the pyrophosphate complexes were even more sensitive to electrolyte concentration than was the triply negative reference ion : the calculated mean net charge in the mobile phase for the two principal tc-pyrophosphate species were -4.5 +/- 0.5 and -4.9 +/- 0.5 at ph 4.3 , and -11.2 +/- 1.3 and -10.1 +/- 1.0 at ph 7.0 .
C0013832
electrolyte
C0022023
ion