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US 5,667,754 AGranted
Device for chloride ion removal prior to chemical oxygen demand analysis
AssigneeHach Company
InventorsScott Vance Brayton, Donald Gene Miller
Life of this patent
Estimating the term…
Abstract
A method of pretreating aqueous chemical oxygen demand (COD) samples to remove the risk of potential chloride ion interference. The method comprises acidifying an aqueous COD test sample, and thereafter passing the acidified sample through a source of pentavalent bismuth (Bi.sup.5+) such as sodium bismuthate.
Claims6
A kit for conducting a chemical oxygen demand measurement of a test sample comprising:
- a cartridge unit for sample pre-treatment,
- a collection vessel having an opening with a rim, and
- a manganese III reagent for measuring the chemical oxygen demand of the sample,
- wherein the cartridge unit comprises:
- an inner and outer cartridge, said inner cartridge adapted to matingly fit within said outer cartridge to form the cartridge unit, each of said inner and outer cartridges having open upper ends and perforated lower ends,
- said outer cartridge containing in solid form a source of treatment reagent through which the test sample is to move,
- said inner cartridge containing a removable filter for collecting suspended particulates in the test sample for addition back to the test sample, said inner cartridge being inert to any chemical oxygen demand test reagent it may contact during use, and
- said outer cartridge being adapted to matingly fit within the rim of said collection vessel.
5 more elements
Dependencies are inferred from the claim text.