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Xiao F.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources | Ni W.-S.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources | Mao X.-J.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources | Li X.-Z.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

The sample was fused with mixed flux, i.e., 1 g of sodium peroxide and 2 g of sodium hydroxide. The melt was leached with hot water. At this time, the elements including iron, calcium, titanium, lead, copper, zircon and rare earths were removed in the forms of hydroxide precipitates. The color interference of manganese was eliminated by adding little ethanol followed by boiling. With the pH of solution adjusted to 5.5-6.5 and in presence of total ionic strength adjustment buffer solution of trisodium citrate dihydrate-potassium nitrate, a method was established for determination of fluorine in ore by ion selective electrode method using bromocresol green as indicator. The experimental results showed that the negative logarithm of mass concentration of fluorine ion was linear to the corresponding potential (E). The correlation coefficient was r=0.999. The linear range was 0.2-20.0 μg/mL. The detection limit of method was 0.019 μg/mL. The further interference tests indicated that the elements in sample including silicon, aluminum, magnesium, calcium, zinc, phosphorus and chlorine did not interfere with the determination. The proposed method was applied to the determination of fluorine in ten types of ore certified reference materials(lithium ore, tantalum ore, molybdenum ore, tungsten ore, tin ore, phosphorus ore, zinc ore, tantalum ore, antimony ore, lead ore and copper ore). The results were consistent with the certified values. The relative standard deviations (RSD, n=6 or n=12) were between 0.30% and 5.0%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Ma Y.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources | Li F.,Henan University | Jiang Y.,Henan University | Yang W.,Henan University | And 3 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2016

Acidified hydrazine hydrate was used to remediate Cr(VI)-contaminated soil. The content of water-soluble Cr(VI) in contaminated soil was 4977.53 mg/kg. The optimal initial pH of hydrazine hydrate solution, soil to solution ratio and molar ratio of Cr(VI) to hydrazine hydrate for remediation of Cr(VI)-contaminated soil were 5.0, 3:1 and 1:3, respectively. Over 99.50 % of water-soluble Cr(VI) in the contaminated soil was reduced at the optimal condition within 30 min. The remediated soil can keep stable within 4 months. Meanwhile the total phosphorus increased from 0.47 to 4.29 g/kg, indicating that using of acidified hydrazine hydrate is an effective method to remediate Cr(VI)-contaminated soil. © 2016 Springer Science+Business Media New York


PubMed | Henan University, Design Science and Zhengzhou Institute of Multipurpose Utilization of Mineral Resources
Type: Journal Article | Journal: Bulletin of environmental contamination and toxicology | Year: 2016

Acidified hydrazine hydrate was used to remediate Cr(VI)-contaminated soil. The content of water-soluble Cr(VI) in contaminated soil was 4977.53mg/kg. The optimal initial pH of hydrazine hydrate solution, soil to solution ratio and molar ratio of Cr(VI) to hydrazine hydrate for remediation of Cr(VI)-contaminated soil were 5.0, 3:1 and 1:3, respectively. Over 99.50% of water-soluble Cr(VI) in the contaminated soil was reduced at the optimal condition within 30min. The remediated soil can keep stable within 4months. Meanwhile the total phosphorus increased from 0.47 to 4.29g/kg, indicating that using of acidified hydrazine hydrate is an effective method to remediate Cr(VI)-contaminated soil.

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