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Samples were collected by the U.S. GEOTRACES sampling team from 24 modified 12-L Teflon-coated GO-FLO samplers mounted on the GEOTRACES clean CTD rosette system (Cutter and Bruland 2012). The U.S. GEOTRACES sampling team filtered the samples through 0.2 um Supor Acropak filter cartridges (Pall) inside the U.S. GEOTRACES clean-air laboratory van. Filtered samples were stored in LDPE 0.5-L bottles. After transportation to the land-based lab, samples were acidified using trace metal grade nitric acid (HNO3). Samples were stored at room temperature for more than two months prior to analysis.\u00a0\u00a0\u00a0\u00a0<\/p>\n
Dissolved trace metal analysis:<\/strong><\/p>\n Acidified samples were determined for dissolved Fe, Mn, Cd,\u00a0 Cu, and Zn using Mg(OH)2 co-precipitation method coupled to isotope dilution and by means of a multiple-collector inductively coupled plasma mass spectrometer. The method is a modified version of Wu and Boyle (1997 and 1998).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Dissolved Fe, Mn, Cd, Cu and Zn from bottle samples","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":" This dataset contains dissolved concentrations of trace metals including iron (Fe), manganese (Mn), cadmium (Cd), copper (Cu), and zinc (Zn) from bottle samples. \u00a0The samples were collected during the U.S. GEOTRACES EPZT cruise TN303 aboard the R\/V Thomas G. Thompson between November and December of 2013. Also included in this dataset are latitude, longitude, depth, event number, station number, cast number, and\u00a0bottle number.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GP16 Dissolved Fe, Mn, Cd, Cu and Zn","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":" Data processing was carried out using Thermo Scientific software and also Microsoft Excel.\u00a0 \u00a0<\/p>\n BCO-DMO Data Manager Processing Notes:<\/strong> Additional GEOTRACES Processing:<\/strong> cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, \u00a0BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.<\/p>\n This added information will facilitate subsequent analysis and inter comparison of the datasets.<\/p>\n Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.<\/p>\n A standardized BCO-DMO method (called \"join\") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.<\/p>\n If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. 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\n* added a conventional header with dataset name, PI name, version date
\n* modified parameter names to conform with BCO-DMO naming conventions
\n* blank values replaced with no data value 'nd'
\n* removed data column \"Cruise\" containing value \"USGT_EPZT\" for all cells
\n* added SECT_ID \"EPZT\" and cruise_id \"TN303\"
\n* changed parameter names with _std to _SD to be consistent with other GEOTRACES datasets
\n* joined dataset as described below to add :
\nCASTNO,GEOTRC_EVENTNO,BTL_ISO_DATETIME_UTC,BTLNBR,BTLNBR_FLAG_W,ISO_DATETIME_UTC_START_EVENT,EVENT_LAT,EVENT_LON,STNNBR,CTDDEPTH,CTDPRS
\n* changed depth variable to PI_depth to distinguish between the master epzt\u00a0depth and the rounded depth originally in the dataset.
\n* new data version posted (2017-03-21) which replaces version\u00a02016-12-28. The only change is 5 replacements of \"nd \" to \"nd\" with space removed.<\/p>\n
\nAs was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:<\/p>\n