Macquarie Island soil chemistry data

Soil cores were collected from numerous locations across the Macquarie Island Isthmus. Soil samples were collected in clean glass jars with Teflon septa in the lid and stored at 4 deg C until analysed. Samples were solvent extracted twice with n-hexane using an Accelerated Solvent Extractor [ASE300] (preheat 5 minutes, heat 5 minutes to 70°C, static 5 minutes, flush 70% volume, purge 300 seconds, 1500 Psi, 3 cycles). Extracts were using gas chromatography-mass spectrometry (GC-MS) using an Agilent 7890A GC-MS operating in one dimension, coupled to a Pegasus time-of-flight-mass spectrometer (GCxGC-ToFMS).Column labelsSite name    Location identifier codeSite description    Description of sampling site locationSeason collected    Summer season during which samples were collectedLatitude    Decimal degreesLongitude    Decimal degreesDepth (m)    Sampling Depth – depth below ground from which sample was collected (m)C10-37 n-Alkanes (ug/g)    Concentration of Alkanes (ug) with carbon chain lengths 10-37 per gram (g) of soil. nd = not detectedC10-C22 n-alkanes (ug/g)    Concentration of Alkanes (ug) with carbon chain lengths 10-22 per gram (g) of soil. nd = not detectedC23-C37 n-alkanes (ug/g)    Concentration of Alkanes (ug) with carbon chain lengths 23-37 per gram (g) of soil. nd = not detectedC12-C22 n-alkanes (ug/g)    Concentration of Alkanes (ug) with carbon chain lengths 12-22 per gram (g) of soil. nd = not detectedC23-C34 n-alkanes (ug/g)    Concentration of Alkanes (ug) with carbon chain lengths 23-34 per gram (g) of soil. nd = not detected