Sa. Nabi et al., FIELD METHOD FOR THE MICRO-QUANTITATIVE DETERMINATION OF TETRACYCLINEIN HUMAN URINE, Fresenius' journal of analytical chemistry, 360(1), 1998, pp. 140-141
A simple, fast and sensitive titrimetric method has been developed for
the determination of tetracycline hydrochloride in human urine using
m-dinitrobenzene as color agent and Dowex 1 x 8 as detection medium.