Fluorescence Characterization of IHSS Humic Substances:  Total Luminescence Spectra with Absorbance Correction

Mobed, Jarafshan J.; Hemmingsen, Sherry L.; Autry, Jennifer L.; McGown, Linda B.

doi:10.1021/es960132l

Cited by 378 publications

(241 citation statements)

References 11 publications

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“…This technique has satisfactorily been used to characterize DOM in natural environments. Although the EEM spectroscopic approach has a greater density of spectral information than the traditional fluorescence approaches, it can demonstrate that quenching (or enhancement) of fluorescence intensity by proton and metal ions is quantitatively dissimilar in different regions of the fluorescence landscape [2,[17][18][19][20][21]. The EEM landscape has been typically characterized by noting the locations of one or more peaks that correspond to the maximum fluorescence intensities ("peak picking") [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Yan

et al. 2013

Journal of Luminescence

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a b s t r a c tThis study investigated the optical properties of dissolved organic matter (DOM) using the fluorescence excitation-emission matrix (EEM) method combined with parallel factor (PARAFAC) analysis. The examined DOM samples included Suwannee River fulvic acid (SRFA) and Nordic Reservoir natural organic matter (NRNOM). The optical properties of the DOM were determined from the behavior of individual groups of DOM fluorophores responding to different ionization states. The PARAFAC examination revealed that there were six independent EEM components in the SRFA that behaved differently in terms of pH influence on their fluorescence intensity. The dominant EEM peak locations (λ ex /λ em ) of these components were (

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Section: Introductionmentioning

confidence: 99%

Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Yan

et al. 2013

Journal of Luminescence

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“…Fluorescence in natural waters is predominantly generated by organic and amino acids, which derive from decomposed plant and animal material in the soil zone. Several studies have investigated the fluorescence of these materials in soils, rivers, groundwater, and marine waters [Senesi et al, 1991;Coble, 1996;Mobed et al, 1996; A. Baker and D. Genty, Fluorescence wavelength and intensity variations of cave waters, submitted to Journal of Hydrology, 1998.] These studies have revealed the presence of several intensity peaks in the fluorescence spectrum but with a predominant organic acid peak in soil extracts and terrestrial waters at an excitation and emission wavelength pair of 290-350:400-480 nm, ascribed to a probable fulvic acid source.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence intensity variations of speleothem‐forming groundwaters: Implications for paleoclimate reconstruction

Baker¹,

Mockler²,

Barnes³

1999

Water Resources Research

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Abstract. Groundwater discharges onto 16 speleothems and surface climate parameters have been measured in an oolitic limestone site in England. Groundwater recharge is demonstrated to lag behind periods of hydrologically effective precipitation by 30-50 days. With the exception of short periods of high rainfall intensity or quantity, summer rainfall has no effect on groundwater discharge onto the speleothems because of the development of a soil moisture deficit. The first groundwater fluorescence intensity increase was demonstrated to lag the autumn increase in groundwater discharge by 10-20 days, suggesting that the first groundwater comprises "old" stored groundwater, whereas later water derives from the overlying soil and has a high organic acid concentration. Despite the lags, the structure of autumn and winter moisture availability is reflected within the annual fluorescence intensity variations, suggesting that fluorescent organic acids, when trapped within speleothem calcite, may provide a proxy for past winter moisture variations for temperate latitudes. IntroductionFluorescence is the optical phenomena where excitation by a high-energy light source raises the energy levels of electrons within a molecule. These subsequently release this energy in the form of light; the emitted fluorescent light is at a longer wavelength than the excitation light. Fluorescence from organic material commonly comprises emission in the long wave ultraviolet (UV) and blue wavelengths (350-500 nm) after excitation by short or long wave UV light (200-400 nm). Fluorescence in natural waters is predominantly generated by organic and amino acids, which derive from decomposed plant Research presented in this paper was undertaken to answer some of the questions posed by these studies, in particular (1) to undertake a higher sampling frequency of groundwater fluorescence than previously obtained, for the duration of at least one annual hydrological cycle, in order to assess any climatic cause of winter fluorescence variability and (2) to undertake this sampling at multiple groundwater sources to assess the relationship between groundwater discharge and fluorescence properties and surface climate, in particular to assess whether different groundwater sources have different sensitivities to and lags with surface rainfall variations.Therefore, fluorescence intensity variations of 16 groundwater sources sampled at frequencies of 10-20 days within one hydrological system are presented here for the period November 1996 to April 1998. The fluorescence intensity variations contained within the speleothems associated with the groundwater sources investigated here will be discussed in a future paper. Site DescriptionThe site chosen to investigate the fluorescence intensity variations of groundwaters was Brown's Folly Mine, Bathford, southwest England (51ø23'W, 2ø22'N; National Grid Refer- 407

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“…Three-dimensional fluorescence spectroscopy (3DEEM) is a popular method in the component identification of CDOM and algae for its high sensitivity and small interference (Mobed et al, 1996;McKnight et al, 2001;Patel-Sorrentino et al, 2002;Leenheer and Croué, 2003;Murphy et al, 2008). With the development of fluorescence sensor, fluorescence-to-absorption algorithms to retrieve CDOM absorption became more and more significative.…”

Section: Introductionmentioning

confidence: 99%

Study of influencing factors to chromophoric dissolved organic matter absorption properties from fluorescence features in Taihu lake in autumn

Huang

Sun

et al. 2013

J Limnol

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In order to identify the components of chromophoric dissolved organic matter (CDOM) 19.93, 18.82, 16.88, 16.39, 12.26, and 15.72%, respectively is tryptophan-like, which is the product of phytoplankton and aquatic debris rather than the wastewater treatment drainaged from city. In this study, six fluorophores with multiple excitation-emission matrices (EEMs) peaks (A, B, C, N, M, T) were identified according to the parallel factor analysis (PARAFAC). The average contribution of each component to the CDOM is

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Fluorescence Characterization of IHSS Humic Substances: Total Luminescence Spectra with Absorbance Correction

Cited by 378 publications

References 11 publications

Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Study of the pH influence on the optical properties of dissolved organic matter using fluorescence excitation–emission matrix and parallel factor analysis

Fluorescence intensity variations of speleothem‐forming groundwaters: Implications for paleoclimate reconstruction

Study of influencing factors to chromophoric dissolved organic matter absorption properties from fluorescence features in Taihu lake in autumn

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