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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
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Development of an in situ manganese analyzer using micro-diaphragm pumps and its application to time-series observations in a hydrothermal field at the Suiyo seamount

Kei Okamura, Hiroshi Hatanaka, Hideshi Kimoto, Masaaki Suzuki, Yoshiki Sohrin, Eiichiro Nakayama, Toshitaka Gamo, Jun-ichiro Ishibashi
Geochemical Journal, Vol. 38, No. 6, P. 635-642, 2004

ABSTRACT

A submersible analyzer (Geochemical Anomaly MOnitoring System, GAMOS-IV) powered by micro-diaphragm pumps has been developed for in situ monitoring of time-series changes in manganese concentrations. The analyzer determines dissolved manganese in a continuous manner using a H2O2-luminol chemiluminescence method. The analyzer operates with a sample and reagent flow rate of approximately 60 μl/min, with a detection range up to 10 μM manganese, and has a 98% response time of approximately 6 min. The GAMOS-IV was tested during test deployment at 1, 379 m in diffused hydrothermal fields at the Suiyo seamount. The ratio of manganese concentration to temperature (Mn/T) varied with different admixtures of source fluids.

KEYWORDS

in situ analyzer, manganese, chemiluminescence, time series, hydrothermal field

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