Explanation

According to the American ASTM D3960-98 standard, VOC is defined as any organic compound that can participate in atmospheric photochemical reactions. The US Environmental Protection Agency (EPA) defines volatile organic compounds as any organic compound that is volatile and can participate in atmospheric photochemical reaction, except for some specific substances (such as CO, CO2, H2CO3, metal carbide, metal carbonate and ammonium carbonate). The World Health Organization (WHO, 1989) defines total volatile organic compounds (TVOC) as the sum of those volatile organic compounds with low melting point at room temperature and boiling point between 50 ° C and 250 ° C. The international standard ISO 4618/1-1998 and the German standard DIN 55649-2000 usually define VOC as an organic liquid and/or solid that can spontaneously evaporate at room temperature and pressure. In addition, DIN 55649-2000 standard has a certain limit on volatile organic compound content, requiring their boiling point or initial boiling point to be lower than or equal to 250 ° C.

Classification