Manganese detection
AssigneeHach Company
InventorAngella Nicholle Greenawalt
Life of this patent
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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.
Claims9
A method for measuring an amount of manganese in an aqueous sample, comprising:
- reducing, using a dechlorination reagent, wherein the dechlorination reagent comprises iron (II) and potassium iodide, wherein the aqueous sample further comprises an interferent selected from the group consisting of:
- free chlorine and a monochloramine species;
- 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) added to the aqueous sample with Mn(IV);
- and
- measuring, using the oxidized amount of 3,3′,5,5′-tetramethylbenzidine (TMB) as 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), wherein the wavelength is predetermined.
A method for measuring an amount of manganese in an aqueous sample, comprising:
- reducing, using a dechlorination reagent, wherein the dechlorination reagent comprises iron (II) and potassium iodide, wherein the aqueous sample further comprises an interferent selected from the group consisting of:
- free chlorine and a monochloramine species;
- introducing an amount of 3,3′,5,5′-tetramethylbenzidine (TMB) into the aqueous sample, wherein Mn(IV) oxidizes the amount of 3,3′,5,5′-tetramethylbenzidine (TMB);
- and
- measuring, using the oxidized amount of 3,3′,5,5′-tetramethylbenzidine (TMB) as 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), wherein the wavelength is predetermined.
Dependencies are inferred from the claim text.