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| Research on aqueous hydroxyl radical generated from minerals of dust fall in Tianshui |
| ZHANG Liu-fei1,2, DONG Fa-qin2, TAN Dao-yong2, SUN Shi-yong2, WANG Bin2 |
1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Mianyang 621010, China |
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Abstract The generation of aqueous hydroxyl radical from the dust fall, collected from Tianshui City, Gansu province, was investigated using the high performance liquid chromatography method. The mineral composition of dust fall was quartz (57.08%), calcite (27.79%), albite (10.29%), and muscovite (4.84%). The amount of generated hydroxyl radical from dust fall, simulated dust fall (including theoretical calculation method and physical mix method), and pure minerals were in the following order:calcite (1.30×10-10 mol)> simulated dust fall (calculation) (5.47×10-11 mol)> dust fall (5.34×10-11 mol)> quartz (2.90×10-11 mol)> muscovite (1.90×10-11 mol)> albite (1.09×10-11 mol)> dust fall (mix) (7.16×10-12 mol). The minerals in dust fall had the major contribution to the formation of hydroxyl radical. The discrepancy in the amount of the generated hydroxyl radical between dust fall and simulated dust fall was caused by mineral composition, the dissolution of metallic ions and organic compounds in water, the surface area of minerals, and the interactions between the mineral and the water media.
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Received: 16 July 2015
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