Table 1.

Validity parameters in analytical determination of tetracycline residues in milk

Parameter	Oxytetracyclin	Tetracycline	Chlortetracycline	Doxycycline
LOD ng/ml	1.18	1.12	1.7	1
LOQ ng/ml	4	4	5	3
Regression coefficient	0.991	0.994	0.966	0.915
Retention Time (min)	4.56	5.01	7.90	11.78
Inter day precision N = 3 day	0.78	1.06	3.09	8.07
Entry day precision	0.59	1.33	3.19	6.13
Linearity equation	Y = 0.001376x	Y = 0.0157643x	Y = 0.0308564x	Y = 0.019085x