Uptake Rate in aquatic organism

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ecotoxicology
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Uptake Rate in aquatic organism

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Can you help me with the calculation for the following time concentration values..

The uptake of a compound is measured as a function of time, and the following mean values are obtained-
 
Time (min)                                                C (mg/l) 
0                                                                                     7.2
5                                                                                     15.4
10                                                                                   20.3
25                                                                                   57.8
50                                                                                   114.7
 
From these values, how can we estimate initial uptake rate? If yes, why and what is it (in mgl-1h-

Thanks