Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration

CORC > 厦门大学 > 海洋环境－已发表论文

	Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration
	Yi Yueyuan ; Zheng Airong ; Guo Weidong ; Yang Liyang ; Chen Ding ; Zheng AR(郑爱榕) ; Guo WD(郭卫东) ; Yang LY(杨丽阳)
刊名	http://dx.doi.org/10.1007/s13131-014-0451-4
	2014
关键词	PARALLEL FACTOR-ANALYSIS EMISSION MATRIX FLUORESCENCE MOLECULAR-WEIGHT CHESAPEAKE BAY TAIWAN STRAIT ABSORPTION OCEAN MARINE CARBON VARIABILITY
英文摘要	National Natural Science Foundation of China [41276064]; Chinese Scholarship Council Program; Program for New Century Excellent Talents (NCET); Fundamental Research Funds for the Central Universities [201112G011]; Dissolved organic matter (DOM) from freshwater, mid-salinity, and seawater endmember samples in the Jiulong River Estuary, China were fractionated using cross-flow ultraffitration with a 10-kDa membrane. The colloidal organic matter (COM; 10 kDa-0.22 mu m) retentate, low molecular weight (LMW) DOM (<10 kDa) permeate, and bulk samples were analyzed using absorption spectroscopy and three-dimensional fluorescence excitation-emission-matrix spectroscopy. The UV-visible spectra of COM were very similar to those obtained for permeate and bulk samples, decreasing monotonically with increasing wavelength. Most of the chromophoric DOM (CDOM, expressed as the absorption coefficient a(355)) occurred in the LMVV fraction, while the percentage of CDOM in the colloidal fraction was substantially higher in the freshwater endmember (13.4% of the total) than in the seawater endmember (6.8%). The bulk CDOM showed a conservative mixing behavior in the estuary, while there was removal of the COM fraction and a concurrent addition of the permeate fraction in the mid-salinity sample, implying that part of the colloidal CDOM was transformed into LMVV CDOM. Two humic-like components (Cl: <250, 325/402 nm; and C2: 265, 360/458 nm) and one protein-like component (C3: 275/334 nm) were identified using parallel factor analysis. The contributions of the Cl, C2, and C3 components of the COM fraction to the bulk sample were 2.5%-8.7%, 4.8%-12.6%, and 7.4%-14.7%, respectively, revealing that fluorescent DOM occurred mainly in the LMW fraction in the Jiulong River Estuary. The Cl and C2 components in the retentate and permeate samples showed conservative mixing behavior, but the intensity ratio of C2/C1 was higher in the retentate than in the permeate fractions for all salinity samples, showing that the humic component was more enriched in the COM than the fulvic component. The intensity ratio of C3/(C1+C2) was much higher in the retentate than in the permeate fraction for mid-salinity and seawater samples, revealing that the protein-like component was relatively more enriched in COM than the humic-like component. The contribution of the protein-like component (C3) to the total fluorescence in the retentate increased from 14% in the freshwater endmember to 72% for the seawater endmember samples, clearly indicating the variation of dominance by the humic-like component compared to the protein-like component during the estuarine mixing process of COM.
语种	英语
出版者	SPRINGER
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88145]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Yi Yueyuan,Zheng Airong,Guo Weidong,et al. Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration[J]. http://dx.doi.org/10.1007/s13131-014-0451-4,2014.
APA	Yi Yueyuan.,Zheng Airong.,Guo Weidong.,Yang Liyang.,Chen Ding.,...&杨丽阳.(2014).Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration.http://dx.doi.org/10.1007/s13131-014-0451-4.
MLA	Yi Yueyuan,et al."Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration".http://dx.doi.org/10.1007/s13131-014-0451-4 (2014).