Potentiometric flow injection determination of manganese(II) by using a hexacyanoferrate(III)-hexacyanoferrate(II) potential buffer |
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Authors: | Ohura Hiroki Ishibashi Yuko Imato Toshihiko Yamasaki Sumio |
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Institution: | a Department of Industrial Chemistry, Faculty of Engineering, Kyushu Sangyo University, Matsugadai, Higashi-ku, Fukuoka 813-8503, Japan b Fukuoka Institute of Health and Environmental Sciences, Mukaizano 39, Dazaifu, Fukuoka 818-0135, Japan c Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8501, Japan |
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Abstract: | A highly sensitive potentiometric flow injection analysis method for the determination of manganese(II), utilizing a redox reaction with hexacyanoferrate(III) in near neutral media containing ammonium citrate is described. The analytical method is based on the detection of the change in potential of a flow-through type redox electrode detector, resulting from the composition change of an Fe(CN)6]3−-Fe(CN)6]4− potential buffer solution. A linear relationship between the potential change (peak height) and the concentration of manganese(II) was found. Manganese(II) in a wide concentration range from 10−4 to 10−7 M could be determined by appropriately altering the concentration of the potential buffer from 10−3 to 10−5 M. The lower detection limit of manganese(II) was determined to be 1×10−7 M. The sampling rate and relative standard deviation were 20 h−1 and 1.9% (n=8) for 6×10−6 M manganese(II), respectively. The proposed method was successfully applied to the determination of manganese(II) in actual soil samples obtained from tea fields. Analytical results obtained by the proposed method were in good agreement with those obtained by an atomic absorption spectrophotometric method. |
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Keywords: | Potentiometric flow-injection method Manganese(II) [Fe(CN)6]3&minus -[Fe(CN)6]4&minus Potential buffer Soil sample |
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