Fighting Air Pollution: Tracking and Retaining Particulate Matter
Monitoring in Accordance with DIN EN14902
Particle-bound Pb, Cd, As and Ni as constituents of PM10 in the ambient air are to be monitored to evaluate air quality. Following the norm, filter material is digested with nitric acid and hydrogen peroxide at 220° C for 25 min in a microwave digestion system and subsequently spectrometrically analysed.
In order to digest more than one filter at once the method was optimized. Beside the required HNO3:H2O2 8:2 (V:V) additionally 10mL of H2O was added. This ensures a complete immersion of the filters in the solution and minimizes the risk of low recoveries.
The accuracy of the method was proofed by determination of the recovery (n=3) of ERM CZ-120 (fine dust PM10-like) after microwave-assisted digestion and ICP-MS analysis.
Particle Analysis the Easy Way
The digestion was done with the new microwave digestion system Speedwave Entry from Berghof. Because of its light-weight and space saving design, Speedwave Entry is especially suitable for routine analysis, training and study. Like all Berghof digestion systems, the instrument convinces with its easy handling. Beside the proven digestion vessel made of TFM-PTFE, the Quickstart controller offers a comfortable operation.
By means of a pool of pre-installed applications the microwave only needs two key presses to start the digestion process. The patented Speedwave DIRC thermometer ensures safe reaction control without need of any reference vessel. An increased sample throughput is obtained by the external exhaust unit enabling a 20 % faster cooling rate of digestion vessel.