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- W197682968 endingPage "90" @default.
- W197682968 startingPage "59" @default.
- W197682968 abstract "Oceans are the largest reservoirs of reactive organic carbon on the Earth. Most (97%) of the organic carbon in seawater resides in the operationally defined dissolved phase. The separation of the particulate and dissolved phases is most commonly accomplished by the passage of water samples through filters with pore sizes in the range 0.2–1.0 μm. During the past decade, it has become increasingly common to avoid the filtration of open ocean water samples for the separation of the particulate and dissolved phases. Filtration is often omitted because particulate organic carbon (POC) is a small fraction of the total organic carbon and the extra handling and processing of water samples during filtration aboard ship can lead to contamination. Concentrations of organic carbon, nitrogen, and phosphorus in unfiltered water samples are referred to as total organic concentrations (TOC, TON, and TOP respectively). Relatively small volumes (milliliters) of seawater are analyzed for these measurements and larger particles are not represented in these samples. Thus, the term “total” is somewhat of a misnomer for these analyses. In this chapter the data gathered on the concentrations and chemical composition of marine DOM includes some samples that were not filtered prior to the analysis. These samples come from the open ocean and the contribution of particulate organic matter (POM) to the reported data is considered to be minimal. In some cases, data for both filtered and unfiltered samples were available and the differences among these samples were often within the error of the measurement." @default.
- W197682968 created "2016-06-24" @default.
- W197682968 creator A5085490925 @default.
- W197682968 date "2002-01-01" @default.
- W197682968 modified "2023-10-17" @default.
- W197682968 title "Chemical Composition and Reactivity" @default.
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