초록

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

대표청구항 ▼

[ What is claimed is:] [1.] A test cartridge unit for use in measuring the chemical oxygen demand measurement of a treatment sample in conjunction with a sample collection vessel, comprising:an inner and an outer cartridge, said inner cartridge adapted to matingly fit within said outer cartridge to

[ What is claimed is:] [1.] A test cartridge unit for use in measuring the chemical oxygen demand measurement of a treatment sample in conjunction with a sample collection vessel, comprising:an inner and an outer cartridge, said inner cartridge adapted to matingly fit within said outer cartridge to form the cartridge unit;each of said inner and outer cartridge having open upper ends and perforated lower ends;said outer cartridge retaining in solid form a source of bismuthate mixed with an inert filter aid through which a test sample is to move;said inner cartridge containing a removable filter for collecting suspended particles in the test sample for addition back to the test sample;said inner and outer cartridge being comprised of polypropylene or polyethylene.