Iron speciation and mineral characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, United Kingdom

	Iron speciation and mineral characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, United Kingdom
	Zheng, Guodong 1,2,3; Kuno, Akihito 4; Mahdi, Talib A.2; Evans, David J.5; Miyahara, Masaaki 3,6; Takahashi, Yoshio 3; Matsuo, Motoyuki 4; Shimizu, Hiroshi 3
刊名	GEOCHEMICAL JOURNAL
	2007
卷号	41 期号:6 页码:463-474
关键词	iron oxide carbonation arsenic coal mining drainage Neath canal sediments
ISSN号	0016-7002
文献子类	Article
英文摘要	In the early 1990's, the Neath Canal in South Wales, UK, received large amounts of drainage waters from nearby coal mines, which contributed to its contamination by heavy metals and arsenic. One sediment core and surface sediments were collected from the upstream section of the Neath Canal and characterized for their mineral composition and iron speciation using powder X-ray diffraction (XRD) and Mossbauer spectroscopy. The sediments show three distinctive layers that are defined by their physical properties including color, sediment components and dryness. The upper layer of the sediment (0-22 cm) is a reddish-brown wet precipitate dominated by iron oxides and hydroxides and a high content of arsenic. The middle layer (22-27 cm) is a soft wet deposit of yellow color which mainly contains calcite with sheet silicates (kaolinite) and goethite. Magnesium, calcium and manganese are enriched in this layer whereas iron is depleted compared to the upper layer. The lower part of the core (below 27 cm) is colored gray to dark gray and contains quartz, pyrite and clay minerals, similar to normal aquatic sediments. In addition, this layer also contains abundant coal particles. Silicon, aluminium, titanium, potassium, phosphorus and sodium concentrations are higher whereas iron, manganese, calcium and magnesium are lower in the lower portion of the core compared to the middle and upper layers. Mineral composition, major elements, and iron speciation indicate oxic conditions in the upper and middle layers whereas reducing conditions prevail in the lower layer, which likely control the distribution of hazardous elements. Given the variation of physico-chemical characteristics of the sediments with depth in the canal, different remediation treatments will likely be necessary for each layer of sediments.
WOS关键词	AQUEOUS WASTE STREAMS ; MARINE-SEDIMENTS ; HEAVY-METALS ; MOSSBAUER-SPECTROSCOPY ; BITUMINOUS COALS ; PYRITE FORMATION ; TRACE-ELEMENTS ; CEMENT ; IMMOBILIZATION ; CARBONATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	GEOCHEMICAL SOC JAPAN
WOS记录号	WOS:000252342000006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67538]
专题	中国科学院地质与地球物理研究所
通讯作者	Zheng, Guodong
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Gas Geochem, Lanzhou 730000, Peoples R China 2.Cardiff Univ, Sch Engn, GRC, Cardiff CF24 3AA, Wales 3.Hiroshima Univ, Dept Earth & Planetary Syst Sci, Higashihiroshima 7398526, Japan 4.Univ Tokyo, Grad Sch Arts & Sci, Tokyo 1538902, Japan 5.John Innes Ctr Plant Sci Res, Dept Biol Chem, Norwich NR4 7UH, Norfolk, England 6.Tohoku Univ, Grad Sch Sci, Inst Mineral Petrol & Econ Geol, Sendai, Miyagi 9808578, Japan
推荐引用方式 GB/T 7714	Zheng, Guodong,Kuno, Akihito,Mahdi, Talib A.,et al. Iron speciation and mineral characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, United Kingdom[J]. GEOCHEMICAL JOURNAL,2007,41(6):463-474.
APA	Zheng, Guodong.,Kuno, Akihito.,Mahdi, Talib A..,Evans, David J..,Miyahara, Masaaki.,...&Shimizu, Hiroshi.(2007).Iron speciation and mineral characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, United Kingdom.GEOCHEMICAL JOURNAL,41(6),463-474.
MLA	Zheng, Guodong,et al."Iron speciation and mineral characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, United Kingdom".GEOCHEMICAL JOURNAL 41.6(2007):463-474.