Mechanisms for metal nodule formation on sediment surfaces of limed lakes

GSTDTAP > 气候变化

	Mechanisms for metal nodule formation on sediment surfaces of limed lakes
	Hindar, Atle; Couture, Raoul-Marie; Eriksen, Tor Erik; Rognerud, Sigurd
	2015
出版年	2015
语种	英语
国家	挪威
出版者	Norsk institutt for vannforskning
领域	气候变化
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.
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
URL	查看原文
来源平台	Center for International Climate and Environmental Research-Oslo (CICERO)
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/2092
专题	气候变化
推荐引用方式 GB/T 7714	Hindar, Atle,Couture, Raoul-Marie,Eriksen, Tor Erik,et al. Mechanisms for metal nodule formation on sediment surfaces of limed lakes:Norsk institutt for vannforskning,2015.