Influence of pH on fluorescent dissolved organic matter photo-degradation

Water Research
Stephen A TimkoWilliam J Cooper

Abstract

A novel semi-continuous excitation emission matrix (EEM) fluorescence and absorbance monitoring system has been developed. Full EEMs were collected simultaneously with absorbance spectra every 20 min during 24 h solar-simulated irradiation experiments, and the kinetic change of fluorescence of Suwannee River natural organic matter IHSS standard material (SRNOM) at various pH values was investigated. Parallel factor analysis (PARAFAC) was then used to isolate the photo-labile and pH-influenced fluorescent components of SRNOM. Kinetic analysis showed increasing rates of fluorescence loss with increasing pH. This has significant implications for the photo-degradation of dissolved natural organic matter during estuarine mixing, when large increases of pH are common. The influence of pH on fluorescence and photo-degradation kinetics emphasizes the need for pH to be monitored and accurately controlled during laboratory experiments. It is also highly recommended that when constructing PARAFAC models or monitoring changes in fluorescence data between samples of different origins, that the pH be held constant to remove any potential artifacts or misinterpretation of data.

References

Aug 10, 2004·Environmental Science & Technology·Rossana Del Vecchio, Neil V Blough
Mar 2, 2005·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ann M McNallyKristopher McNeill
Nov 22, 2005·Environmental Science & Technology·Rose M Cory, Diane M McKnight
Dec 31, 2005·Environmental Science & Technology·Rebecca Sutton, Garrison Sposito
Sep 20, 2008·Environmental Science & Technology·Deborah J DryerMassimiliano Fabbricino
Jan 8, 2011·Science·David BastvikenAlex Enrich-Prast
Nov 1, 1982·Environmental Science & Technology·D Dulin, T Mill
Apr 3, 2012·Environmental Science & Technology·Michael AeschbacherMichael Sander
Jul 20, 2012·Annual Review of Marine Science·Norman B Nelson, David A Siegel
Jan 5, 2014·Environmental Science & Technology·Charles M SharplessKristopher McNeill
Aug 2, 2014·Environmental Science & Technology·Brett A PoulinGeorge R Aiken
Sep 10, 2014·Water Research·Xi-Zhi NiuJean-Philippe Croué

❮ Previous
Next ❯

Citations

Feb 18, 2016·The Science of the Total Environment·Wei HeJin Hur
Feb 26, 2016·Environmental Science & Technology·Collin Ward, Rose Cory
Nov 24, 2016·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Guanglong LiuDuanwei Zhu
Jul 18, 2019·Chemistry : a European Journal·Daniel HemmlerPhilippe Schmitt-Kopplin
Mar 18, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Patrycja Boguta, Zofia Sokołowska
Oct 30, 2020·Environmental Pollution·Guangming WuZhiyuan Cong
Dec 22, 2020·Water Research·Urban J Wünsch, Kathleen Murphy
Aug 30, 2018·Environmental Science & Technology·K R MurphyC A Stedmon
Oct 30, 2021·Environmental Science & Technology·Jannis WenkSilvio Canonica

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.