If a pesticide released during a dawn (6 am) crop spraying event is present at 55 mg/L in a pond beside the farmer’s field, and the concentration is 41 mg/L at 11 am, 27.5 mg/L at 6 pm, midnight, 14 mg/L at 6 am the next day. What is the rate constant for the degradation of this pesticide? I already asked this question and someone answered it, but they did not show how they got the rate constant. Please show the math so I can understand the process.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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If a pesticide released during a dawn (6 am) crop spraying event is present at 55 mg/L in a pond beside the farmer’s field, and the concentration is 41 mg/L at 11 am, 27.5 mg/L at 6 pm, midnight, 14 mg/L at 6 am the next day. What is the rate constant for the degradation of this pesticide? I already asked this question and someone answered it, but they did not show how they got the rate constant. Please show the math so I can understand the process.
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