Instrument: Elemental Analyzer
Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.
The d15N of tow-collected, size-fractionated PON was determined by elemental analyzer-isotope ratio mass spectrometry (an Elementar Vario Isotope Cube online to an Elementar Isoprime visION), referencing to atmospheric N2 using USGS-40 and an in-house aminocaproic acid standard.