Sampling
The following sampling systems are available at the GSA for the sampling of polychlorinated biphenyls (PCBs):
- PM4-2 with one cartridge according to VDI 2463/7 (stationary sampling)
- GSA50 with a cartridge according to VDI 2463/7 (stationary sampling)
Stationary sampling is usually carried out with PM4-2.
The air loaded with polychlorinated biphenyls (PCB) is sucked in by means of a volume flow-controlled pump (PM4-2) with a volume flow of 46 l/min. We recommend a measurement period of 1 h. Polychlorinated biphenyls (PCBs) are sucked out of the air through the cartridge and adsorbed.
A glass fibre filter (binder-free) and two polyurethane foams, each with a diameter of 50 mm, are used as filter media.
Analysis
The analytical determination is carried out by means of HRGC/ECD analysis (High-resolution Gas Chromatography with Electron-Capture Detection).
Limit value
The guideline for the assessment and remediation of PCB-contaminated building materials and components in buildings of July 1996 issued by the NRW Ministry for Building and Housing states the following limit values:
– In the case of indoor air concentrations above 3,000 ng PCB per m³ air, remediation must be initiated immediately.
– For indoor air concentrations in the range of 300-3,000 ng/m³, medium-term measures are required (search for sources, cleaning, ventilation). The remediation goal is to reduce the concentration to values below 300 ng/m³ within 1-2 year.
– Indoor air concentrations below 300 ng/m³ are tolerable in the long term (precautionary value).
Stationary measurement of PCB