On a possible bias in elemental carbon measurements with the Sunset thermal/optical carbon analyser caused by unstable laser signal

We present results that demonstrate a possible bias in the fractioning of total carbon (TC) into elemental carbon (EC) and organic carbon (OC) for measurements with the Sunset Laboratory Inc. Thermal/Optical Carbon Aerosol Analyser. The bias is caused by an unstable laser transmission signal. The transmission signal during the analysis of an instrument blank filter can give an indication of the possible bias. If the transmission signal around the OC/EC split point deviates from its initial value, the EC attribution is altered. In a sensitivity study, we show that for a deviation of 10% the EC content is substantially biased

Airliner cabin air quality: emissions of organophosphates originating from aircraft engine oil. Experimental lab simulation and measurements on flight

In our simulation experiments, using e.g., a dedicated emission chamber, the emission of organophosphates as tricresyl phosphate (TCP) was studied using turbine oil. Experiments were carried out at 250°C and 370°C. Subsequently field studies were carried out to detect the presence of TCPs in the cockpit during normal operating conditions of Boeing 737 aircrafts. In both studies four TCP isomers were identified: T(m,m,m)CP, T(m,m,p)CP, T(m,p,p)CP and T(p,p,p)CP . No T(o,o,o)CP or other ortho isomers were foun

Verantwoording operationalisering roetindicator in Nederland

In opdracht van het Ministerie van I&M heeft TNO in samenwerking met het RIVM, DCMR en GGD-Amsterdam een roetindicator geoperationaliseerd. De roetindicator is gebaseerd op elementair koolstof (EC) concentraties in de buitenlucht. Met deze indicator kunnen lokale overheden gezondheidsaspecten meewegen in besluitvorming over verkeersmaatregelen