Spectrophotometric Determination of Boron with Chlorotetracycline

Department of Chemistry, S. V. University, Tirupati Manusript received 28 June 1976, accepted 10 November 1976 A spectrophotometric method for the determination of boron at trace levels is presented with chlorotetracycline as a new analytical reagent in concentrated sulphuric acid. The absorp­tion maxima of the reagent was a 410 nm and of the boron-chlorotetracycline complex was found to be at 570 nm. The coloured system conformed to Beer's law between 2.1 and 12.6 \(\mu\)g of boron. The spectrophotometric sensitivity of the method is 1.8 x 10-3 pg/cm' and the molar absorptivity is 5,800. The mole ratio of boron to chlorotetracycline in the coloured complex was found to be 1 : 1