Development of Hg-Au Microelectrode for measuring O-2,Mn2+,Fe2+, and S2- in marine sediment pore water

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	Development of Hg-Au Microelectrode for measuring O-2,Mn2+,Fe2+, and S2- in marine sediment pore water
	Si,JY ; Xu,KM ; Xu KM(许昆明)
刊名	http://dx.doi.org/10.1016/S1872-2040(07)60075-9
	2007-08
关键词	MN
英文摘要	Hg-Au voltammetric microelectrodes were developed by electroplating mercury membrane onto An microelectrodes. The An electrode was constructed by sealing one end of a 100 mu m diameter gold wire within a glass capillary using epoxy and attaching the other end to a silver wire for electrical contact using conductive epoxy. The silver wire was fastened to the top of the glass tube using epoxy again. The tip of the electrode was,ground flat and smooth gradually from coarse to fine grain under a micropolisher. It was then washed with 1 mol/L HNO3 solution and in deionized water under supersonic action. The electrode was electroplated with a layer of mercury within 0.1 mol/L Hg(NO3)(2)-0.03 mol/L HNO3 electrolyte at a potential of -0.10 V versus saturated calomel electrode (SCE) for 5 min. By adopting three-electrode cell and square wave voltammetry, Hg-Au microelectrode can measure dissolved oxygen, Mn2+, Fe2+ and sulfide (luring a single potential scan from -0.10 V to -1.75 V versus saturated calomel electrode. Experimental results indicated that the microelectrode has the sensitivity and detection limit of 0.16 nA/(mu mol/L), 6 mu mol/L for dissolved oxygen; 0.35 nA/(mu mol/L), 3 mu mol/L for Mn2+ 0.22 nA/(mu mol/L), 5 mu mol/L for Fe2+ and 34 nA/(mu mol/L) 0.03 mu mol/L for sulfide. It was found that the microelectrode exhibits good reproducibility with an error of within 3% after measuring 15 sediment samples consecutively.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/60768]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Si,JY,Xu,KM,Xu KM. Development of Hg-Au Microelectrode for measuring O-2,Mn2+,Fe2+, and S2- in marine sediment pore water[J]. http://dx.doi.org/10.1016/S1872-2040(07)60075-9,2007.
APA	Si,JY,Xu,KM,&许昆明.(2007).Development of Hg-Au Microelectrode for measuring O-2,Mn2+,Fe2+, and S2- in marine sediment pore water.http://dx.doi.org/10.1016/S1872-2040(07)60075-9.
MLA	Si,JY,et al."Development of Hg-Au Microelectrode for measuring O-2,Mn2+,Fe2+, and S2- in marine sediment pore water".http://dx.doi.org/10.1016/S1872-2040(07)60075-9 (2007).