Abstract：
:Mine tailings have been analyzed by a sequential extraction procedure after their pre-treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2.7 V cm-1. Four leaching solutions were tested: H₂SO₄ + HNO₃ (2:1 vol.) pH = 1.9; H₂SO₄ + HNO₃ (2:1 vol) pH = 4.2; NH₄Cl 0.8M, pH = 5.5 and 30% H₂O₂ adjusted to pH 2 with HNO₃ 1M + HCl 1M. After the treatment, the tailings were divided in six slices from anode to cathode. The highest removal efficiency of copper was obtained with H₂SO₄ + HNO₃ pH = 1.9, which allows one to remove 67% of the copper in the total cell and 85% of the copper in the slice closest to anode. The same solution with pH = 4.2 allows one to remove 62% of the total copper. The analysis realized by the sequential extraction method indicates the easy removal of water-soluble and exchangeable fractions in all experiments, moreover, residual and sulfide are the less mobile fractions. The general trend was the movement of copper associated to different fractions from anode to cathode and its accumulation closest to the cathode in the case of exchangeable, Fe-Mn oxides and acid soluble fractions, possibly due to some precipitation of copper compounds associated with less acidic conditions.
journal_name
Int J Environ Res Public Healthauthors
Lazo A,Hansen HK,Lazo P,Gutiérrez Cdoi
10.3390/ijerph16040584subject
Has Abstractpub_date
2019-02-18 00:00:00issue
4eissn
1661-7827issn
1660-4601pii
ijerph16040584journal_volume
16pub_type
杂志文章abstract：:The U.S. has merely 4% of the world population, but contains 25% of the world's COVID-19 cases. Since the COVID-19 outbreak in the U.S., Massachusetts has been leading other states in the total number of COVID-19 cases. Racial residential segregation is a fundamental cause of racial disparities in health. Moreover, di...
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