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Microinjectrode System for Combined Drug Infusion and Electrophysiology
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Solenoid pumps for flow injection analysis.

D A Weeks1, K S Johnson

  • 1Moss Landing Marine Laboratories and Monterey Bay Aquarium Research Institute, P.O. Box 450, Moss Landing, California 95039.

Analytical Chemistry
|May 31, 2011
PubMed
Summary
This summary is machine-generated.

This study replaces conventional peristaltic pumps in flow injection analysis (FIA) with solenoid-driven diaphragm pumps. This innovation reduces size and power needs for in situ seawater analysis, maintaining high performance.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Instrumentation Engineering

Background:

  • Flow injection analysis (FIA) is crucial for in situ seawater analysis.
  • Conventional FIA systems often use bulky peristaltic pumps, limiting miniaturization and increasing power demands.
  • Improvements in pump technology are needed for smaller, more efficient, and microprocessor-controlled FIA systems.

Purpose of the Study:

  • To replace peristaltic pumps in FIA with solenoid-driven diaphragm pumps.
  • To assess the performance of this new pump system for in situ seawater analysis.
  • To evaluate the potential for reduced size, power, and improved control in FIA.

Main Methods:

  • Replaced the peristaltic pump in a standard FIA setup with three solenoid-driven diaphragm pumps.
  • Incorporated integral Viton check valves into the diaphragm pumps.
  • Tested the system using a nitrite analysis method with well-defined FIA characteristics.

Main Results:

  • Achieved 60 injections per hour with flow rates of 0.5 mL/min for reagents and sample.
  • Obtained a coefficient of variation of 1% for 10 μM nitrite (NO2-) concentrations.
  • Established a detection limit below 0.1 μM NO2-, comparable to peristaltic pump performance.

Conclusions:

  • Solenoid-driven diaphragm pumps offer a viable alternative to peristaltic pumps in FIA.
  • This technology enables smaller, more power-efficient FIA systems for in situ applications.
  • The system demonstrates potential for microprocessor control and extended maintenance intervals.