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An Integrated Microfluidic System for Manganese Anomaly Detection Based on Chemiluminescence: Description and Practical Use to Discover Hydrothermal Plumes Near the Okinawa Trough

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4 Author(s)
Christophe Provin ; Inst. of Ind. Sci., Univ. of Tokyo, Tokyo, Japan ; Tatsuhiro Fukuba ; Kei Okamura ; Teruo Fujii

Underwater hydrothermal vents draw a lot of interest as they are the shelter for unique ecosystems, besides being a possible new opportunity for ore mining. Manganese (Mn) is found at a high concentration in hydrothermal vents, which make it possible to use this metal ion as a tracer to detect and evaluate new hydrothermal sources. Here we present a miniaturized and integrated microfluidic system for the detection of Mn in deep-sea environment, called the integrated in situ analyzer for Mn2+ (IISA-Mn). The detection system is based on the chemiluminescence reaction of Mn contained in the seawater sample with a luminol-based reagent, which offers a high sensitivity. This system is composed of a microdevice for mixing and reaction, a pumping unit, several valving units, and a photomultiplier (PMT) detector. The system is able to detect Mn concentration above 280 nM in seawater, and gives a quite linear response until 500 nM. It is also proven to be able to work continuously during the 8 h of an actual remotely operated vehicle (ROV) dive. This system has led to the discovery of a previously unknown hydrothermal site in the Okinawa Trough.

Published in:

IEEE Journal of Oceanic Engineering  (Volume:38 ,  Issue: 1 )