| A Kinetic Spectrophotometric Method for the Determination of Iron （Ⅲ） in Water Samples |
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| 作者单位： | JI Hongwei（Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China） ;
XU Jian（Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China） ;
XIN Huizhen（Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China） ;
YANG Xiaoman（Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China） ; |
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| 摘 要： | A new kinetic spectrophotometric method has been developed for the determination of iron (Ⅲ). The method is based on the catalytic effect of iron (Ⅲ) on the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 in acid medium. The advantages of the proposed method are that it is sensitive, accurate, rapid, inexpensive, can be operated under room temperature and has a large determination concentration range compared to other techniques. The obtained optimum conditions are pH 3.15, RAWL (200 mgL-1) 5.00mL, Potassium periodate solution (0.01 molL-1) 0.30mL, phenanthroline (0.02molL-1) 1.00mL, reaction temperature 25℃ and reaction time 7 miu. With this method iron could quantitively be determined in the range 0.00-0.02 mgL-1, the detection limit being 4.10×10-10mL-1. The relative standard deviations (RSD) in five replicate determinations for 3 μgL-1 and 5μgL-1 iron (Ⅲ) are 3.1% and 1.9%, respectively. The method has been applied to the determination of iron (Ⅲ) in tap water samples and seawater samples (from the South China Sea), the recovery rates being 98.0% and 100.5%, respectively.
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| 关 键 词： | 催化作用 分光光谱测量 铁元素 资源开发 |
A kinetic spectrophotometric method for the determination of iron (III) in water samples |
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| Authors: | Hongwei Ji Jian Xu Huizhen Xin Xiaoman Yang |
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| Institution: | Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China |
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| Abstract: | A new kinetic spectrophotometric method has been developed for the determination of iron (III). The method is based on the
catalytic effect of iron (III) on the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 in acid medium. The advantages of the proposed method are that it is sensitive, accurate, rapid, inexpensive, can be operated
under room temperature and has a large determination concentration range compared to other techniques. The obtained optimum
conditions are: pH 3.15, RAWL (200 mgL−1) 5.00 mL, Potassium periodate solution (0.01 molL−1) 0.30 mL, phenanthroline (0.02 molL−1) 1.00 mL, reaction temperature 25°C and reaction time 7 min. With this method iron could quantitively be determined in the
range 0.00–0.02 mgL−1, the detection limit being 4.10 × 10−10 g mL−1. The relative standard deviations (RSD) in five replicate determinations for 3 μgL−1 and 5 μgL−1 iron (III) are 3.1% and 1.9%, respectively. The method has been applied to the determination of iron (III) in tap water samples
and seawater samples (from the South China Sea), the recovery rates being 98.0% and 100.5%, respectively. |
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| Keywords: | iron kinetic spectrophotometry catalytic effect weak acid brilliant blue dye (RAWL) |
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