Two Hiden HPR-40 DSA Membrane Inlet Mass Spectrometer systems have been located on a ship in the West Antarctic Peninsula region to examine the seasonal cycle of biologically produced gases in surface waters.
The systems were used to detect and analyse low level concentrations of DMS in British Columbian water (Dimethylsulphide, a trace substance implicated in global climate change and regulation). The first system was being used with a membrane inlet to continuously sample seawater delivered from an in situ pump. The second instrument was used with a home made capillary inlet to measure concentrations of isotopically labelled sulphur species in tracer experiments looking at production and consumption of dimethylsulfide.
The HPR-40 systems were configured with a triple filter QMS provides detection levels into the parts per trillion (ppt) range corresponding to dilute DMS levels of ≤1nmol/L
Lizzy Asher, a PhD Student at the University of British Columbia who works with Philippe Tortell, has a blog detailing her activities. Click here to read Lizzy’s Blog.
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[Ref: Influence of regional climate forcing on surface water pCO2, DO2 /Ar and dimethylsulfide (DMS) along the southern British Columbia coast. PD Tortell, A Merzouk, D Ianson, R Pawlowicz and D Yelland 2012 Continental Shelf Research 47 119–132]