Version: 3 January 2013 PI: Cutter KN199-04/05 Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity Please note that 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 US GEOTRACES project page.