A versatile mercury vapour generating system suitable for long-term inhalation experiments

Area of Science:

• Environmental Science
• Toxicology
• Analytical Chemistry

Background:

• Mercury vapor exposure is a significant concern in various industrial and research settings.
• Accurate generation of controlled mercury vapor concentrations is crucial for toxicological studies and exposure assessments.

Purpose of the Study:

• To develop and describe a novel, continuous-flow mercury vapor generation system.
• To provide a method for achieving and measuring specific mercury vapor concentrations for inhalation exposure.

Main Methods:

• A system based on the reduction of mercuric chloride (HgCl2) with stannous chloride (SnCl2) in an airstream.
• Utilized peristaltic pumps for precise chemical delivery, a reduction chamber, and continuous airflow into an inhalation chamber.
• Concentration measurement via mercury vapor monitor or 203HgCl2 radioactivity with hopcalite absorption.

Main Results:

• The system allows for continuous mercury vapor generation and exposure by enabling uninterrupted reservoir refilling and collection flask emptying.
• Mercury vapor concentration can be precisely controlled by adjusting the rate of mercury injection and airflow.
• Experimental validation included operation instructions and an example using mice exposure.

Conclusions:

• The described mercury vapor generation system offers a reliable and controllable method for inhalation exposure studies.
• The system's design facilitates continuous operation, crucial for long-term or repeated exposure experiments.
• This method provides a valuable tool for research in mercury toxicology and environmental monitoring.