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Journal of Automatic Chemistry
Volume 14 (1992), Issue 5, Pages 163-167

Determination of nutrients in seawater by segmented–flow analysis with higher analysis rate and reduced interference on ammonia

1Tokyo Kyuei, 6906-10 Tsurugamaru Shiba Kawaguchi, Saitama-ken, Japan
2Bran + Luebbe KK, Shouei Bldg, 22-8, 4-Chome, Sendagaya, Shibuya-ku, Tokyo 151, Japan
3Bran + Luebbe, PO Box 1360, Norderstedt W-2000, Germany

Copyright © 1992 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A microbore continuous-flow analyser was used to determine ammonia, nitrite, nitrate and phosphate in seawater. Ninety samples per hour were measured by optimizing the hydraulic conditions and using a cadmium coil for nitrate reduction. The analysis range was extended and the detection limit was reduced by using two analytical ranges with automatic range-changing. Interference from magnesium on ammonia was investigated and reduced by using a different complexing agent. The results correlated well with a Japanese reference method.