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	Sequential injection spectrophotometric determination of nanomolar nitrite in seawater by on-line preconcentration with HLB cartridge
	ZHANG Min; YUAN Dongxing; HUANG Yongming; CHEN Guohe; ZHANG Zhen
来源期刊	Acta Oceanologica Sinica
ISSN	0253-505X
出版年	2010
卷号	29 期号:1 页码:100-107
英文摘要	The unstable state of nitrite results in its very low concentration in seawater, which is below the limit of detection (LOD) of conventional techniques of analysis. Some sensitivity-enhanced methods have been proposed for the determination of nitrite at nanomolar level to illustrate the role of nitrite in the marine nitrogen cycle. However, most of previous reports are not widely accepted, because of their complexity and cost equipment or intensive labor requirement. In this study, a simple automatic system for the determination of nanomolar level nitrite using on-line preconcentration with spectrophotometric detection was described. An Oasis HLB cartridge was adopted to quantitatively enrich the pink-colored azo compound, formed from nitrite via Griess reaction. The cartridge was rinsed with water and ethanol (volume fraction is 55%, the same below), in turn, then eluted by an eluent containing 50% ethanol and 0.25 M(mol/dm~3) H_2SO_4, and determined at 543 nm with a 2 cm path-length flow cell. Under the optimized experimental conditions, the calibration curve showed a good linearity in the range of 1.4-85.7 nM, and the LOD (3sigma) was estimated to be 0.5 nM. The relative standard deviations of 7 measurements were 4.0% and 1.0% for the samples spiked at 7.1 and 28.6 nM, respectively. The recoveries for the different natural water samples were between 92.2%-108.4%. Each HLB cartridge could be reused for at least 50 times. As compared with other SPE methods, the advantages of this method included the free of interference from salinity variation and less sample consuming. The results of the application of the proposed method to natural water showed good agreement with liquid waveguide capillary cell detection method.
英文关键词	nitrite seawater on-line preconcentration sequential injection solid phase extraction
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Oceanography
CSCD记录号	CSCD:3804497
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335036
作者单位	ZHANG Min, Environmental Science Research Center,Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, Fujian 361005, China.; YUAN Dongxing, Environmental Science Research Center,Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, Fujian 361005, China.; HUANG Yongming, Environmental Science Research Center,Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, Fujian 361005, China.; CHEN Guohe, Environmental Science Research Center,Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, Fujian 361005, China.; ZHANG Zhen, Environmental Science Research Center,Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, Fujian 361005, China.
推荐引用方式 GB/T 7714	ZHANG Min,YUAN Dongxing,HUANG Yongming,et al. Sequential injection spectrophotometric determination of nanomolar nitrite in seawater by on-line preconcentration with HLB cartridge[J],2010,29(1):100-107.
APA	ZHANG Min,YUAN Dongxing,HUANG Yongming,CHEN Guohe,&ZHANG Zhen.(2010).Sequential injection spectrophotometric determination of nanomolar nitrite in seawater by on-line preconcentration with HLB cartridge.Acta Oceanologica Sinica,29(1),100-107.
MLA	ZHANG Min,et al."Sequential injection spectrophotometric determination of nanomolar nitrite in seawater by on-line preconcentration with HLB cartridge".Acta Oceanologica Sinica 29.1(2010):100-107.