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Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...
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Flow Cytometry01:23

Flow Cytometry

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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
In...
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Related Experiment Video

Updated: Oct 2, 2025

A Simple Method for Automated Solid Phase Extraction of Water Samples for Immunological Analysis of Small Pollutants
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Flow-Injection Methods in Water Analysis-Recent Developments.

Marek Trojanowicz1,2, Marta Pyszynska1

  • 1Laboratory of Nuclear Analytical Methods, Institute of Nuclear Chemistry and Technology, Dorodna 16, 02-195 Warsaw, Poland.

Molecules (Basel, Switzerland)
|February 25, 2022
PubMed
Summary

Flow-injection analysis has advanced water quality testing over the last decade. This method offers improved reliability, efficiency, and cost-effectiveness for analyzing diverse water samples and contaminants.

Keywords:
ICP-MSelectrochemical detectionsflow-injection analysismicrofluidicsportable instrumentsspectrophotometrywater analysis

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Growing demand for water quality analysis and control for human needs and ecosystem health.
  • Need for continuous improvement in water analysis methods for reliability, efficiency, and cost.

Purpose of the Study:

  • Review advancements in flow-injection analysis (FIA) for water quality assessment over the past ten years.
  • Highlight methodologies, microfluidics, portable systems, and diverse applications of FIA.

Main Methods:

  • Review of approximately 100 original research papers published in the last decade.
  • Analysis of methodologies for flow-injection measurements, including microfluidics and portable systems.

Main Results:

  • FIA applications cover inorganic analytes, elemental speciation, and total water quality indices.
  • Determination of organic residues like pesticides, phenolic compounds, and surfactants in various water types.
  • Improvements in detection limits, sampling rates, and selectivity achieved through modified manual procedures.

Conclusions:

  • Flow-injection analysis has significantly evolved, offering enhanced capabilities for water quality monitoring.
  • FIA, incorporating microfluidics and portable systems, provides efficient and reliable solutions for diverse analytical challenges in water analysis.