Characterization of spectral responses of humic substances upon UV irradiation using two-dimensional correlation spectroscopy

Hur, Jin; Jung, Ka-Young; Jung, Young Mee

doi:10.1016/j.watres.2011.03.013

Cited by 133 publications

(50 citation statements)

References 29 publications

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“…With the Vis + UVA + UVB treatment, SUVA 254 increased from 2.83 to 3.54 L/ mg C·m after four days solar exposure. Previous research has shown that photodegradation of Suwannee River fulvic acid and eutrophic lake-derived DOM resulted in an overall decrease in SUVA 254 (Hur et al, 2011;Xu and Jiang, 2013). The reduction in SUVA 254 was explained by the preferential removal of aromatic chromophores and/or degradation of aromatic compounds to generate non-UV-absorbing DOM photo-products.…”

Section: Change Of Doc and Absorbance Under Irradiationmentioning

confidence: 97%

“…This finding suggests that the effect of photodegradation on DOM aromaticity depends on the composition of DOM exposed to sunlight. The photodegradation of Suwannee River fulvic acid and phytoplankton-derived DOM (Hur et al, 2011;Xu and Jiang, 2013) resulted in an overall decrease in DOM aromaticity, however the PARAFAC models employed to characterize these DOM types did not contain a component resembling that of C2 which is presumed to generate C4-type components with photo-exposure.…”

Section: Changes Of Eem-parafac Components In Three Light Treatmentsmentioning

confidence: 99%

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Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

Zhang

Chen

et al. 2016

Science of The Total Environment

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Due to climate change, tree line advance is occurring in many alpine regions. Within the next 50 to 100years, alpine lake catchments are expected to develop increased vegetation cover similar to that of sub-alpine lake catchments which currently exist below the tree line. Such changes in vegetation could trigger increased allochthonous DOM inputs to alpine lakes. To understand the fate of allochthonous DOM in alpine lakes impacted by climate change, the photochemical reactivity of DOM in sub-alpine Lake Tiancai (located 200m below the tree line) was investigated by excitation emission matrix fluorescence combined with parallel factor analysis (EEM-PARAFAC) and UV-Vis spectra analysis. With photo-exposure, a decrease in apparent DOM molecular weight was observed and 32% DOM was photomineralized to CO2. Interestingly, the aromaticity of DOM increased after photodegradation, as evidenced by increases in both the specific UV absorbance at 254nm (SUVA254) and the humification index (HIX). Five EEM-PARAFAC components were identified, including four terrestrially-derived substances (C1, C2, C3 and C4; allochthonous) and one tryptophan-like substance (C5; autochthonous). Generally, allochthonous DOM represented by C2 and C3 exhibited greater photoreactivity than autochthonous DOM represented by C5. C4 was identified as a possible photoproduct with relatively high aromaticity and photorefractive tendencies and contributed to the observed increase in SUVA254 and HIX. UV light facilitated the photodegradation of DOM and had the greatest effect on the removal of C3. This study provides information on the transformation of EEM-PARAFAC components in a sub-alpine lake, which is important in understanding the fate of increased allochthonous DOM inputs to alpine lakes impacted by climate change.

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Section: Change Of Doc and Absorbance Under Irradiationmentioning

confidence: 97%

Section: Changes Of Eem-parafac Components In Three Light Treatmentsmentioning

confidence: 99%

Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

Zhang

Chen

et al. 2016

Science of The Total Environment

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“…NOM can generally be divided into two components, namely, hydrophobic or humic substances (HS) and hydrophilic or non-humic substances (non-HS) (Scapini et al, 2013). The specific ultraviolet absorbance at 254 nm (SUVA -254) technique is used to identify whether the water contains HS or non-HS (Hur et al, 2011;Meng et al, 2013;Nkambule et al, 2012;Zazouli et al, 2007). SUVA is calculated as follows (Nkambule et al, 2012;Selburg et al, 2011):…”

Section: Introductionmentioning

confidence: 99%

A study of seasonal effects on metal-NOM interactions and the impact of CaCO<sup>3</sup> precipitation potentials using Visual MINTEQ, in raw and cooling water

Parshotam¹,

Gericke²,

Ngila³

et al. 2016

WSA

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This paper reports on a study of calcium carbonate (CaCO 3 ) precipitation potentials of cooling water (CW) at Eskom power stations. It is important to understand the complexation reaction between calcium and dissolved organic carbon (Ca-DOC) because the natural organic matter (NOM) affects the precipitation potentials of CaCO 3 . Secondly, it is necessary to understand the nature of the organic matter in the cooling and raw water. This study was carried out in raw and cooling water samples collected from Lethabo and Kriel power stations. These power stations obtain their cooling water from the Vaal River and Usuthu schemes, respectively. The DOC concentration in both water systems was higher in winter (little/no rainfall) as compared to spring (more rainfall). Specific ultraviolet absorption (SUVA) was calculated for the raw and cooling water for both stations. The SUVA results obtained for the raw water (RW) indicated that the NOM had a high degree of aromaticity (humic substances), whereas for the recycled CW the NOM present was found to be less aromatic. The Visual MINTEQ data for the winter sampling indicated that both Lethabo and Kriel were supplied by raw water that was under-saturated with respect to CaCO 3 , with saturation indices (SI) of −0.29 and −0.43, respectively. In addition, the % Ca-DOC in the raw water at Lethabo was 2.01 compared to 3.08 in the raw water at the Kriel plant. Therefore this study gives an indication that % Ca-DOC is one of the factors that affect the CaCO 3 precipitation potentials. The difference in SUVA-254 values for both stations has been identified and requires further investigation. The SUVA values help in identifying the type of fractions that make up the NOM. The interaction between calcium/magnesium and NOM determines the potential for CaCO 3 to form scale in condenser tubes carrying cooling water in the power generation plants at Eskom.

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“…The generalized 2DCOS can elucidate information in spectral variations, e.g., IR (Kim et al, 2006b; Cerdà-Costa et al, 2009; Huang et al, 2009; Unger et al, 2009, 2011; Del Río et al, 2010; Huang and Kuo, 2010; Jelèić et al, 2010; Jia et al, 2010; Lee et al, 2010, 2012; Peng et al, 2010; Popescu and Vasile, 2010, 2011; Zheng et al, 2010; Cheng et al, 2011; Jin et al, 2011; Kuo and Liu, 2011; Musto et al, 2011; Quaroni et al, 2011; Wang and Wu, 2011; Zhang et al, 2011; Ando et al, 2012; Qu et al, 2012; Su et al, 2012; Wu et al, 2012; Chai et al, 2013; Lai and Wu, 2013; Park et al, 2013; Shinzawa et al, 2013; Wang et al, 2013, 2014; Galizia et al, 2014; Hou et al, 2014; Noda, 2014c; Seo et al, 2014), Raman (Radice et al, 2010; Tang et al, 2010; Ma et al, 2011; Ji et al, 2012; Pazderka and Kopecký Jr, 2012; Brewster et al, 2013; Grzeszczuk et al, 2013; Noda, 2014d), terahertz (THz) (Hoshina et al, 2012, 2014), X-ray (Guo et al, 2011), UV-Vis (Hong et al, 2005; Jiang and Wu, 2008; Sikirzhytski et al, 2012; Zhong et al, 2012), NMR (Oh et al, 2009; Li et al, 2013), fluorescence (Hur et al, 2011; Zhang et al, 2013), and even chromatography (Izawa et al, 2001), under various external perturbations, such as thermal, electrical, optical, magnetic, and chemical perturbations (Noda, 1986, 1993; Hong et al, 2005; Kim et al, 2006b; Jiang and Wu, 2008; Cerdà-Costa et al, 2009; Huang et al, 2009; Oh et al, 2009; Unger et al, 2009; Del Río et al, 2010; Huang and Kuo, 2010; Jelèić et al, 2010; Jia et al, 2010; Lee et al, …”

Section: Introductionmentioning

confidence: 99%

Two-dimensional correlation spectroscopy in polymer study

2015

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This review outlines the recent works of two-dimensional correlation spectroscopy (2DCOS) in polymer study. 2DCOS is a powerful technique applicable to the in-depth analysis of various spectral data of polymers obtained under some type of perturbation. The powerful utility of 2DCOS combined with various analytical techniques in polymer studies and noteworthy developments of 2DCOS used in this field are also highlighted.

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Characterization of spectral responses of humic substances upon UV irradiation using two-dimensional correlation spectroscopy

Cited by 133 publications

References 29 publications

Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

A study of seasonal effects on metal-NOM interactions and the impact of CaCO<sup>3</sup> precipitation potentials using Visual MINTEQ, in raw and cooling water

Two-dimensional correlation spectroscopy in polymer study

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