Total luminescence spectra of IHSS standard and reference fulvic acids, humic acids and natural organic matter:: comparison of aquatic and terrestrial source terms
Total luminescence spectra of IHSS standard and reference fulvic acids, humic acids and natural organic matter:: comparison of aquatic and terrestrial source terms
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DOI：
10.1016/j.orggeochem.2003.11.007
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发表时间：
2004-01-01
影响因子：
3
通讯作者：
Takács, M
中科院分区：
文献类型：
--
作者：
Alberts, JJ;Takács, M
对国际腐植酸协会标准和参考文献中的黄腐酸(6种)、胡敏酸(7种)和天然有机物(2种)样品进行了总发光荧光光谱(TLS)研究。两个峰通常表征所有水生样品和陆地黄腐酸的光谱，其中一个在光谱的紫外区具有激发波长(约250 nm)，另一种位于可见光区，波长范围从320到450 nm。然而，陆地腐殖酸光谱包含一个位于相对于水生样品和陆地黄腐酸的更长的激发-发射波长对(EEWP)的波长峰，以及其他样品中没有的其他峰。黄腐酸的相对荧光强度(RFI)显著大于胡敏酸。相对于腐植酸，黄腐酸的相对荧光量子效率(RQE)再次显著增加，而天然有机物(NOM)的相对荧光量子效率介于黄腐酸和胡敏酸之间，RFI数据就是如此。尽管气候和生态系统类型有显著差异，但从美国东南部和挪威分离的水生黄腐酸、水生腐殖酸或天然有机物的光谱没有系统差异。(C)2003爱思唯尔有限公司。保留所有权利。
Fulvic acids (6), humic acids (7) and natural organic matter (2) samples from the International Humic Substances Society Standards and Reference Collection were studied by total luminescence fluorescence spectroscopy (TLS). Two peaks generally characterize the spectra of all aquatic samples and the terrestrial fulvic acids, one with excitation wavelengths in the ultraviolet region of the spectrum (approx. 250 nm) and the other in the visible region of the spectrum with a broad range from 320 to 450 run. However, terrestrial humic acid spectra contained one wavelength peak located at longer excitation-emission wavelength pairs (EEWP) relative to the aquatic samples and terrestrial fulvic acids, and other peaks that were not represented in the other samples. The relative fluorescence intensities (RFI) were significantly greater for fulvic acids than for humic acids. Relative fluorescence quantum efficiencies (RQE) were again significantly greater for the fulvic acids relative to humic acids, while the RQE of the natural organic matter (NOM) samples were intermediate between the fulvic and humic acids as was the case with the RFI data. Despite significant differences in climate and ecosystem types, no systematic differences were observed in the spectra of aquatic fulvic acids, aquatic humic acids or natural organic matter isolated from the southeastern US and Norway. (C) 2003 Elsevier Ltd. All rights reserved.