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Acta Oceanologica Sinica

, Volume 38, Issue 9, pp 128–134 | Cite as

A multi-channel chemical sensor and its application in detecting hydrothermal vents

  • Zhen Cai
  • A J Mur Luis
  • Jiwan Han
  • Kui Wang
  • Huawei QinEmail author
  • Ying Ye
Article

Abstract

There are well-established chemical and turbidity anomalies in the plumes occurring vicinity of hydrothermal vents, which are used to indicate their existence and locations. We here develop a small, accurate multi-channel chemical sensor to detect such anomalies which can be used in deep-sea at depths of more than 4 000 m. The design allowed five all-solid-state electrodes to be mounted on it and each (apart from one reference electrode) could be changed according to chemicals to be measured. Two experiments were conducted using the chemical sensors. The first was a shallow-sea trial which included sample measurements and in situ monitoring. pH, Eh, CO 3 2− and SO 4 2− electrodes were utilized to demonstrate that the chemical sensor was accurate and stable outside the laboratory. In the second experiment, the chemical sensor was integrated with pH, Eh, CO 3 2− and H2S electrodes, and was used in 29 scans of the seabed along the Southwest Indian Ridge (SWIR) to detect hydrothermal vents, from which 27 sets of valid data were obtained. Hydrothermal vents were identified by analyzing the chemical anomalies, the primary judging criteria were decreasing voltages of Eh and H2S, matched by increasing voltages of pH and CO 3 2− . We proposed that simultaneous detection of changes in these parameters will indicate a hydrothermal vent. Amongst the 27 valid sets of data, five potential hydrothermal vents were targeted using the proposed method. We suggest that our sensors could be widely employed by marine scientists.

Key words

chemical sensor multi-channel hydrothermal vents detection chemical anomalies SWIR 

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Copyright information

© Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zhen Cai
    • 1
  • A J Mur Luis
    • 2
  • Jiwan Han
    • 2
  • Kui Wang
    • 3
    • 4
  • Huawei Qin
    • 5
    Email author
  • Ying Ye
    • 1
  1. 1.Ocean CollegeZhejiang UniversityZhoushanChina
  2. 2.Environmental and Rural Sciences, Institute of BiologicalAberystwyth UniversityAberystwythUK
  3. 3.Key Laboratory of Marine Ecosystem and BiogeochemistryState Oceanic AdministrationHangzhouChina
  4. 4.Second Institute of OceanographyMinistry of Natural ResourcesHangzhouChina
  5. 5.Institute of Mechanical EngineeringHangzhou Dianzi UniversityHangzhouChina

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