indicator solution in a sample containing aluminum, wherein the placing causes the chromeazurol S to chelate aluminum within the sample creating a colored complex; and measuring, using colorimetric techniques, a concentration of aluminum within the sample, wherein the measuring comprises measuring an absorbance at a wavelength for the colored complex. Other embodiments are described and claimed.
-
Patent Agency Ranking
公开(公告)号：US11953480B2
公开(公告)日：2024-04-09
申请号：US17058610
申请日：2019-06-27
Applicant: HACH COMPANY
Inventor： Angella Nicholle Greenawalt , Darren Kent MacFarland
CPC classification number: G01N31/226 , A01N37/16 , A01N59/00 , C02F1/722 , G01N21/63 , C02F2303/04
Abstract: An embodiment provides a method for measuring peracetic acid concentration in an aqueous solution, including: combining, in a reactive solution, 4-(methylthio)aniline and at least one reactive species to produce a chromophore, wherein the at least one reactive species comprises a chromotropic acid disodium salt; placing the chromophore in an aqueous solution, wherein the aqueous solution comprises peracetic acid, wherein peracetic acid within the aqueous solution reacts with the chromophore; and measuring a concentration of peracetic acid within the aqueous solution, wherein the measuring comprises quantifying a colorimetric change of the aqueous solution caused by the peracetic acid reacting with the chromophore. Other embodiments are described and claimed.
-
公开(公告)号：US20230067125A1
公开(公告)日：2023-03-02
申请号：US17826858
申请日：2022-05-27
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
Abstract: An embodiment a method for measuring an amount of manganese in an aqueous sample, including: reducing, using a dechlorination reagent, wherein the dechlorination reagent comprises iron(II) and potassium iodide; oxidizing, under an alkaline condition using sodium hydroxide, Mn(II) to Mn(IV) in the aqueous sample, and chelating, using etidronic acid (HEDP), Fe(II) and Fe(III) in the aqueous sample, oxidizing an amount of 3,3′,5,5′-tetramethylbenzidine (TMB) with Mn(IV); and measuring, using a colorimetric indicator, the amount of manganese within the aqueous sample, by measuring an absorbance intensity at a wavelength of the oxidized amount of 3,3′,5,5′-tetramethylbenzidine (TMB). Other aspects are described and claimed.
-
公开(公告)号：US20220082493A1
公开(公告)日：2022-03-17
申请号：US17020154
申请日：2020-09-14
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt , Brendan Easley Young , Melanie Ann Roth
Abstract: An embodiment provides a method for measuring zinc and copper in an aqueous sample, including: reducing an aqueous sample containing an amount of zinc and an amount of copper with a reducing agent; buffering the reduced aqueous sample; chelating the amount of copper in the buffered aqueous sample with a copper(I) chelating agent; measuring the amount of copper in the aqueous sample by measuring a first change in intensity of the absorbance of the copper chelated aqueous sample; chelating the amount of zinc in the buffered aqueous sample with a zinc(II) chelating agent; and measuring the amount of zinc in the aqueous sample by measuring a second change in intensity of the absorbance of the zinc chelated aqueous sample. Other aspects are described and claimed.
-
公开(公告)号：US20210208119A1
公开(公告)日：2021-07-08
申请号：US17058610
申请日：2019-06-27
Applicant: HACH COMPANY
Inventor： Angella Nicholle Greenawalt , Darren Kent MacFarland
Abstract: An embodiment provides a method for measuring peracetic acid concentration in an aqueous solution, including: combining, in a reactive solution, 4-(methylthio)aniline and at least one reactive species to produce a chromophore, wherein the at least one reactive species comprises a chromotropic acid disodium salt; placing the chromophore in an aqueous solution, wherein the aqueous solution comprises peracetic acid, wherein peracetic acid within the aqueous solution reacts with the chromophore; and measuring a concentration of peracetic acid within the aqueous solution, wherein the measuring comprises quantifying a colorimetric change of the aqueous solution caused by the peracetic acid reacting with the chromophore. Other embodiments are described and claimed.
-
公开(公告)号：US10794882B2
公开(公告)日：2020-10-06
申请号：US15951927
申请日：2018-04-12
Applicant: Hach Company
Inventor： Darren Kent MacFarland , Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring fluoride concentration in an aqueous solution, including: preparing a polyethylene glycol (PEG) monomethyl ether to produce an ester; reacting the ester in the presence of ammoniated tetrahydrofuran to produce an amino polyethylene glycol; placing, in a solution comprising a benzaldehyde species with a phenol functional group and a carboxylic acid functional group, a 2,3,3-trimethylindolenine derivative to produce a hemicyanine with a phenol functional group and a carboxylic acid functional group; combining, in a polar aprotic solvent, the hemicyanine with the phenol functional group and carboxylic acid functional group with a 1,1-carbonyldiimidazole (CDI) and adding the amino-PEG to produce a hemicyanine-PEG; and creating a fluoride sensitive hemicyanine species by reacting the hemicyanine-PEG that contains a phenol functional group with a SiR3 species. Other embodiments are described and claimed.
-
-
-
-
-
-
-
-
-
Search Results
20
records
(took 0.015 seconds)
