title: Spectrophotometric determination of boron based on charge transfer reaction.
abstract: Boron determination by a charge transfer spectrophotometric method is described. Accompanied the reaction, a charge transfer complex can be formed by lysine with sodium 1, 2-naphthoquinone-4-sulfonate and boron in alkaline solution (pH 12.00). Subsequently, a new reaction mechanism has been proposed and discussed. The absorbance at the maximal absorption wavelength is 574 nm and boron concentration agrees well with Beer's law in a range of 2.16-43.24 μg mL(-1). The linear regression equation is A=-0.01867+0.01326C (μg mL(-1)), with a linearly correlation coefficient of 0.9935. The relative standard deviation (R.S.D.) of eleven parallel determinations is 2.1% with a detection limit (3σ/k) of 2.00 μg mL(-1). The recovery ranges from 96.4% to 104.5% with the satisfactory results. This method has been successfully applied to determine boron in pharmaceutical samples directly.
authors.affiliation: College of Chemistry and Environmental Science, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007, PR China.
authors.forename: Linjin
authors.initials: L
authors.lastname: Ma
authors.forename: Zhenxuan
authors.initials: Z
authors.lastname: Zhang
authors.forename: Quanmin
authors.initials: Q
authors.lastname: Li
mesh_terms: D001895:Boron / Q000032:analysis*; D002138:Calibration; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008239:Lysine / Q000737:chemistry; D009285:Naphthoquinones / Q000737:chemistry; D012996:Solutions; D013053:Spectrophotometry / Q000379:methods*; D013696:Temperature
chemical_list: D009285:Naphthoquinones; D012996:Solutions; C011942:1,2-naphthoquinone-4-sulfonate; D008239:Lysine; D001895:Boron