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Linking Optical and Chemical Properties of Dissolved Organic Matter in Natural Waters

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889450817 Year: Pages: 242 DOI: 10.3389/978-2-88945-081-7 Language: English
Publisher: Frontiers Media SA
Subject: Chemistry (General) --- Geography --- Oceanography --- Science (General)
Added to DOAB on : 2017-07-06 13:27:36
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Abstract

A substantial increase in the number of studies using the optical properties (absorbance and fluorescence) of dissolved organic matter (DOM) as a proxy for its chemical properties in estuaries and the coastal and open ocean has occurred during the last decade. We are making progress on finding the actual chemical compounds or phenomena responsible for DOM’s optical properties. Ultrahigh resolution mass spectrometry, in particular, has made important progress in making the key connections between optics and chemistry. But serious questions remain and the last major special issue on DOM optics and chemistry occurred nearly 10 years ago. Controversies remain from the non-specific optical properties of DOM that are not linked to discrete sources, and sometimes provide conflicting information. The use of optics, which is relatively easier to employ in synoptic and high resolution sampling to determine chemistry, is a critical connection to make and can lead to major advances in our understanding of organic matter cycling in all aquatic ecosystems. The contentions and controversies raised by our poor understanding of the linkages between optics and chemistry of DOM are bottlenecks that need to be addressed and overcome.

Selenium Isotope Studies in Plants - Development and Validation of a Novel Geochemical Tool and its Application to Organic Samples

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Book Series: Karlsruher mineralogische und geochemische Hefte : Schriftenreihe des Instituts für Angewandte Geowissenschaften ISSN: 16182677 ISBN: 9783731505945 Year: Volume: 42 Pages: XXV, 223 p. DOI: 10.5445/KSP/1000060292 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Ethnology
Added to DOAB on : 2019-07-30 20:02:00
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Abstract

Selenium (Se), being an essential nutrient and a toxin, enters the food chain mainly via plants. Selenium isotope signatures were proved to be an excellent redox tracer, making it a promising tool for the exploration of the Se cycle in plants. The analytical method is sensitive on organic samples and requires particular preparation methods, which were developed and validated in this study. Plant cultivation setups revealed the applicability of these methods to trace plant internal processes.

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