<div><p>Filtered (0.4 micromole) water samples from the Geotraces surface tow-fish taken at discrete times were placed 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).</p>
<p>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>Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity</p>
<p>Data for the concentrations of the dissolved (<0.4 µm) arsenic species: total inorganic As (III+V), arsenite (AsIII), As(V), monomethyl As, dimethyl As, and the activity of the enzyme alkaline phosphatase (unfiltered).</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>
GT11 - As AP Surface Transects
<div><p>Samples analyzed in duplicate or triplicate and means computed.</p></div>
3830
GT11 - As AP Surface Transects
2012-12-31T15:08:39-05:00
2012-12-31T15:08:39-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:3830
Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity from R/V Knorr cruise KN204-01 in the Subtropical North Atlantic Ocean in 2011 (U.S. GEOTRACES NAT project)
Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity. Data for the concentrations of the dissolved (<0.4 µm) arsenic species: total inorganic As (III+V), arsenite (AsIII), As(V), monomethyl As, dimethyl As, and the activity of the enzyme alkaline phosphatase (unfiltered).
false
Cutter, G. (2020) Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity from R/V Knorr cruise KN204-01 in the Subtropical North Atlantic Ocean in 2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2013-01-03 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.3830.1 [access date]
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