| abstract |
A volatile organic compound measuring apparatus (VOC) capable of accurately and easily measuring benzene, toluene, xylene and formaldehyde as indoor air components is provided. A VOC having a first line L1 for a low boiling point component (LB), a second line L2 for a high boiling point component (HB), and a carrier gas C supply source of L1 and L2, wherein L1 is It has a first pre-column P1 that separates LB from HB, a first main column M1 that adsorbs and desorbs the eluted LB, and a first detector D1 that detects the eluted component, and L2 has a higher boiling point component than HB. A second pre-column P2 that separates the separated HB, a second main column M2 that separates the eluted HB into each component, and a second detector D2 that detects each separated component, and when LB elutes from P1 A first supply line G1 that supplies C between P1 and M1 and a second supply line G2 that supplies C between P2 and M2 when HB elutes from P2 are provided to backflush P1 and P2. C is discharged upstream. [Selection] Figure 1 |