The herbicide, cotoran, was extracted from 100.00 ml of wastewater with chloroform. The extract was evaporated, transferred to a cuvette and titrated at 290 nm with an acetic acid solution of HClO4 T(HClO4/cotoran) = 0.0003000 g/ml. Calculate the concentration of mg/l cotoran in water based on the following results:
Option 2
Optical density of the solution after adding HClO4
0.0 ml 0.4 ml 0.8 1.2 1.6 2.0 2.4 2.8
0.345 0.290 0.240 0.190 0.140 0.095 0.070 0.050 0.040 0.030 0.020

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