Abstract
An apparatus with a pyrolysis unit, gas chromatograph and quadrupole mass spectrometer was assembled for the simultaneous determination of total organic carbon (TOC) and total nitrogen (TN) in waters. The mass numbers used for the determination of TOC and TN were m/e 44 ( CO 2 +) and m/e 30 (NO +), respectively. The short-term stability (relative standard deviation) was 3.3% for TOC, and 5.0% for TN. The detection limits were 0.076 μg ml −1 for TOC and 1.3 μg ml −1 for TN. TOC and TN in water samples were determined by this method, and the results agreed well with those obtained by a combustion-infrared method for TOC and a combustion-coulometric method for TN.
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