Abstract:Several kinds of Polyethylene glycol with different molecular weight (M=4000、6000、1000、20000) are used as the standard substances in the investigation their maximum absorption bands by ultraviolet spectrophotometry. The influences of some factors, including chromogenic reagent dosage, chromogenic reaction time and so on, are also investigated. The optimal amount of iodine, amount of BaCl2 and chromogenic reaction tim are 0.1 mL, 2.0 mL and 420~660 s, respectively. This method is simple, fast and has high accuracy. It is suitable for the determination of rejection rate and water flux of PSF/PAN blend ultrafiltration membrane.
