Macquarie Island soil chemistry data

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 labels Site name Location identifier code Site description Description of sampling site location Season collected Summer season during which samples were collected Latitude Decimal degrees Longitude Decimal degrees Depth (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 detected C10-C22 n-alkanes (ug/g) Concentration of Alkanes (ug) with carbon chain lengths 10-22 per gram (g) of soil. nd = not detected C23-C37 n-alkanes (ug/g) Concentration of Alkanes (ug) with carbon chain lengths 23-37 per gram (g) of soil. nd = not detected C12-C22 n-alkanes (ug/g) Concentration of Alkanes (ug) with carbon chain lengths 12-22 per gram (g) of soil. nd = not detected C23-C34 n-alkanes (ug/g) Concentration of Alkanes (ug) with carbon chain lengths 23-34 per gram (g) of soil. nd = not detected