Description

Complete BOD Test Kit manufacturer and supplier. Dissolved oxygen. Biochemical oxygen demand Test kits for measuring Biological Oxygen Demand in water and wastewater for applications ranged 2 – 3000 mg/l O2.Application: Reagents: Manganous sulphate solution Alkali-iodine reagent  Starch indicator  0.00025 No Sodium thiosulphate solution  Dose: Note: Estimation of dissolved oxygen in water: Reagents: Manganous sulphate solution Alkali-iodine reagent Starch indicator 0.00025 No Sodium thiosulphate solution Procedure: . 20 mL of sample water was taken in a dry breakers. . Adding 3 drops of Manganous sulphate solution and 2 drops of alkali iodine solution to it. . Mix well and allow the precipitate to settle down. . Adding 2 drops of conc. H2 SO4 and mix well till the precipitate dissolves. .20 drops of the above solution was taken in a dry test tube. . Adding 1 drop of starch to the tube. A blue colour of the solution appears. . Adding Sodium thiosulphate solution drop wise with a calibrated pipette to the tube till the blue colour disappears. . Counting the number of drops of Sodium thiosulphate solution used. Calculation: Volume of water = No. of drops x Drop value of the pipette = p mL Volume of Na2 S2 O3 = No. of drops x Drop value of the pipette = q mL Dissolved oxygen (ppm) = 2 x q / p Result: The DO of the sample is ___________mg/L or ppm.