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OAS accession Detail for 0278150
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| accessions_id: | 0278150 | archive |
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| Title: | Mercury and methylmercury concentrations in aerosols from the US GEOTRACES Arctic cruise (HLY1502, GN01) from August to October 2015 (NCEI Accession 0278150) |
| Abstract: | This dataset contains chemical data collected on USCGC Healy during cruise HLY1502 in the Arctic Ocean, Bering Sea, Chukchi Sea, and East Siberian Sea from 2015-08-10 to 2019-09-29. These data include metal concentration in atmosphere. The instruments used to collect these data include Aerosol Sampler, Automated Mercury Analysis System, and Cold Vapor Atomic Fluorescence Spectrophotometer. These data were collected by Robert Mason of University of Connecticut as part of the "Collaborative Research: GEOTRACES Arctic Section: Determination of atmospheric wet and dry deposition and air-sea exchange of mercury species from coastal and offshore waters (GEOTRACES Arctic Atmos Hg)" and "U.S. Arctic GEOTRACES Study (U.S. GEOTRACES Arctic)" projects and "U.S. GEOTRACES (U.S. GEOTRACES)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-02-19. The following is the text of the dataset description provided by BCO-DMO: Mercury and methylmercury concentrations in aerosols Dataset Description: The data include measurements of mercury and methylmercury concentrations in aerosols from the GEOTRACES Arctic Ocean cruise in 2015 (HLY1502, GN01). |
| Date received: | 20210219 |
| Start date: | 20150810 |
| End date: | 20190929 |
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| West boundary: | 104.19 |
| East boundary: | -97.848 |
| North boundary: | 89.945 |
| South boundary: | 56.074 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Methodology: Details of the methods for the cruise are given in DiMento et al. (2019). Details of the overall method and approach for dissolved gaseous mercury and atmospheric mercury methods are given in Andersson et al. (2008), Mason et al. (2017), Soerensen et al. (2014), and Soerensen et al. (2013). Analytical methods are detailed in DiMento et al. (2019) with additional information in the papers listed above and in Munson et al. (2014), Morton et al. (2013), and Gichuki & Mason (2014). See "Related Publications" below for complete citations. Sampling Procedures: Fourteen bulk aerosol deployments were made over periods of three to five days using high-volume aerosol samplers following methods in Morton et al. (2013). During each deployment, aerosol samples were collected in triplicate on pre-combusted glass-fiber (GFF) or quartz fiber (QMA) filters. Unused filters were set aside for blank analysis. Sampling duration lasted an average of 31.0 h (11.0 to 80.0 h) with an average volume filtered of 172.5 m3 (60.6 to 451.9 m3). Aerosol filters were stored in acid cleaned polystyrene petri dishes. All samples were kept frozen at -20 degrees C in the dark, and were transported back to the University of Connecticut for analysis. Methylmercury concentrations were determined following the ascorbic acid-assisted direct ethylation method (Munson et al., 2014) using a Tekran 2700 instrument and autosampler to automate the purging, trapping, and detection via cold vapor atomic fluorescence spectroscopy (CVAFS). Samples were thawed then acidified to 1% (v/v) H2SO4 and left to digest overnight before neutralizing with 8N potassium hydroxide (KOH), buffering with 4M acetate, adding 2.5% (w/v) ascorbic acid and finally 1% (w/v) sodium tetraethyl borate (NaTEB) to ethylate the methylmercury. Total mercury concentrations were determined by dual gold-amalgamation CVAFS utilizing a Tekran 2600 instrument in accordance with U.S. EPA Method 1631. Briefly, waters were digested with bromine monochloride (BrCl) followed by a pre-reduction step with hydroxylamine hydrochloride (NH₂OH·HCl). Inorganic Hg(II) was then reduced to Hg⁰ using stannous chloride (SnCl₂) prior to automated analysis on the Tekran. Aerosol filters were digested in acid-cleaned 15-mL centrifuge tubes with 10 mL of 4.57 M trace metal grade HNO3, placed in a covered 60 degrees C water bath for 12 hours (Hammerschmidt and Fitzgerald, 2006). A subsample of this digest was taken for CH3Hg analysis, and the remainder was further digested with BrCl overnight at room temperature. |
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| Metadata version: | 3 |
| Keydate: | 2023-05-13 04:41:34+00 |
| Editdate: | 2024-05-28 22:07:00+00 |