کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11008193 | 1840468 | 2019 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A multidisciplinary investigation on bio-oxidation gold mine tailings from Dandong, China as a potential arsenic pollution source
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Very little is known about bio-oxidation tailings as an arsenic (As) pollution source. A comparison study was carried out between three flotation tailings (N1-1, N1-2 and N1-3) and three bio-oxidation tailings (N2-1, N2-2 and N2-3), collected from the Yangshu gold mine in China. A combined approach of mineralogy, geochemistry and environmental geochemistry was applied to explore geochemical and mineralogical properties, As fractions and its release behavior of the bio-oxidation tailings. The results showed that extremely high total As (TAs) of 25,200-27,100â¯Î¼g/g (air-dry weight) observed in N2-1, N2-2 and N2-3 was about 30 times higher than that (616-940â¯Î¼g/g) in N1-1, N1-2 and N1-3. The main elements were As, Ca, Fe and S, the mineral phases were gypsum (CaSO4) (accounting for >95â¯wt%), and the corresponding As was present as FeAsS and As2O5 in N2-1, N2-2 and N2-3. A larger amount of As in the water-soluble (5.80-9.98â¯Î¼g/g), exchangeable (9.42-15.70â¯Î¼g/g), carbonate-bound (29.23-63.36â¯Î¼g/g) and Fe/Mn oxide-bound (5825-12,218â¯Î¼g/g) fractions was found in N2-1, N2-2 and N2-3. Solution TAs released from N2-2 was higher than the level released from N1-1, and predominantly present in the oxidised form as arsenate As(V) in 192â¯h. The bio-oxidation tailings are able to release more As, and are a potential As pollution source of soil, surface and ground water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geochemical Exploration - Volume 196, January 2019, Pages 33-41
Journal: Journal of Geochemical Exploration - Volume 196, January 2019, Pages 33-41
نویسندگان
Guoxin Huang, Ximing Luo, Daming Li, Zhitao Li, Zhaoxin Chen, Ming Zhu,