Various measured itemsVOCThe total is called total volatile organic compoundsTVOC（Total Volatile Organic Compounds）.

TVOCAt room temperature, the saturated vapor pressure exceeds133．32paIts boiling point is50℃ to250℃ exists in the air in a form that can evaporate at room temperature. Its toxicity, irritability, carcinogenicity, and special odor can affect the skin and mucous membranes, causing acute damage to the human body. World Health Organization（WHO）The National Academy of Sciences in the United States/National Research Council（NAS/NRC）The institution has been emphasizingTVOCIt is an important type of air pollutant.TVOCThe main classifications include benzene, alkanes, aromatic hydrocarbons, alkenes, halogenated hydrocarbons, esters, aldehydes, ketones, etc.

fixed typePIDPhoton ion organic volatile matter detection involves inserting a sampling probe into the sampled soil and aligning it deep into the soil for analysis.