Sampling and analytical methods for phosphine--a review.

Area of Science:

• Industrial Hygiene
• Analytical Chemistry
• Environmental Monitoring

Background:

• Phosphine (PH3) is a toxic gas requiring accurate monitoring in industrial settings.
• Traditional sampling and analysis methods have limitations in accuracy and convenience.
• Advances in analytical techniques necessitate a review of current practices.

Purpose of the Study:

• To provide an overview of phosphine sampling and analysis techniques.
• To emphasize the importance of these methods in industrial hygiene.
• To compare the strengths and weaknesses of various analytical and sampling approaches.

Main Methods:

• Review of recent advances in solid sorbent materials for sampling.
• Evaluation of gas chromatography for phosphine analysis.
• Assessment of filter paper impregnated with silver nitrate (AgNO3) and colorimetric analysis.
• Comparison of analytical methods: gas chromatography, chromogenic, colorimetric, and electrochemical.
• Comparison of sampling methods: impregnated papers, solid sorbents, bubblers, and evacuated cylinders.

Main Results:

• Solid sorbents offer advanced options for phosphine sampling, suitable for gas chromatographic analysis.
• Filter paper with AgNO3 and subsequent colorimetric analysis remains a dependable technique.
• Each analytical and sampling method possesses distinct advantages and disadvantages.

Conclusions:

• Accurate phosphine monitoring is crucial for industrial hygiene and worker safety.
• A range of effective sampling and analytical tools are available, each with specific applications.
• Method selection should consider the specific industrial environment and required accuracy.