In this paper

we used corn starch as raw material

and tnen preparation the crosslinked starch

tne etherified starch

the amino starch and the DTC modified starch

then study the best preparation conditions of the four kinds of starch. The FTIR and SEM analysis were carried out on all of this samples. Analyze DTC modified starch by sulfur element analysis and conducted the chelating CuSO

4

solution experiments.The FTIR and SEM analysis showed that the starch was modified successfully

in neutral CuSO

4

solution

the chelating properties increased with the increase of the sulfur content of DTC modified starch

then compared chelating propertie in different CuSO4 of pH solution

when pH=11

sulfur content of 1.54% (WT) of the DTC modified starch dosage of 0.10g

the chelating properties reached the highest value of 500.9mg/g.