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报告题名:
Mechanisms for metal nodule formation on sediment surfaces of limed lakes
作者: Hindar, Atle; Couture, Raoul-Marie; Eriksen, Tor Erik; Rognerud, Sigurd
出版者: Norsk institutt for vannforskning
出版年: 2015
发表日期: 2015
国家: 挪威
语种: 英语
英文关键词: VDP::Matematikk og naturvitenskap: 400 ; VDP::Mathematics and natural scienses: 400 ; Innsjøsedimenter / Lake sediments ; Invertebrater / ryggradsløse dyr / Invertebrates ; Kalking / Liming ; Metallutfelling / Metal precipitation
中文主题词: 降水 ; 湖泊 ; 沉积物 ; PH ; 金属 ; PH值
主题词: PRECIPITATION ; LAKES ; SEDIMENTS ; PH ; METALS
英文摘要: The water chemical and biological effects of liming have been fairly well documented. One of the research projects revealed relatively large (up to 1-3 cm in diameter) metal nodules on the sediment surface of some of the limed lakes. Here, we report on results for sediment and porewater metal content and densities of profundal macroinvertebrates from an in-depth investigation of two of 17 previously examined limed lakes. Trace element concentrations (especially of Mo and U) in Djupøyungen sediments are especially high, probably caused by the sulphide-containing bedrock, typical for the area. The metals in the sediment porewater are characterised by their association with Fe and Mn oxides and sulphides (Co, As and Mo) or S (U) and diagenetic separation (Cd and Mn). Significant Mn enrichment is probably due to facilitated precipitation of Mn oxides at the increased pH after liming. Gentle flushing of grab samples revealed a total dominance of Mn and Fe nodules on the sediment surface in some parts of Breisjøen. Although comparisons with Norwegian and other guidelines for sediments indicate that the measured concentrations for some of the metals are significantly above acceptable limits, data from only one of the sampling sites indicate effects on invertebrates. Residual Ca from the liming may protect the biota from negative effects.
URL: https://brage.bibsys.no/xmlui/bitstream/handle/11250/301393/6875-2015_200dpi.pdf?sequence=4&isAllowed=y
资源类型: 研究报告
标识符: http://119.78.100.158/handle/2HF3EXSE/29166
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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Recommended Citation:
Hindar, Atle,Couture, Raoul-Marie,Eriksen, Tor Erik,et al. Mechanisms for metal nodule formation on sediment surfaces of limed lakes. 2015-01-01.
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