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Related Concept Videos

Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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Measurement of Fluid Pressure01:16

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In Situ Soil Moisture Sensors in Undisturbed Soils
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An Autonomous Sensor and Telemetry System for Low-Level pCO(2) Measurements in Seawater.

M B Tabacco1, M Uttamlal, M McAllister

  • 1Max Tishler Laboratory for Organic Chemistry, Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155.

Analytical Chemistry
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

A novel fiber-optic sensor accurately measures low-level dissolved carbon dioxide (CO2) in seawater. This sensor enables continuous monitoring of partial pressure of CO2 (pCO2) in marine environments.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Oceanography

Background:

  • Accurate measurement of dissolved carbon dioxide (CO2) is crucial for understanding ocean acidification and climate change.
  • Traditional methods for CO2 measurement can be complex and time-consuming.
  • Development of sensitive and real-time monitoring systems is needed.

Purpose of the Study:

  • To describe a new fiber-optic sensor for measuring low-level dissolved CO2.
  • To evaluate the sensor's performance characteristics, including dynamic range, sensitivity, and response time.
  • To demonstrate the sensor's capability for continuous pCO2 monitoring in surface seawater.

Main Methods:

  • A fiber-optic sensor was developed based on the Severinghaus CO2 electrode principle.
  • The sensor utilizes a CO2-sensitive bicarbonate buffer with a pH-sensitive fluorescent dye (carboxy-SNAFL-1) immobilized on an optical fiber.
  • The sensor operates in a ratiometric mode and is protected by a gas-permeable membrane.

Main Results:

  • The sensor demonstrated a reversible working dynamic range of 200-1000 ppm pCO2 with a sensitivity of ±1 ppm.
  • Calibration, temperature effects, and response time characteristics were evaluated.
  • Continuous monitoring of pCO2 in surface seawater was successfully demonstrated in Vineyard Sound, MA, using an integrated system with satellite transmission.

Conclusions:

  • The developed fiber-optic sensor provides a sensitive and reliable method for measuring low-level dissolved CO2.
  • The sensor system is suitable for continuous, real-time pCO2 monitoring in marine environments.
  • This technology can contribute to improved understanding of oceanic carbon cycling and climate change impacts.