2.2 release sewage plant samples from 2.1. drying after the filter so that the solvent type raekraye first. Fill the solvent polarity is increased, the second type is the ethyl acetate volume 300 ml the same as article 2.1.
2.2 the residue dried plant specimens in 2.1 after filtering. The first solvent to evaporate before. Fill solvents with increasing polarity of the second volume of 300 ml of ethyl acetate likes to 2.1.
2.2 the residue from the 2.1 plant samples to make dry after filtering. For the first kind solvent evaporate away. Fill with increasing solvent polarity type II is ethyl acetate volume 300 ml, as Article 2.1 .