<div><p>Filtered (0.4 µm) water samples from the Geotraces surface tow-fish taken at discrete times into 500 mL Teflon FEP bottles, refrigerated, and analyzed within 24 hours of collection. Arsenic and antimony speciation determined using selective hydride generation, liquid nitrogen-cooled trapping, and then revolatilization and determination with gas chromatography/photoionization detection (Cutter et al., 1991; Cutter and Cutter, 2006). Calibration performed daily via the standard additions method, with a minimum of 4 additions of AsIII, AsV, MMAs, or DMAs depending on the analyses. The slope from the linear fit to these data was then applied to all samples for that day. Detection limits were 25 pmol/L for As(III) and As(III+V), and 50 pmol/L for MMAs and DMAs. Precision was better than 8% (relative standard deviation) for all As species. Alkaline phosphatase enzyme activity was measured using the fluorescence method of Ammerman (1993).</p></div>
Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity
<div><p>Data for the concentrations of the dissolved (<0.4 µm) arsenic species: total inorganic As (III+V), arsenite (AsIII), arsenate (AsV), monomethyl As, and dimethyl As; and the activity of the enzyme alkaline phosphatase (unfiltered) on the surface transect.</p>
<p>Modification history: Data were updated 3 January 2013</p>
<p>Please note that some US GEOTRACES data may not be final, pending intercalibration results and further analysis. If you are interested in following changes to US GEOTRACES NAT data, there is an RSS feed available via the BCO-DMO <a href="http://www.bco-dmo.org/project/2066">US GEOTRACES project page</a> (<a href="http://www.bco-dmo.org/project/2066;">http://www.bco-dmo.org/project/2066;</a> scroll down and expand the "Datasets" section).</p></div>
GT10 - As AP Surface Transects
<div><p>Samples analyzed in duplicate or triplicate and means computed.</p>
<p><strong>BCO-DMO Processing Notes</strong><br />
- Generated from original .xls file "GEOTRACES Knorr 199-4 and -5 As Sb AP.xls" contributed by Greg Cutter<br />
- cruise id converted to official UNOLS cruise id<br />
- Year,Month,Day combined into Date and reformatted as YYYYMMDD<br />
- Hour,Minute combined into Time and reformatted as HHMM<br />
- "nd" (no data) value inserted in blank cells<br />
- Parameter names modified to conform to BCO-DMO convention</p></div>
3520
GT10 - As AP Surface Transects
2011-08-08T13:18:28-04:00
2011-08-08T13:18:28-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:3520
Surface arsenic, antimony speciation, and alkaline phosphatase activity along with US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project)
Data for the concentrations of the dissolved (<0.4 µm) arsenic species: total inorganic As (III+V), arsenite (AsIII), arsenate (AsV), monomethyl As, and dimethyl As; and the activity of the enzyme alkaline phosphatase (unfiltered) on the surface transect.
false
Cutter, G. (2020) Surface arsenic, antimony speciation, and alkaline phosphatase activity along with US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2013-01-03 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.3520.2 [access date]
true
2
10.26008/1912/bco-dmo.3520.2
false
GEOTRACES
arsenic speciation
antimony speciation
alkaline phosphatase activity
2013-01-03
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3520
http://lod.bco-dmo.org/id/dataset/3520
2010-10-20 - 2010-11-24
2010-10-20
2010-10-20
---20
292
--10
2010
2010-11-24
2010-11-24
---24
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OSPREY
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<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON((-75.7881 16.9208, -16.0467 16.9208, -16.0467 16.9208, -16.0467 35.1603, -75.7881 35.1603, -75.7881 16.9208))
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SUBSET DATA
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MATLAB
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