scholarly journals In Situ Quantitative Raman Detection of Dissolved Carbon Dioxide and Sulfate in Deep-Sea High-Temperature Hydrothermal Vent Fluids

2018 ◽  
Vol 19 (6) ◽  
pp. 1809-1823 ◽  
Author(s):  
Lianfu Li ◽  
Xin Zhang ◽  
Zhendong Luan ◽  
Zengfeng Du ◽  
Shichuan Xi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Dissolved Carbon ◽  
Dissolved Carbon Dioxide

scholarly journals Real‐time dissolved carbon dioxide monitoring I: Application of a novel in situ sensor for CO 2 monitoring and control

2020 ◽  
Vol 117 (4) ◽  
pp. 981-991 ◽  
Author(s):  
Viki R. Chopda ◽  
Timothy Holzberg ◽  
Xudong Ge ◽  
Brandon Folio ◽  
Michael Tolosa ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Real Time ◽  
Monitoring And Control ◽  
Dissolved Carbon ◽  
Dissolved Carbon Dioxide ◽  
Carbon Dioxide Monitoring ◽  
In Situ Sensor ◽  
And Control

scholarly journals In situ Raman quantitative detection of methane concentrations in deep‐sea high‐temperature hydrothermal vent fluids

2020 ◽  
Vol 51 (11) ◽  
pp. 2328-2337
Author(s):  
Lianfu Li ◽  
Xin Zhang ◽  
Zhendong Luan ◽  
Zengfeng Du ◽  
Shichuan Xi ◽  
...  
Keyword(s):  
High Temperature ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Quantitative Detection ◽  
In Situ Raman ◽  
Methane Concentrations

Impact of Dursban and Abate on Microbial Numbers and Some Chemical Properties of Standing Ponds

1975 ◽  
Vol 10 (1) ◽  
pp. 33-41 ◽  
Author(s):  
J. Butcher ◽  
M. Boyer ◽  
CD. Fowle
Keyword(s):  
Carbon Dioxide ◽  
Active Ingredient ◽  
Algal Blooms ◽  
Chemical Properties ◽  
Total Carbon ◽  
Dissolved Carbon ◽  
Photosynthetic Productivity ◽  
Dissolved Carbon Dioxide ◽  
Microbial Numbers

Abstract Eleven small ponds, lined with polyethylene, were used to assess the consequences of applications of *DursbanR at 0.004, 0.030, 0.100 and 1.000 ppm and AbateR at 0.025 and 0.100 ppm active ingredient. The treated ponds showed a more pronounced long-term increase in pH and dissolved oxygen and decreasing total and dissolved carbon dioxide in comparison with untreated ponds. Algal blooms were of longer duration in treated ponds than in controls. Total photosynthetic productivity was higher in treated ponds but bacterial numbers did not change significantly. Photosynthetic productivity was estimated by following the changes in total carbon dioxide.

scholarly journals Development of an Easy-to-Operate Underwater Raman System for Deep-Sea Cold Seep and Hydrothermal Vent In Situ Detection

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5090
Author(s):  
Qingsheng Liu ◽  
Jinjia Guo ◽  
Wangquan Ye ◽  
Kai Cheng ◽  
Fujun Qi ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Methane Hydrate ◽  
Sulfur Cycle ◽  
Cold Seep ◽  
Remotely Operated Vehicle ◽  
Bacterial Mats ◽  
Optical Module ◽  
In Situ Detection

As a powerful in situ detection technique, Raman spectroscopy is becoming a popular underwater investigation method, especially in deep-sea research. In this paper, an easy-to-operate underwater Raman system with a compact design and competitive sensitivity is introduced. All the components, including the optical module and the electronic module, were packaged in an L362 × Φ172 mm titanium capsule with a weight of 20 kg in the air (about 12 kg in water). By optimising the laser coupling mode and focusing lens parameters, a competitive sensitivity was achieved with the detection limit of SO42− being 0.7 mmol/L. The first sea trial was carried out with the aid of a 3000 m grade remotely operated vehicle (ROV) “FCV3000” in October 2018. Over 20,000 spectra were captured from the targets interested, including methane hydrate, clamshell in the area of cold seep, and bacterial mats around a hydrothermal vent, with a maximum depth of 1038 m. A Raman peak at 2592 cm−1 was found in the methane hydrate spectra, which revealed the presence of hydrogen sulfide in the seeping gas. In addition, we also found sulfur in the bacterial mats, confirming the involvement of micro-organisms in the sulfur cycle in the hydrothermal field. It is expected that the system can be developed as a universal deep-sea survey and detection equipment in the near future.

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