I used 664nm, 647 nm to measure the absorbance for chlorophylls. I used 10mg of fresh weight dissolved in 5ml of acetone. Could you please help me to find formulae for chlorophyll calculations.
There is a good paper: https://www.sciencedirect.com/science/article/abs/pii/0076687987480361
Coefficients and wave lengths vary depending on the solvent. However, I wouldn't be too worried if you control and treatment groups are processed analysed and calculated in the same way.