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Samples analyzed for acid-volatile sulfides (AVS) were collected on McLane pumps suspended from a trace metal wire (Hytrel-jacketed Vectran). Pumps filtered for four hours, flowing first over a 51-\u00b5m polyester pre-filter, then over paired 0.8-\u00b5m pore-size, 142-mm Supor polyethersulfone filters. A small portion of the top Supor filter, representing ~2% of the filter area (0.8-51 \u00b5m size-fraction material), was sub-sectioned into polyethylene vials and frozen at -85\u02daC until shipboard AVS analysis, described below. Filter blanks were held within identical filter housings and submerged on one of the deeper pumps on each cast, but were not actively filtered through. Blanks were handled identically to samples during processing, which was conducted in a HEPA-filtered environment using trace metal procedures.<\/p>\n
Particulate elemental samples were collected using McLane in situ pumps (P. Lam, UCSC) with splits (section) from a 0.8 \u00b5m Supor filter processed immediately in a N2<\/sub>-purged glove bag after collection and pump recovery; filter splits were placed and sealed in Tedlar bags and stored at -80\u00b0C until analysis. Particulate elemental selenium concentrations were determined using a sulfite leach following Velinsky and Cutter (1990) and analyzed like selenite+selenate following Cutter (1978).\u00a0 Precision was ca. 10% RSD (n=3).\u00a0<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Particulate Acid-Volatile Sulfide (pAVS) and elemental Selenium (pSe) depth profiles from McLane pump","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":" Data for the concentrations of\u00a0Particulate Acid-Volatile Sulfide (pAVS)\u00a0(0.8 mm) in depth profiles from in situ McLane pumps at GEOTRACES EPZT Stations 1-5, 7,\u00a09, 11, 13, 17, 18, 20, 21, and 23.<\/p>\n DMO notes:<\/strong><\/p>\n Samples analyzed in triplicate and means computed. Standard additions of selenite were used for daily calibration on a representative sample and its slope applied to subsequent samples.<\/p>\n Determinations of acid-volatile sulfide (AVS) were made on-board ship and used the method of Cutter and Oatts (Cutter and Oatts, 1987) that includes acidification, gas stripping and cryogenic trapping\/preconcentration of the generated hydrogen sulfide. In this case, the filter slice was placed in a glass stripping vessel, 10 mL of deionized water added, and the stripper purged with He. The cryogenic trap was then immersed in liquid nitrogen, 10mL of 1M HCl added through a septum in the stripping vessel and the evolved and trapped hydrogen sulfide was then quantified using the gas chromatography\/flame photometric detection method of Radford-Knoery and Cutter (Radford-Knoery and Cutter, 1993). The system was calibrated with hydrogen sulfide from a permeation tube (calibrated diffusion rate) and assuming a filtration volume of at least 5L (median sample volume: 7.9L), the detection limit was 0.2 pmol\/L. It should be noted that AVS determined by this method includes monosulfides of iron, zinc, and nickel, but not those with copper or mercury, or mixed oxidation state sulfides such as greigite or pyrite (Cutter and Oatts, 1987; Radford-Knoery and Cutter, 1993).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"646143","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"GP16 Elemental selenium and particulate Acid-Volatile Sulfide"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2016-05-19T16:17:52-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2016-05-19T16:17:52-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:646143","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/646143"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier646143"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R\/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R\/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent646143"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage646143"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Cutter, G. (2020) Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R\/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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