University:
Swansea University
Course:
PM134 | Microbiology
Academic year:

2023
Views:

400

Pages:

2
Author:

Sanjeev KG

DETERMINATION OF CHEMICAL OXYGEN DEMAND AIM To determine the chemical oxygen demand of seunge sample. PRINCIPLE COD is the quality of oxygen conkemed by oxidizarte wale mattees in em be organic of any matter defined procedure conditions These matus mirceal in water sicheermate in an matter as oxidized In defined conditions. by an excess of potassium aid medium in pecunce of silver sulphate and mecury sulfall ences is Closed the polasseum dichromate by shop af ammonia sulphate (Mosale) •Kange application 30mg. O₂/L LL 100mg O2/L MATERIALS REQUIRED water sample Potassium dichromate Edution (O-IN), sodium triarulphate (O-IN) -15.81g of sodium thiorulfate in 100L of distilled water. Malch edition (1%) 100ml conical pask. Potassium iodine solutios unte bath, Titration apparatul PROCEDURE The water sample is collected thorn the sewage. Povred labelled 10ml of wall sample in as Test I, Torta Test 3. 3 100mL wwnical lase Simultaneously Hask distilled unter labelled as Blank 1,2,3 is taken im 3 100ml conical Mded sml the sential f of potassen didermale solution in each g tap me Hacks in wake then at 100% dos the lowed the samples to cool for lemins ided aml of KJ in each paske. Mded Stealed 10ml of selphuric acid in each Hack thi ontents eniosulphate Until of each Hash with OIN sodivem tne klice tour disappear completely. OBSERVATION Titration was conducted until the blue lace sisappearبه د completely until wele The amount of sodium thionelphate for each dwelled 10 2mL 11.ImL and 10 ml af fod sermple ml af 9.4 ml The average valus was taken to be 10 7ml 49.6ml respectively Afue calculator se olderved to the 88 mg 16. coo wa RESULT 200 repills showed distilled water containing oxidising aynaic material equivalent to 88mg/L given sample is consumable d ed ppm