Pyridine-2,4,6-tricarboxylic acid is proposed as a new and sensitive reagent for the determination of Fe(H). The tridentate ligand combines with iron(II) in the acidic media at the pH of 2.2 to readily form an intense coloured red-purple iron(II) complex with an absorbance maximum at 488 nm in the first order derivative spectrum. The complex is stable for 3-4 h with no increase in the absorbance value. Beer's law is obeyed for iron(II) concentrations from 3.0-425.0 mu g mL(-1). The molar absorptivity was found in the range of 0.186 x 10(3) L mol(-1) cm(-1). The method has been successfully applied for the determination of iron(II) in food samples as well as indirect quantification of tetracycline class of antibiotics. Use of derivative spectroscopy eliminates commonly encountered spectral interferences in this determination due to impurities, excepients and additives in food and pharmaceutical samples.
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Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Nankai Univ, Key Lab Adv Energy Mat Chem MOE, Tianjin 300071, Peoples R China
Xuchang Univ, Sch Chem & Chem Engn, Xuchang 461000, Henan, Peoples R ChinaNankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Wang Hongsheng
Zhao Xiaoqing
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Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Nankai Univ, Key Lab Adv Energy Mat Chem MOE, Tianjin 300071, Peoples R ChinaNankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Zhao Xiaoqing
Liu Mingli
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Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Nankai Univ, Key Lab Adv Energy Mat Chem MOE, Tianjin 300071, Peoples R ChinaNankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Liu Mingli
Shi Wei
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Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Nankai Univ, Key Lab Adv Energy Mat Chem MOE, Tianjin 300071, Peoples R ChinaNankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Shi Wei
Cheng Peng
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Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China
Nankai Univ, Key Lab Adv Energy Mat Chem MOE, Tianjin 300071, Peoples R ChinaNankai Univ, Dept Chem, Tianjin 300071, Peoples R China