Table 3

Method	LMT taken, µg mL^-1	Robustness	Ruggedness
		Parameter altered*	Inter-analysts, (%RSD) (n=4)	Inter-instruments, (%RSD) (n=4)
		H₂SO₄ concentration, (%RSD)	Inter-analysts, (%RSD) (n=4)	Inter-instruments, (%RSD) (n=4)
A	6.0	1.56	0.88	1.65
B	8.0	-	0.99	1.58

*In method A, concentration of H₂SO₄ were 0.08, 0.1 and 0.12 M

Table 3: Method robustness and ruggedness expressed as intermediate precision (% RSD).