Simultaneous determination of dissolved organic carbon and total dissolved nitrogen in seawater by high temperature catalytic oxidation: conditions for precise shipboard measurements

Appropriate conditions have been achieve d for the accurate, rapid, and highly precise shipboard simultaneous determination of dissolved organic carbon and total dissolved nitrogen in seawater by high tem perature catalytic oxidation. A nitrogen-specific Antek 705D chemiluminescence detector and a CO 2-specific LiCor Li6252 IRGA have been coupled inseries with a Shimadzu TOC-5000 organic carbon analy ser. Precision of both sim ultaneous measurements is 1.5%, i.e., ±1 μmol C l and ± 0.3 μmol N l , respectively. Quality of analysis is not compromised by vibrations associated with ocean going research vessels.