Table 1.

Calibration curves of cadmium(II) ions measured at various values of pH.

pH	Equation	R2	n	R.S.D	LOD	LOQ
pH 4	y = 34.478x − 11.073	0.994	5	4.6%	0.10 nM	0.40 nM
pH 5	y = 39.723x − 24.233	0.996	5	3.2%	0.01 nM	0.03 nM
pH 6	y = 32.108x + 17.833	0.998	5	5.1%	0.25 nM	1.00 nM