title: Determination of boron as boric acid in eye lotions using a sequential injection system.
abstract: A simple and reliable sequential injection analysis (SIA) system is described for the determination of boron as boric acid in eye lotions. This method is based on the complexation reaction between d-sorbitol and boric acid followed by the acid-base reaction with methyl orange (MO). The colour change reaction is monitored at 520 nm. The system is able to monitor boron at a frequency of 30 samples per h with a relative standard deviation of less than 0.6%. The calibration graph is linear up to 12-mg l(-1). The system has a detection limit of 0.06-mg l(-1). No significant differences (at 95% probability level) were found between the proposed SIA method and the reference method.
authors.affiliation: Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.
authors.forename: J Koos F
authors.initials: JK
authors.lastname: van Staden
authors.forename: M Mutshutshu
authors.initials: MM
authors.lastname: Tsanwani