The effect of mass concentration of starch on accuracy of determining partially hydrolyzed polyacrylamide(HPAM) concentration by use of starch-cadmium iodide method was studied.

Conceal disturbing elements like iron, copper, lead with hydrogen fluoride amine-EDTA, add the potassium iodide to separate iodine, and take starch as indicator, titrate with sodium hyposulfite.