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420 nm and change in solution pH was recorded. To determine the degree of dissociation, the sodium hexameta polyphosphate (SHMP)was dissolved in excess solution of 0.1MHCl and back titrated with alkali.µ«ÊÇÎҵĽá¹ûºÍÎÄÕ¸øµÄ²»Ò»Ñù¡£Ï£ÍûÄÄλ´óÏÀÖ¸µãһϣ¡
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