TUP DNPH sampling tube is used for collecting aldehyde and ketone gas samples，and utilizes the derivative agent DNPH (2,4-dinitrophenylhydrazine) to react specifically with carbonyl compounds, and the resulting derivatives are then separated by chromatography. It is mainly used for the collection of aldehyde and ketone pollutants in automobiles and indoor air. TUP provides DNPH cartridges in various specifications and varieties to meet different customer application needs, such as trace-level detection, high-concentration detection, and ozone removal.