Determination of Tetracycline in Pharmaceutical Preparation by Molecular and Atomic Absorption Spectrophotometry and High Performance Liquid Chromatography via Complex Formation with Au(III) and Hg(II) Ions in Solutions

Table 6

Relative error percentage for determination of TC-Au complex by direct and standard addition FAAS method.

Method	State of drug	Stated concentration (mg per unit)	Found; (mg per unit)	Erel.%
Direct	Capsule	250	261.883	+4.753
Standard addition	Capsule	250	239.098	−4.361