Environmental Engineering Reference
In-Depth Information
33. Explain in the BOD measurement why (a) diluted water, (b) bacterial seed, and (c) initial
oxygen saturation are all needed.
34. Explain the difference between direct iodometric titration and iodomeric back titration.
How is the color change different at the end point of titration?
35. A municipal wastewater sample contains 50 mg/L of ammonia (NH
3
), what is the
equivalent concentration of NH
3
-N (i.e., NH
3
as nitrogen) in mg/L?
36. The NPDES permit limit for PO
3
4
-P (i.e., PO
3
as phosphoras) is 1 mg/L, what is the
4
equivalent concentration for PO
3
4
in mg/L?
37. Describe the sample pre-treatment method for sulfide measurement using titration
procedure.
38. Explain the following: (a) why acid is added for oil and grease measurement? (b) why
cyanide is added for hardness measurement? (c) why zinc acetate is used for sulfide
measurement? and (d) why NaOH is used during the distillation of cyanide?
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