Glass rod, pipette a number. Test process 1, the exact amount of measuring cylinder water 200ml in 15 200ml beaker. It will be numbered sequentially. 2, Pipette were removed 40 times diluted aluminum chloride solution 0,11 # .32ml, 0.48ml; L, 10 #, 1,200ml beakers, 5 #, 8 # .32ml, 0.40ml.16ml , 0.24ml, 0,0,120 mg / L), 15 # beaker (converted to the content of phosphorus stock solution dosage followed by 40 mg / L, 60 mg / L, 80 mg / L, 100 mg .2,120 mg / L), 0,0: Weigh 5g liquid phosphorus removal agent in 100ml volumetric flask .96ml sequentially added to the number 1 #, 13 # beaker (converted into the content of 10% polyaluminum solution Dosages were as follows: 40 mg / L, 60 mg / L, 80 mg / L, 100 mg # 47,4 #, 7 # , 14 # beaker (converted into the content of 10% polyaluminum solution dosage followed by 40 mg / L, 60 mg / L, 80 mg / L, 100 mg # 47,6 #, 9 #, 120 mg / L) , Shake .3, 40 times diluted aluminum chloride solution: Weigh 2.5g of liquid polyaluminum chloride solution (alumina content of 10%) in 100ml volumetric flask; After stirring 15S, allowed to stand 30min.4, Use a pipette to remove 20 times diluted solution of phosphorus 0.48ml were added to the order number 3 #. 20ml sequentially added to No. 2 #. 64ml, 0.80ml Dilute 20 times the solution of phosphorus; L; After stirring 15S, stand for 30min.3, pipette were removed 50 times diluted aluminum chloride solution 0,0, shake 4, diluted 50 times Polyaluminum chloride solution: Weigh 2.0g of liquid polyaluminum chloride solution (aluminum oxide content of 10%) in 100 ml volumetric flask, add water to the score, shake test preparation 1, oxidation ditch water samples: 5L. 40ml, 0.60ml;