Table 2.

Analytical parameters for the initial rate method for determination of investigated cephalosporins with alkaline potassium permanganate.

Investigated cephalosporin	Linear range,	Least square equation		Correlation
	M × 10−5	log   V = log   K′ + n log   C		coefficient	LOD μg mL−1
	(μg mL−1)	Intercept (log  K′)	Slope (n)	(r)
Cefotaxime	1.04 to 3.14	1.918	1.007	0.9999	0.121
	(5–15)
Cephapirin	1.18 to 3.54	1.866	1.010	0.9999	0.117
	(5–15)
Cephradine	1.43 to 4.29	1.788	0.9942	0.9997	0.162
	(5–15)
Cephalexin	1.43 to 4.31	1.856	1.001	0.9996	0.19
	(5–15)
Ceftazidime	0.78 to 2.33	2.044	1.046	0.9995	0.233
	(5–15)
Cefazoline	1.1 to 3.3	1.832	0.9918	0.9992	0.28
	(5–15)
Ceftriaxone	0.9 to 2.7	1.884	1.009	0.9994	0.241
	(5–15)
Cefuroxime	1.17 to 3.53	1.985	1.045	0.9996	0.209
	(5–15)