Table 2

pH	*D_m*	Rr	R	T
3	0.35	1.35	5.69	1.17
4	0.28	1.28	4.62	1.36
5	0.46	1.46	6.71	1.07
6	0.51	1.51	7.07	1.27

D_m is the mass distribution ratio [also known as the capacity factor (K`) or the retention factor (K)].
R_r is the relative retention times [also known as the unadjusted relative retention (r_G)].
R is the resolution.
T is the tailing factor [also known as the symmetry factor (A_s)].

Table 2: Effect of pH of phosphate buffer on the chromatographic performance of the HPLC method.