How to calculate COD ?

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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How to calculate COD ? 

Table # 1. Data for standard curve
Standard COD solution
KHP
H,0
Absorbance
(mg/L)
ml
ml
At 600 nm
100
0.11
200
2
8.
0.13
300
0.17
500
0.33
600
4.
0.37
800
8.
2.
0.50
900
9.
1.
0.58
1000
10
0.
0.64
**Note Standard (400 mg/L) was removed from the data because it was an outlier.
Table 2. Data for Samples
Sample
Tube #
Sample dilution
Th OD mg/L
Absorbance at
COD
600 nm
(mg/L)
Whey
19
1:100
60,000
0.33
Skim Milk
21
1:100
90,000
0.52
Apple juice
2
1:100
110,000
0.69
Apple Juice
4
1:1000
110,000
0.06
Whey
1:100
60,000
0.36
Skim Milk
16
1:100
90,000
0.49
3.
5.
Transcribed Image Text:Table # 1. Data for standard curve Standard COD solution KHP H,0 Absorbance (mg/L) ml ml At 600 nm 100 0.11 200 2 8. 0.13 300 0.17 500 0.33 600 4. 0.37 800 8. 2. 0.50 900 9. 1. 0.58 1000 10 0. 0.64 **Note Standard (400 mg/L) was removed from the data because it was an outlier. Table 2. Data for Samples Sample Tube # Sample dilution Th OD mg/L Absorbance at COD 600 nm (mg/L) Whey 19 1:100 60,000 0.33 Skim Milk 21 1:100 90,000 0.52 Apple juice 2 1:100 110,000 0.69 Apple Juice 4 1:1000 110,000 0.06 Whey 1:100 60,000 0.36 Skim Milk 16 1:100 90,000 0.49 3. 5.
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