http://lod.bco-dmo.org/id/dataset/840578
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2021-02-11
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Coastal phytoplankton and mercury dynamics in watersheds along the U.S. East Coast from New Jersey to Maine assessed using particulate and dissolved samples collected in 2015 and 2016
2021-02-17
publication
2021-02-17
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2021-02-22
publication
https://doi.org/10.26008/1912/bco-dmo.840578.1
Robert P. Mason
University of Connecticut
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Mason, R. (2021) Coastal phytoplankton and mercury dynamics in watersheds along the U.S. East Coast from New Jersey to Maine assessed using particulate and dissolved samples collected in 2015 and 2016. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-02-17 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.840578.1 [access date]
Dataset Description: <p>The data in each year are grouped by Location, Filter size, and measured parameters for each size fraction, as well as the measured dissolved parameters:</p>
<p><strong><u>Location</u></strong>: state, site name and sub-location (in many instances these are sites with high (HOC) and low (LOC) organic carbon sediments), sampling month and sampling time in terms of tide (HT = high tide, LT = low tide, FL = falling and RS = rising tide; if more than one sample at a tide was collected, this is indicated, e.g. HT1, HT2), latitude and longitude</p>
<p><strong><u>Filter size</u></strong>: Filtering protocols were not exactly identical between years. In 2015, samples were sequentially filtered so particulate samples are &gt;20 µm (large fraction) and 0.2-20 µm (small fraction). In 2016, water was sampled through filters independently so samples are &gt;2 µm (bulk) and &lt;20 µm (small&nbsp;fraction).&nbsp;For each filter, the following parameters were measured and are recorded: total suspended solids (TSS, mg/L), chlorophyll a (Chl a, µg/L) and phaeopigment (Pha, µg/L), particulate total Hg (part. HgT, pmol/g) and particulate methylmercury (part. MeHg, pmol/g).</p>
<p><strong><u>Dissolved parameters</u></strong>: For each location, a filtered sample was analyzed for: dissolved total mercury (diss. HgT, pM), dissolved methylmercury (diss. MeHg, pM), and dissolved organic carbon (DOC, µM). Salinity and temperature (degrees C) were also recorded for each sample.</p> Methods and Sampling: <p>Coastal phytoplankton measurements were taken from 22 sites wtihin watersheds along the U.S. East Coast, from New Jersey to Maine, in 2015 and 2016.&nbsp; Samples were collected from shore or small boat by hand using clean sampling techniques and processed within 12 hours of collection.&nbsp;Salinity and temperature were also measured,&nbsp;using a hand-held YSI sonde.</p>
<p>Water was filtered using either quartz filters combusted at 550&nbsp;degrees C and 0.2 µm polycarbonate filters cleaned with 2% hydrochloric acid (2016) or sequentially filtered using 20 µm nylon filters and 0.2 µm polycarbonate filters cleaned with 2% hydrochloric acid (2015). The sequential filters in 2015 can be summed to calculate a bulk sample.&nbsp; The filters were stored frozen until analysis for particulate HgT and MeHg, and ancillary parameters.</p>
<p><strong>Dissolved samples </strong>were collected after the filter (filtrate) into acid cleaned <em>iChem</em> bottles and preserved with 0.2% HCl if intended for HgT or combined MeHg and HgT analyses. Samples for only dissolved MeHg were preserved with 0.5% H<sub>2</sub>SO<sub>4</sub>.&nbsp; DOC samples were collected from the particulate Hg filtrate into muffled amber vials and nutrient&nbsp;samples into acid-cleaned plastic centrifuge tubes; both were preserved by freezing.&nbsp; Samples were collected at various tidal stages (as explained above in Description section).</p>
<p><strong>Particulate and dissolved MeHg samples</strong> were analyzed on a Tekran 2700 Automated Methylmercury Analysis System following standard techniques (Hammerschmidt and Fitzgerald, 2006; Gosnell et al., 2017; Munson et al., 2014; Seelen et al., 2021). Briefly, particulate samples were digested in 4.5N nitric acid overnight, neutralized with potassium hydroxide and acetate buffer, and ethylated using sodium tetraethylborate before separation by gas chromatography and cold vapor atomic fluorescence detection with calibration against a standard curve (Alfa Aesar CAS: 115–09–3, LOT: 1791821 spike recovery= 103±14%). Dissolved MeHg samples were analyzed similarly except the seawater was digested overnight in 1% H<sub>2</sub>SO<sub>4</sub>, and 2.5% L-ascorbic acid was added prior to ethylation (Munson et al., 2014) (Alfa Aesar CAS: 115–09–3, LOT: 1791821 spike recovery= 86±34%). The samples were not corrected for spike recovery. The methods are a modified version of EPA method 1630.</p>
<p><strong>HgT </strong>was analyzed on a Tekran 2600 by cold vapor atomic fluorescence spectrometry following EPA method 1631, refined by Hammerschmidt and Fitzgerald (2006). The particulate HgT (pHgT) sample filters were digested in 4.5N nitric acid with bromine monochloride (BrCl) for 16 hrs, followed by hydroxylamine hydrochloride and stannous chloride additions before analysis. Calibration was against a standard curve and the results were spike corrected (J.T.Baker CAS: 7732–16–5, Batch No: 0000127949 spike recovery= 121±2%). For some samples, the same filter was used for both pMeHg and pHgT, in which case the BrCl addition was made after the MeHg analysis was complete. Dissolved HgT (dHgT) analysis was similar to the particulate analysis, except only BrCl was added &gt;16 hr for digestion prior to reduction for analysis. The samples were blank and spike corrected (J.T.Baker CAS: 7732–16–5, Batch No: 0000127949 spike recovery= 76±5%).</p>
<p><strong>Total suspended solids (TSS)</strong> was determined using the dried filters, as they were pre-weighed prior to use. Chlorophyll a (chl a) and phaeopigment (pha) concentrations were quantified from wet filters using fluorescence techniques after 90% acetone extraction and acidification for pha. DOC was analyzed on a Shimadzu TOC/TN analyzer. Duplicate average RSD = 6.6% (pigments) and 2.8% (DOC); Seelen et al., 2021; Taylor et al., 2019).</p>
<p>Details of <strong>filtering and other analytical methods</strong> can be found in Seelen et al. (2021) and other publications covering these studies (Taylor et al., 2019; Seelen et al., 2018). Blanks and replicate samples were included in the sampling and analysis, and spike recoveries and other QA/QC included in the analysis (see <a href="https://datadocs.bco-dmo.org/docs/302/Phytoplankton_MeHg/data_docs/840578/Table1_Mason_CoastalPhyto.pdf">Table1</a>&nbsp;in Supplemental Files below).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1634048 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1634048
completed
Robert P. Mason
University of Connecticut
860-405-9129
Department of Marine Sciences
Groton
CT
06340
USA
Robert.mason@uconn.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
State
Watershed
Site_Location
Site
Subsite
Latitude
Longitude
Year
Month
Tide
Part_fraction_small
TSS_small
Chl_a_small
Pha_small
Part_MeHg_small
Part_HgT_small
Part_fraction_large
TSS_large
Chl_a_large
Pha_large
Part_MeHg_large
Part_HgT_large
Diss_HgT
Diss_MeHg
DOC
Salinity
Temp
Tekran 2700 Automated Methylmercury Analysis Systems
Tekran 2600 cold vapor atomic fluorescence spectrometer
YSI hand-held sonde
Shimadzu TOC/TN analyzer
theme
None, User defined
region
site description
site
latitude
longitude
year
month of year
tide
sample fraction (includes size fractions)
suspended particulate matter concentration
chlorophyll a
total phaeopigment
MMHg
total mercury
dissolved organic Carbon
bottle salinity
temperature of sample or a generic measurement (not in-situ water temp)
featureType
BCO-DMO Standard Parameters
Automated Mercury Analysis System
Cold Vapor Atomic Fluorescence Spectrophotometer
Salinity Sensor
Total Organic Carbon Analyzer
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Collaborative Research: Transformations and mercury isotopic fractionation of methylmercury by marine phytoplankton
https://osprey.bco-dmo.org/project/810499
Collaborative Research: Transformations and mercury isotopic fractionation of methylmercury by marine phytoplankton
<p><em>NSF Award Abstract:</em><br />
The accumulation of mercury (Hg) in seafood is a public health concern. The presence of Hg in seafood depends to a large degree on the air-sea exchange of Hg, with atmospheric deposition leading to accumulation of Hg in the ocean. The pathways to seafood start with the uptake of Hg by phytoplankton from seawater where is has always been assumed to accumulate to be eaten by grazers and passed on to larger organisms. This project challenges this assumption with preliminary data that suggests certain phytoplankton species can transform Hg to volatile forms (mercury vapor & dimethylmercury) that are lost to the atmosphere, a processes that removes Hg from the ocean rather than simply concentrating it into the ecosystem and seafood. This process, which has not been studied before, could dramatically alter our view of the Hg cycle in the ocean. The researchers funded by this project will look for the specific phytoplankton species that are capable of volatilizing Hg and quantify the rates at which they do so. They will also examine the suspected role of associated sulfur and selenium compounds in the process, as well as quantifying the changes in the Hg isotopic values for potential use as chemical tracers of the source of Hg in the ecosystem and food supply. These results should allow oceanographers to better quantify and refine our knowledge of Hg cycling in the ocean. The project will support participation of graduate students, a postdoctoral scientist, and incorporation of new information directly into courses taught by the researchers. Funding will also support continuing activities by the participants in activities that disseminate information on mercury and its effect on public and environmental health.</p>
<p>Biogeochemical cycling of mercury (Hg) in the ocean may be more complex than previously assumed. New evidence has challenged the idea that methylmercury (MeHg) merely accumulates in phytoplankton and undergoes little to no transformation before being passed into the food web. This project aims to more fully elucidate the mechanisms behind the intracellular transformation of MeHg to volatile Hg and dimethylmercury (Me2Hg) that can be lost to the atmosphere, as well as to evaluate the range of algal taxa that can perform this transformation using directed culture work. Additionally, the PIs will investigate evidence that thiols, organic selenium (Se) compounds, and sulfides are required to facilitate these reactions within the phytoplankton, and specific pathways will be investigated and quantified through this research. Stable Hg isotopic data has been used to track Hg sources and pathways in marine systems and its fractionation during these MeHg transformations will also be quantified for future field study of marine Hg. The investigators hypothesize that coccolithophorids and other haptophytes capable of these intracellular reactions may account for a significant portion of the production of volatile Hg in the ocean. If this turns out to be the case, understanding and quantifying these volatilization processes may significantly alter our current understanding of the overall biogeochemical cycling of Hg in the ocean.</p>
Phytoplankton MeHg
largerWorkCitation
project
eng; USA
oceans
-75.475
-68.791
38.928
44.763
2015-08-01
2016-07-01
Antarctic Peninsula
0
BCO-DMO catalogue of parameters from Coastal phytoplankton and mercury dynamics in watersheds along the U.S. East Coast from New Jersey to Maine assessed using particulate and dissolved samples collected in 2015 and 2016
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/841029.rdf
Name: State
Units: unitless
Description: <p>State location of sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/841030.rdf
Name: Watershed
Units: unitless
Description: <p>Watershed name</p>
http://lod.bco-dmo.org/id/dataset-parameter/841031.rdf
Name: Site_Location
Units: unitless
Description: <p>Site location with the watershed</p>
http://lod.bco-dmo.org/id/dataset-parameter/841032.rdf
Name: Site
Units: unitless
Description: <p>Site name</p>
http://lod.bco-dmo.org/id/dataset-parameter/841033.rdf
Name: Subsite
Units: unitless
Description: <p>Subsite indicating presence of high or low organic carbon sediments</p>
http://lod.bco-dmo.org/id/dataset-parameter/841034.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Latitude of sample site</p>
http://lod.bco-dmo.org/id/dataset-parameter/841035.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Longitude of sample site, west is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/841036.rdf
Name: Year
Units: unitless
Description: <p>Year of sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/841037.rdf
Name: Month
Units: unitless
Description: <p>Month of sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/841038.rdf
Name: Tide
Units: unitless
Description: <p>Tidal state during the sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/841039.rdf
Name: Part_fraction_small
Units: microns (µm)
Description: <p>Particulate fraction of filtered material (either 0.2-20 microns, or 0.45-20 microns)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841040.rdf
Name: TSS_small
Units: milligrams per Liter (mg/L)
Description: <p>Chlorophyll a (smaller fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841041.rdf
Name: Chl_a_small
Units: micrograms per Liter (µg/L)
Description: <p>Phaeopigment (smaller fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841042.rdf
Name: Pha_small
Units: micrograms per Liter (µg/L)
Description: <p>Total suspended solids (smaller fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841043.rdf
Name: Part_MeHg_small
Units: picomoles per gram (pmol/g)
Description: <p>Particulate methylmercury (smaller fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841044.rdf
Name: Part_HgT_small
Units: nanomoles per gram (nmol/g)
Description: <p>Particulate total mercury (smaller fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841045.rdf
Name: Part_fraction_large
Units: microns (µm)
Description: <p>Particulate fraction of filtered material (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841046.rdf
Name: TSS_large
Units: milligram per Liter (mg/L)
Description: <p>Total suspended solids (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841047.rdf
Name: Chl_a_large
Units: micrograms per Liter (µg/L)
Description: <p>Chlorophyll a (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841048.rdf
Name: Pha_large
Units: micrograms per Liter (µg/L)
Description: <p>Phaeopigment (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841049.rdf
Name: Part_MeHg_large
Units: picomoles per gram (pmol/g)
Description: <p>Particulate methylmercury (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841050.rdf
Name: Part_HgT_large
Units: nanomoles per gram (nmol/g)
Description: <p>Particulate total mercury (larger fraction)</p>
http://lod.bco-dmo.org/id/dataset-parameter/841051.rdf
Name: Diss_HgT
Units: picomoles (pM)
Description: <p>Dissolved methylmercury</p>
http://lod.bco-dmo.org/id/dataset-parameter/841052.rdf
Name: Diss_MeHg
Units: picomoles (pM)
Description: <p>Dissolved total mercury</p>
http://lod.bco-dmo.org/id/dataset-parameter/841053.rdf
Name: DOC
Units: micromoles (µM)
Description: <p>Dissolved Organic Carbon</p>
http://lod.bco-dmo.org/id/dataset-parameter/841054.rdf
Name: Salinity
Units: unitless
Description: <p>Salinity of water at sample site</p>
http://lod.bco-dmo.org/id/dataset-parameter/841055.rdf
Name: Temp
Units: degrees Celsius
Description: <p>Temperature of water at sample site</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
12541
https://darchive.mblwhoilibrary.org/bitstream/1912/26728/1/dataset-840578_coastal-phytoplankton__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.840578.1
download
onLine
dataset
<p>Coastal phytoplankton measurements were taken from 22 sites wtihin watersheds along the U.S. East Coast, from New Jersey to Maine, in 2015 and 2016.&nbsp; Samples were collected from shore or small boat by hand using clean sampling techniques and processed within 12 hours of collection.&nbsp;Salinity and temperature were also measured,&nbsp;using a hand-held YSI sonde.</p>
<p>Water was filtered using either quartz filters combusted at 550&nbsp;degrees C and 0.2 µm polycarbonate filters cleaned with 2% hydrochloric acid (2016) or sequentially filtered using 20 µm nylon filters and 0.2 µm polycarbonate filters cleaned with 2% hydrochloric acid (2015). The sequential filters in 2015 can be summed to calculate a bulk sample.&nbsp; The filters were stored frozen until analysis for particulate HgT and MeHg, and ancillary parameters.</p>
<p><strong>Dissolved samples </strong>were collected after the filter (filtrate) into acid cleaned <em>iChem</em> bottles and preserved with 0.2% HCl if intended for HgT or combined MeHg and HgT analyses. Samples for only dissolved MeHg were preserved with 0.5% H<sub>2</sub>SO<sub>4</sub>.&nbsp; DOC samples were collected from the particulate Hg filtrate into muffled amber vials and nutrient&nbsp;samples into acid-cleaned plastic centrifuge tubes; both were preserved by freezing.&nbsp; Samples were collected at various tidal stages (as explained above in Description section).</p>
<p><strong>Particulate and dissolved MeHg samples</strong> were analyzed on a Tekran 2700 Automated Methylmercury Analysis System following standard techniques (Hammerschmidt and Fitzgerald, 2006; Gosnell et al., 2017; Munson et al., 2014; Seelen et al., 2021). Briefly, particulate samples were digested in 4.5N nitric acid overnight, neutralized with potassium hydroxide and acetate buffer, and ethylated using sodium tetraethylborate before separation by gas chromatography and cold vapor atomic fluorescence detection with calibration against a standard curve (Alfa Aesar CAS: 115–09–3, LOT: 1791821 spike recovery= 103±14%). Dissolved MeHg samples were analyzed similarly except the seawater was digested overnight in 1% H<sub>2</sub>SO<sub>4</sub>, and 2.5% L-ascorbic acid was added prior to ethylation (Munson et al., 2014) (Alfa Aesar CAS: 115–09–3, LOT: 1791821 spike recovery= 86±34%). The samples were not corrected for spike recovery. The methods are a modified version of EPA method 1630.</p>
<p><strong>HgT </strong>was analyzed on a Tekran 2600 by cold vapor atomic fluorescence spectrometry following EPA method 1631, refined by Hammerschmidt and Fitzgerald (2006). The particulate HgT (pHgT) sample filters were digested in 4.5N nitric acid with bromine monochloride (BrCl) for 16 hrs, followed by hydroxylamine hydrochloride and stannous chloride additions before analysis. Calibration was against a standard curve and the results were spike corrected (J.T.Baker CAS: 7732–16–5, Batch No: 0000127949 spike recovery= 121±2%). For some samples, the same filter was used for both pMeHg and pHgT, in which case the BrCl addition was made after the MeHg analysis was complete. Dissolved HgT (dHgT) analysis was similar to the particulate analysis, except only BrCl was added &gt;16 hr for digestion prior to reduction for analysis. The samples were blank and spike corrected (J.T.Baker CAS: 7732–16–5, Batch No: 0000127949 spike recovery= 76±5%).</p>
<p><strong>Total suspended solids (TSS)</strong> was determined using the dried filters, as they were pre-weighed prior to use. Chlorophyll a (chl a) and phaeopigment (pha) concentrations were quantified from wet filters using fluorescence techniques after 90% acetone extraction and acidification for pha. DOC was analyzed on a Shimadzu TOC/TN analyzer. Duplicate average RSD = 6.6% (pigments) and 2.8% (DOC); Seelen et al., 2021; Taylor et al., 2019).</p>
<p>Details of <strong>filtering and other analytical methods</strong> can be found in Seelen et al. (2021) and other publications covering these studies (Taylor et al., 2019; Seelen et al., 2018). Blanks and replicate samples were included in the sampling and analysis, and spike recoveries and other QA/QC included in the analysis (see <a href="https://datadocs.bco-dmo.org/docs/302/Phytoplankton_MeHg/data_docs/840578/Table1_Mason_CoastalPhyto.pdf">Table1</a>&nbsp;in Supplemental Files below).</p>
Specified by the Principal Investigator(s)
<p>BCO-DMO processing:<br />
- Combined datasets from years 2015 and 2016<br />
- Joined watershed, site location, and subsite information to dataset<br />
- Added a conventional header with dataset name, PI names, version date<br />
- Adjusted parameter names to comply with database requirements<br />
- Units removed and added to Parameter Description metadata section<br />
- Missing data replaced with 'nd' (BCO-DMO's default missing data identifier)&nbsp;</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Tekran 2700 Automated Methylmercury Analysis Systems
Tekran 2700 Automated Methylmercury Analysis Systems
PI Supplied Instrument Name: Tekran 2700 Automated Methylmercury Analysis Systems PI Supplied Instrument Description:Particulate and dissolved MeHg samples analyzed on a Tekran 2700 Automated Methylmercury Analysis System (which incorporates gas chromatography and cold vapor atomic fluorescence detection)\ Instrument Name: Automated Mercury Analysis System Instrument Short Name: Instrument Description: Examples include Tekran Models 2600 and 2700
Tekran 2600 cold vapor atomic fluorescence spectrometer
Tekran 2600 cold vapor atomic fluorescence spectrometer
PI Supplied Instrument Name: Tekran 2600 cold vapor atomic fluorescence spectrometer PI Supplied Instrument Description:Tekran 2600 cold vapor atomic fluorescence spectrometry used to measure HgT Instrument Name: Cold Vapor Atomic Fluorescence Spectrophotometer Instrument Short Name:CVAFS Instrument Description: A Cold Vapor Atomic Fluorescent Spectrophotometer (CVAFS) is an instrument used for quantitative determination of volatile heavy metals, such as mercury. CVAFS make use of the characteristic of mercury that allows vapor measurement at room temperature. Mercury atoms in an inert carrier gas are excited by a collimated UV light source at a particular wavelength. As the atoms return to their non-excited state they re-radiate their absorbed energy at the same wavelength. The fluorescence may be detected using a photomultiplier tube or UV photodiode.
YSI hand-held sonde
YSI hand-held sonde
PI Supplied Instrument Name: YSI hand-held sonde PI Supplied Instrument Description:Salinity and temperature were measured using a hand-held YSI sonde. Instrument Name: Salinity Sensor Instrument Short Name:Salinity Sensor Instrument Description: Category of instrument that simultaneously measures electrical conductivity and temperature in the water column to provide temperature and salinity data. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/350/
Shimadzu TOC/TN analyzer
Shimadzu TOC/TN analyzer
PI Supplied Instrument Name: Shimadzu TOC/TN analyzer PI Supplied Instrument Description:Shimadzu TOC/TN analyzer used to measure DOC Instrument Name: Total Organic Carbon Analyzer Instrument Short Name:TOC analyzer Instrument Description: A unit that accurately determines the carbon concentrations of organic compounds typically by detecting and measuring its combustion product (CO2). See description document at: http://bcodata.whoi.edu/LaurentianGreatLakes_Chemistry/bs116.pdf Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/