Formaldehyde quantification using gas chromatography-mass spectrometry reveals high background environmental...

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Toxicology

Background:

• Formaldehyde (HCHO) is a toxic pollutant and endogenous metabolite.
• Accurate quantification of HCHO in biological samples is challenging due to limited sensitive methods.
• Previous work introduced a Solid-Phase Microextraction-Gas Chromatography-Mass Spectrometry (SPME-GC-MS) method using cysteamine as a scavenger.

Purpose of the Study:

• To optimize a headspace SPME-GC-MS method for HCHO quantification.
• To investigate the background levels of HCHO in aqueous samples.
• To assess the implications of background HCHO levels on quantification accuracy.

Main Methods:

• Developed and optimized a headspace SPME-GC-MS method utilizing cysteamine as an HCHO scavenger.
• Employed a complementary GC-MS analysis with a 2-aza-Cope-based HCHO scavenger.
• Evaluated HCHO quantification in aqueous and biological samples.

Main Results:

• The optimized headspace SPME-GC-MS method achieved sensitive HCHO quantification, comparable to immersive extraction.
• High background HCHO levels were consistently observed across different analytical approaches.
• Both cysteamine and 2-aza-Cope scavenger methods indicated significant background HCHO.

Conclusions:

• High background formaldehyde levels (micromolar) in aqueous samples limit accurate quantification below this range.
• The presence of endogenous or contaminant formaldehyde impacts HCHO measurements in biological and environmental samples.
• Further research is needed to address the high background HCHO issue for precise quantification.