Trace Level Determination of Polyether Ionophores in Feed

Table 3

The mean recoveries with the corresponding standard deviations of the polyether ionophores analysed at three spiking levels (𝑛=18).

	Spiking level (mg/kg)	Mean concentration (mg/kg)	Recovery %	Relative standard deviation (%)
Lasalocid	0.20	0.19	95	35
	0.40	0.45	112	5.0
	0.80	0.76	95	6.0
Monensin	0.025	0.019	75	13
	0.05	0.050	100	26
	0.10	0.10	100	9.2
Salinomycin	0.025	0.19	77	13
	0.05	0.054	108	12
	0.10	0.097	97	9.8
Narasin	0.025	0.020	81	112
	0.05	0.054	109	9.5
	0.10	0.096	96	5.9
Maduramicin	0.025	0.019	74	18
	0.05	0.055	109	9.5
	0.10	0.095	95	7.4
Semduramicin	0.20	0.15	77	20
	0.40	0.43	106	17
	0.80	0.74	92	16