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

IPC: G01N31/22 ,  A01N37/16 ,  A01N59/00 ,  C02F1/72

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

IPC: G01N31/22 ,  G01N33/18 ,  G01N21/78

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.

公开(公告)号：US10203316B2

公开(公告)日：2019-02-12

申请号：US15223781

申请日：2016-07-29

Applicant: Hach Company

Inventor： Darren Kent MacFarland ,  Brendan Easley Young

IPC: G01N31/22 ,  G01N33/18 ,  G01N21/78 ,  B01J31/24 ,  C07C323/66 ,  C07D311/82 ,  B01J31/18 ,  B01J31/28 ,  B01J31/30

Abstract: A method of measuring nitrate concentration in an aqueous sample include mixing the aqueous sample with a water-soluble thioether compound including a chromophore group in the presence of a water soluble catalyst; measuring a color change, and correlating the color change to nitrate concentration.