Spectrophotometric determination of boron based on charge transfer reaction

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• 作者：Linjin Ma^a ; Zhenxuan Zhang^a ; Quanmin Li ; ^a ; ^{mercury6068@hotmail.com"" rel=""nofollow}
• 关键词：Charge transfer ; Boron ; Lysine ; Sodium 1 ; 2-naphthoquinone-4-sulfonate ; Spectrophotometry
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：79
• 期：3
• 页码：599-602
• 全文大小：234 K

文摘

Boron determination by a charge transfer spectophotometric 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.