Abstract：The PHA and HHA are synthesized and the metal-ligand stabilityconstants of PHA and HHA with copper（Ⅱ）, Zinc（Ⅱ） Nickel（Ⅱ） andmanganese（Ⅱ） are determined by PH titration technique. The resultsshow that with the same sort of hydroxamic acid, the
1988, Vol. 12 