differences between anion ( [ ( 32 ) p ] phosphate , [ ( 45 ) ca ] edta ( 2- ) , [ ( 115 ) cd ( m ) ] -edta ( 2- ) ) , and cation ( [ ( 45 ) ca ] ( 2+ ) , [ ( 115 ) cd ( m ) ] ( 2+ ) ) movement are explained in terms of transport with the transpiration flux or by exchange reactions .
C0003075
anion
C0031603
phosphate