Question
BOD values of four samples $A, B, C$ and $D$ of water are $60,80,100$ and $150 \mathrm{mg}$ /itre, respectively. Which is more polluted?(a) $\mathrm{A}$(b) B(c) $\mathrm{C}$(d) D
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Step 1: The BOD (Biochemical Oxygen Demand) value is a measure of the amount of oxygen that bacteria will consume while decomposing organic matter under aerobic conditions. Show more…
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Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled $A, B$ and $C$; but the laboratory attendant did not note which was which. The BOD values of the three samples $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ were recorded as $20 \mathrm{mg} / \mathrm{L}, 8 \mathrm{mg} / \mathrm{L}$ and $400 \mathrm{mg} / \mathrm{L}$, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?
Water samples with BOD values of $4 \mathrm{ppm}$ and $18 \mathrm{ppm}$, respectively, are : (a) Clean and Clean (b) Highly polluted and Clean (c) Clean and Highly polluted (d) Highly polluted and Highly polluted
Environmental Chemistry
Topic 2 : Water and Soil Pollution
Water is considered to be polluted if the dissolved oxygen (DO) content is less than ............. ppm. [E.A.M.C.E.T. 2003] (a) 5 (b) 10 (c) 15 (d) 100
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