Found 9890 publications. Showing page 174 of 396:
Measurements of sucralose in the Swedish screening program 2007. Part II: Sucralose in biota samples and regional STP samples. IVL Report, B1795
2008
Measurements of sucralose in the Swedish screening program 2007. Part I: Sucralose in surface waters and STP samples. IVL Report, B1769
2008
2016
Measurements of PM1, PM2.5 and PM10 in air at Nordic background stations using low-cost equipment. IVL Report, B1791
2008
2013
2002
Measurements of particulate matter inside the EMEP framework during 2004. Report series in aerosol science, No. 92
2008
Measurements of particles in urban areas around the world. A comparison of levels and causes. NILU F
2013
2013
2002
2018
To estimate the oxidative potential (OP) of particulate matter (PM), two commonly used cell-free, molecular probes were applied: dithiothreitol (DTT) and dichloro-dihydro-fluorescein diacetate (DCFH-DA), and their performance was compared with 9,10-bis (phenylethynyl) anthracene-nitroxide (BPEAnit). To the best of our knowledge, this is the first study in which the performance of the DTT and DCFH has been compared with the BPEAnit probe. The average concentrations of PM, organic carbon (OC) and elemental carbon (EC) for fine (PM2.5) and coarse (PM10) particles were determined. The results were 44.8 ± 13.7, 9.8 ± 5.1 and 9.3 ± 4.8 µg·m−3 for PM2.5 and 75.5 ± 25.1, 16.3 ± 8.7 and 11.8 ± 5.3 µg·m−3 for PM10, respectively, for PM, OC and EC. The water-soluble organic carbon (WSOC) fraction accounted for 42 ± 14% and 28 ± 9% of organic carbon in PM2.5 and PM10, respectively. The average volume normalized OP values for the three assays depended on both the sampling periods and the PM fractions. The OPBPEAnit had its peak at 2 p.m.; in the afternoon, it was three times higher compared to the morning and late afternoon values. The DCFH and BPEAnit results were correlated (r = 0.64), while there was no good agreement between the BPEAnit and the DTT (r = 0.14). The total organic content of PM does not necessarily represent oxidative capacity and it shows varying correlation with the OP. With respect to the two PM fractions studied, the OP was mostly associated with smaller particles.
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