rate constants were obtained at various concentrations for the phosphonates ethane-1-hydroxy-1,1-diphosphonate ( ehdp ) , nitrilotri ( methylenephosphonic acid ) ( ntmp ) , n , n , n ' , n'-ethylene-diaminetetra ( methylenephosphonic acid ) ( entnp ) , and n , n , n ' , n'-hexamethylenediaminetetra ( methylenephosphonic acid ( hmtmp ) , at ph 5.00 , 6.00 , and 7.00 .
C0012544
diphosphonate
C0086268
ehdp