A high quality, cost effective service
PM10 and PM2.5
Filter weighing under controlled temperature and humidity conditions. Data validation and QA/QC audit visits for Partisols, TEOMs, Particle counters/sizers and other automatic particulate measurements equipment. Occupational health particulate measurement.
Techniques for particle counting and sizing, aimed primarily at smaller particles in the range 1 - 500 nm, typically known as 'ultrafine particles' or 'nanoparticles'. We currently maintain and calibrate the Defra Particle Size and number network, as well as carrying out laboratory research into the use of these instruments.
UKAS accredited service for particulate metals analysis by ICP-MS and vapour phase mercury by CV-AFS, as performed by NPL for the UK Metals Network. Sampling, data validation and QA/QC visits for metals sampling equipment.
Organic carbon / elemental carbon
NPL's particle speciation facilities include a Sunset Laboratories Carbon Aerosol Analysis Instrument, which measures the organic and elemental carbon content of particulate matter that has been sampled onto quartz filters following recognised standard methods.
Sampling and analysis for sulphate, nitrate, chloride and other anions by Ion Chromatography. Data validation and QA/QC visits for automated speciation equipment as carried out for the Defra Particle Counting and Speciation Network.
Polycyclic aromatic hydrocarbons (PAHs)
NPL has a UKAS accredited service for the analysis of particulate and vapour-phase PAHs in ambient air using gas chromatography-mass spectroscopy.