臺灣東北部濂洞灣海水與酸性礦山排水反應沉澱懸浮粒之礦物學分析

Translated title of the contribution: Mineralogical analyses of suspended particulates in seawater reacted with an acid mine drainage in Lian-Dong Bay, northeastern Taiwan

Chun-Jung Chen, Wei-Teh Jiang

Research output: Contribution to journalArticlepeer-review

Abstract

An acid mine drainage (AMD) (pH 2.8) discharged from the Penshan 7th adit is released into Lian-Dong Bay through a channel in the Chinkuashih mining district. A substantial quantity of AMD precipitates has been formed at the adit and in the channel. In addition, abundant suspended particulates occur in the estuary and inshore Lian-Dong Bay. X-ray diffraction, Fourier transform infrared spectroscopy, and electron microscopy showed that the AMD precipitates was dominated by schwertmannite globular aggregates with a hedgehog-like surface microstructure, that the estuarine suspended particulates were short nanorods consisting of schwertmannite and subordinate goethite, and that the inshore suspended particulates were composed of non-crystalline hydrous iron and aluminum oxides (HFO and HAO) with a trace of schwertmannite, in the form of nanoballs. These precipitates were not only very different in microtextures but also distinguishable from the compositions of dissolved solids. The AMD precipitates were enriched in As, Cr, Pb, Fe, and S. As
the pH increased by mixing with seawater, the suspended particulates formed with relatively high Al, Si, Cu, Zn, Mn, Ni, Co, and Cd contents. Such a sequence of elemental precipitation and adsorption was mainly influenced by the formation of HFO/HAO and changes in solution pH. Sequential co-precipitation and adsorption of the elements occurred at various stages throughout the neutralization processes. The inshore suspended particulates utilized Fe, Al, Si, and Cu as the principal constituents to form a non-crystalline HFO/HAO compound through co-precipitation, and took up other heavy metals and arsenic predominantly via adsorption. An understanding of the fate and transport of the suspended particulates in Lian-Dong Bay is of great environmental interest.
Translated title of the contributionMineralogical analyses of suspended particulates in seawater reacted with an acid mine drainage in Lian-Dong Bay, northeastern Taiwan
Original languageChinese
Pages (from-to)32-47
Number of pages16
JournalThe Taiwan Mining Industry
Volume65
Issue number4
Publication statusPublished - 2013 Dec

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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