Determination of Fe(II) and Fe(III) in fiber brucite by phenanthroline spectrophotometry under anaerobic condition
HAN Lin-bao1, DAI Qun-wei*1,2, DANG Zheng1, ZHAO Yu-lian1, HUANG Yun-bi1, DONG Fa-qin1,2
1. School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010,China;
2. Key Laboratory of Solid Waste Treatment and the Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China
Fe(II) and Fe(III) coexists in fiber brucite, which has important significance to the study of brucite. During the determination of iron content with various valence states, Fe(II) is easily oxidized to Fe(III) in air, leading to the poor accuracy. Aiming at this problem, the anaerobic incubator was employed for the treatment of fibrous brucite under anaerobic conditions. Fe(III) was firstly reduced to Fe(II) using hydroxylamine hydrochloride, and total Fe in fiber brucite was then determined based on the coloring reaction between phenanthroline and Fe(II). Meanwhile, the content of Fe(II) in solution without addition of hydroxylamine hydrochloride was also determined by phenanthroline spectrophotometry. The difference between total Fe and Fe(II) was the content of Fe(III). Thus the accurate determination of Fe(II) and Fe(III) in fiber brucite by phenanthroline spectrophotometry was realized. It was found that Beer′s law was obeyed for absorbance and mass concentration of Fe(II) in range of 0.02-5.0mg/L under the following experimental conditions: the wavelength was 510nm, the pH of coloring system was 2-5, and the coloring time was 10min. The correlation coefficient of calibration curve was 0.9999. Two fibrous brucite samples were determined according to the experimental method, and the standard deviations (RSD, n=6) of total Fe, Fe(II) and Fe(III) were all less than 1%. The content of total Fe was also determined by inductively coupled plasma atomic emission spectrometry (ICP-AES), and the found results were consistent with those obtained by experimental method
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