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Thursday, October 8, 2020 | History

2 edition of Characteristics of photochemical production of carbon monoxide in seawater found in the catalog.

Characteristics of photochemical production of carbon monoxide in seawater

George Dean Redden

Characteristics of photochemical production of carbon monoxide in seawater

by George Dean Redden

  • 290 Want to read
  • 27 Currently reading

Published .
Written in English

    Subjects:
  • Carbon monoxide.,
  • Photochemistry.

  • Edition Notes

    Statementby George Dean Redden.
    The Physical Object
    Pagination[10], 108 leaves, bound :
    Number of Pages108
    ID Numbers
    Open LibraryOL15519210M

    Seawater - Seawater - Dissolved organic substances: Processes involving dissolved and particulate organic carbon are of central importance in shaping the chemical character of seawater. Marine organic carbon principally originates in the uppermost metres of the oceans where dissolved inorganic carbon is photosynthetically converted to organic materials. Oxidation of Carbon Monoxide. Like the methane, the oxidation cycle of carbon monoxide depends on the level of NO x. In high NO x regions the oxidation sequence is (3) (4) (5) Again, the transformation of NO into NO 2 regenerates a mole of OH radicals for each mole consumed in the CO oxidation reaction, and there is no net loss of oxidants.

    As noted in Chapter 1, ozone is formed by chemical reactions involving volatile organic compounds (VOCs) and carbon monoxide (CO) in the presence of nitrogen oxides (NO x) and might expect, therefore, that the severity of ozone pollution in a given region can be reduced by lowering the emissions of VOCs, CO, NO x, or any combination thereof. Decomposition and Transformation of Organic Matter --Photochemical Degradation of Dissolved Organic Carbon to Carbon Monoxide in Coastal Seawater --The Occurrence of Organic Peroxides in Seawater --"Picopellets" Produced by Phagotrophic Nanoflagellates: Role in the Material Cycling within Marine Environments --Feeding of Carnivorous Zooplankton.

    Carbon monoxide (CO) is one of the most important chemical reactants in the troposphere. It influences the fate of methane and ozone by removing the major atmospheric oxidizing agent, hydroxyl radical ().The background CO mixing ratios range from about 50 to ppb and vary considerably over time and space ().Fossil fuel use, biomass burning, and oxidation of atmospheric hydrocarbons (methane. Green Book Carbon Monoxide () Area Information. This section provides detailed information about nonattainment area designations for the Carbon Monoxide () National Ambient Air Quality Standards (NAAQS). Original areas were designated Novem


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Characteristics of photochemical production of carbon monoxide in seawater by George Dean Redden Download PDF EPUB FB2

Carbon monoxide production in seawater was mainly due to photooxidation of dissolved organic matter. Photobiological and microbial CO production processes were of minor importance.

Carbon monoxide destruction was due to a light‐independent microbial by: CHARACTERISTICS OF PHOTOCHEMICAL PRODUCTION OF CARBON MONOXIDE IN SEAWATER I. INTRODUCTION Dissolved carbon monoxide (GO) exhibits a dynamic distribution pattern within the marine euphotic zone which actively reflects the relative expression of.

Characteristics of photochemical production of carbon monoxide in seawater Public Deposited. Analytics × Add Cited by: Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).

Carbon monoxide (CO) photoproduction from particulate and chromophoric dissolved organic matter (CDOM) was determined in seawater from open‐ocean and coastal areas. In confirmatory tests, poisoned or non‐poisoned filtered and unfiltered blue‐water samples, were exposed to by: The photochemical production of carbon dioxide (CO2) and carbon monoxide (CO), derived from marine colored dissolved organic matter (CDOM), is considered a significant oceanic loss process for the.

Carbon monoxide concentrations were measured over an 8-day period (March ) in freshly fallen snow samples collected at Mount Sonnblick (Austria). Diurnal changes were systematically observed in the snow, with higher CO during daytime, indicating that light-dependent CO production processes are active in surface snow layers.

Mean daytime CO concentrations in snow varied significantly from. Evidence for significant photochemical production of carbon monoxide by particles in coastal and oligotrophic marine waters Huixiang Xie1 and Oliver C. Zafiriou2 Received 25 September ; revised 6 November ; accepted 12 November ; published 9 December   Mopper et al.

() reported that carbon monoxide was by far the most rapidly produced carbon photoproduct they were able to measure in seawater. However, Miller and Zepp () found that dissolved inorganic carbon, DIC (measured as the sum of CO 2, HCO 3 −, and CO 3 −2) was produced from CDOM about 20 times as fast as CO in the near coastal water of the Mississippi.

Carbon monoxide accelerates the reaction as measured by nitric oxide oxidation or ozone formation. This finding has relevance to photochemical smog.

Quantum yield for the photochemical production of dissolved inorganic carbon in seawater. Marine Chemistry76 (4), DOI: /S(01) 1. Introduction. Carbon monoxide (CO) plays two key roles in the atmosphere: 1) it impacts on climate forcing by competing with the methane in the reaction with the hydroxyl radical (Daniel and Solomon, ), the main atmospheric oxidant, and 2) it is involved in the production of ozone (Logan et al., ), which in turn leads to the photochemical smog, reducing atmospheric visibility.

Diurnal variations in the CO column burden were analyzed for daily oxidation and production rates of CO in water. Carbon monoxide in water was suggested to be rapidly oxidized by high microbial activities, showing the turnover times of 2–3 h in the Seto Inland Sea and 2 h at Sugashima.

Carbon monoxide (CO) is a colorless, odorless, and tasteless flammable gas that is slightly less dense than is toxic to animals that use hemoglobin as an oxygen carrier (both invertebrate and vertebrate) when encountered in concentrations above about 35 ppm, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions.

A new technique was used to measure the Bunsen solubility coefficients of CO and H 2 in deionized water and artificial sea‐water in the temperature range from 0° to 30 °C. The partial pressure of the respective gas was less than 2 × 10 −5 atmospheres.

Within 10% the results compare rather well with solubility data from the literature, which were obtained from measurements applying pure. Full-spectrum, ultraviolet (UV), and visible broadband apparent quantum yields (AQYs) for carbon monoxide (CO) photoproduction from chromophoric dissolved organic matter (CDOM) and particulate organic matter (POM) were determined in the Delaware Estuary in two hydrologically contrasting seasons in an unusually low flow in August and a storm-driven high flow in November.

Average AQYs for. Carbon monoxide reacts with water vapour at high temperatures, forming carbon dioxide and hydrogen; this process has been used as a source of hydrogen for combination with nitrogen in the synthesis of caustic alkalies, carbon monoxide forms alkali formates, which can be converted into either formic acid or alkali oxalates for the production of oxalic acid.

The sources of the carbon monoxide budget in the ocean is primarily from photochemical sources (42%), microbial sinks (27%) and microbial and gas exchange (32%) (Zafiriou et al., ). [2] The distribution of carbon monoxide (CO) in the stratosphere and mesosphere has long been used to infer dynamical processes and diagnose trace gas transport [Hays and Olivero, ; Allen et al., ].

This utility arises because the photochemical lifetime of CO is expected to be at least as long as the time scale for many of the dynamical. Carbon monoxide, ethylene, and propylene were produced in illuminated, cell-free distilled water or natural seawater systems to which dissolved organic matter produced by phytoplankton had been added.

Methane and the higher saturated gaseous hydrocarbons were not produced. In the dark, little or no carbon monoxide and no hydrocarbons were produced in the distilled water systems; only carbon.

The ocean is a significant sink for anthropogenic carbon dioxide, taking up about a third of the emissions arising from fossil-fuel use and tropical deforestation.

Increases in the atmospheric.Photochemical production rate of dissolved inorganic carbon ranged from to μ M hr −1, with a daily removal of ∼% of the standing stock of dissolved organic carbon (DOC).

The photomineralization rate was negatively correlated with chlorophyll a concentration, suggesting that plankton‐derived DOC was less photoreactive to.Carbon monoxide (CO) was rapidly formed when rainwater samples were exposed to sunlight or light from a solar simulator.

The initial photoformation rate of CO for rainwater samples collected in Miami, FL ranged from 22 nM/h to nM/h at summer clear‐day‐noon time.

The initial CO formation rate was also strongly correlated with the concentrations of dissolved organic carbon in rainwaters.