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	Flow injection analysis of ultratrace orthophosphate in seawater with solid-phase enrichment and luminol chemiluminescence detection
	Liang, Ying ; Yuan, Dongxing ; Yuan DX(袁东星) ; Li, Quanlong ; Li QL(李权龙) ; Lin, Qingmei ; Lin QM(林庆梅)
	2006-07-07
关键词	Sep-Pak C18 on-line solid-phase extraction orthophosphate molybdophosphoric heteropoly acid cetyltrimethylammonium bromides luminol chemiluminescence
英文摘要	Solid-phase extraction technique had been applied to extract molybdophosphoric heteropoly acid (MoP) paired with cetyltrimethylammonium bromide (CTAB) from seawater matrix using C18 sorbent. Chemiluminescence emission could be generated via MoP reaction with alkaline luminol. Based on these, a novel on-line solid-phase extraction method coupled with flow injection (FI) analysis and luminol chemiluminescence detection had been established to determine ultratrace orthophosphate in seawater. The MoP-CTAB compound could be efficiently extracted on an in-line Sep-Pak C18 cartridge, and rapidly eluted by 0.3 mol l(-1) sulphuric acid-ethanol solution. Then the compound was reduced by luminol to produce chemiluminescence light, which could be detected using a luminescence analyzer. Experimental parameters were optimized using a univariate experimental design. Using artificial seawater with salinity of 35 as a matrix, the standard curve with a linear range between 0.005 and 0.194 mu mol l(-1) had been obtained, and the recovery and the detection limit of the proposed method were found to be 92.5% and 0.002 mu mol l(-1), respectively. The relative standard deviation (R.S.D.), which was determined over eight hour, was 4.66% (n = 7) for the artificial seawater at a concentration of 0.097 mu mol l(-1) orthophosphate. Si of 200 mu mol l(-1) would not interfere with the detection of 0.012 mu mol l(-1) orthophosphate compound. Three typical seawater samples were analyzed using both the proposed method and the magnesium hydroxide-induced coprecipitation (MAGIC) method, and the results of the two methods showed no significant difference using the t test. Compared to the MAGIC method, the proposed method was more sensitive, time saving and easy for on-line analysis. (c) 2006 Published by Elsevier B.V.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.aca.2006.04.036]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Liang, Ying,Yuan, Dongxing,Yuan DX,et al. Flow injection analysis of ultratrace orthophosphate in seawater with solid-phase enrichment and luminol chemiluminescence detection[J],2006.
APA	Liang, Ying.,Yuan, Dongxing.,袁东星.,Li, Quanlong.,李权龙.,...&林庆梅.(2006).Flow injection analysis of ultratrace orthophosphate in seawater with solid-phase enrichment and luminol chemiluminescence detection..
MLA	Liang, Ying,et al."Flow injection analysis of ultratrace orthophosphate in seawater with solid-phase enrichment and luminol chemiluminescence detection".(2006).

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