Question

Using Interpolation methods derive a predictive equation for dissolved oxygen concentration for a chloride concentration of 10 g/L. Determine what the DO is at T= 8 C and 18 C. You must use a minimum of 4 data points.

Dissolved Oxygen (mg/L) for Temperature (C) and Concentration of Chloride (g/L)

T(C) Cl=0g/L Cl=10g/L Cl=20g/L

0 14.6 12.9 11.4
5 12.8 11.3 10.3
10 11.3 10.1   8.96

15 10.1   9.03 8.08

20 9.09 8.17 7.35

25 8.26 7.46 6.73

30 7.56 6.85 6.2

Answer 1

at T=5o C and Cl=10 g/lt , we have DO =11.3 mg/lt

at T=10o C and Cl=10 g/lt , we have DO =10.1 mg/lt

therefore by interpolation

at T=15o C and Cl=10 g/lt , we have DO =9.03 mg/lt

at T=20o C and Cl=10 g/lt , we have DO =8.17 mg/lt

therefore by interpolation

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