AS NZS 3580.9.6:2015 pdf free
AS NZS 3580.9.6:2015 pdf free.Methods for sampling and analysis of ambient air
This Standard specifies a gravimetric method for the determination of suspended particulate matter in ambient air. The method provides a measure of mean concentration of PM10 over the sampling period employed. A procedure for assessing the performance of PM1o samplers, so that they comply with the sampling requirements of this method, is also described.
NOTES:
1 Sampling is normally of 24 h duration to average out the effect of the diurnal variations in particle levels and to enable collection of sufficient mass of particulate matter. Provided that the mass of the filter is determined under carefully controlled laboratory conditions, mean concentrations of 1 μg/m’ and greater may be determined using a 24 h sampling period.
2 It is possible that some particulate matter, depending upon its hygroscopicity or volatility may alter in mass from its initial as-sampled state because of the environmental conditions and filter equilibration procedure referred to in Clauses 7.1 and 7.8. The degree of mass change is largely due to the nature of the sampled aerosol and may vary from day to day, site to site and seasonally.
Ambient air is drawn at a constant flow rate through a prepared filter via a PMio size-selective inlet where the suspended particulate matter is inertially separated, with particles larger than PM10 being retained on a layer of grease. The PM10 fraction of suspended particulate matter is collected on a prepared filter mounted in the high volume sampler filter holder and subsequently weighed (gravimetric method). The PM10 concentration is determined by dividing the mass of collected particulate matter by the sample volume, which is calculated from the sample duration and either the average or totalized flow rate.
Because the collection efficiency of the size-selective inlet is dependent on its geometry, periodic checking, inspection and maintenance is necessary to ensure that the dimensions are within the manufacturer’s specifications.AS NZS 3580.9.6 pdf free download.
