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	A modified analytical method for the shipboard determination of nanomolar concentrations of orthophosphate in seawater
	Ma, Jian ; Yuan, Dongxing ; Yuan DX(袁东星) ; Liang, Ying ; Dai, Minhan ; Dai MH(戴民汉)
	2008-06
关键词	shipboard orthophosphate magnesium hydroxide-induced coprecipitation on-line solid phase extraction
英文摘要	A method for the determination of nanomolar concentrations of orthophosphate in oligotrophic seawater developed by Liang et al. (2007) has been modified to make it fully feasible for shipboard application and for faster sample throughput with minimized sample volume. The technique is based on the flow injection method with solid phase extraction on a Sep-Pak C18 cartridge and colorimetric detector. The Schlieren effect was minimized by rinsing the cartridge sequentially with 5 mL water and 2 mL 95% ethanol solution. With three micro pumps in parallel, savings of up to 80% in amount of reagents and 25% volume of seawater samples could be achieved in comparison to the previous method. Variation of stopped flow time and sample loading time gave 3 different standard curves, which corresponded to 3 linear ranges within 3.4 and 515 nM. The modified method permits the analysis of samples over a wide range of concentrations, and has been successfully applied to shipboard determination of trace orthophosphate in more than 200 seawater samples during a one-month cruise in the South China Sea. For seawater at concentrations of 20.6, 82.5, 206.2 nM orthophosphate, the relative standard deviations (RSD) (n = 6), determined daily for 6 days on board ship were 4.45%, 4.73% and 6.75%, respectively. Five seawater samples collected in the Station SEATS (South East Asia Time Series Station at 18 degrees N, 116 degrees E) were analyzed using the present method both on board and in a land-based laboratory, as well as with the magnesium hydroxide-induced coprecipitation (MAGIC) method, and showed no significant difference according to the statistical t-test.
语种	英语
出版者	SPRINGER
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/8884]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Ma, Jian,Yuan, Dongxing,Yuan DX,et al. A modified analytical method for the shipboard determination of nanomolar concentrations of orthophosphate in seawater[J],2008.
APA	Ma, Jian,Yuan, Dongxing,袁东星,Liang, Ying,Dai, Minhan,&戴民汉.(2008).A modified analytical method for the shipboard determination of nanomolar concentrations of orthophosphate in seawater..
MLA	Ma, Jian,et al."A modified analytical method for the shipboard determination of nanomolar concentrations of orthophosphate in seawater".(2008).

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