Found 9759 publications. Showing page 321 of 391:
2020
2020
Determining the Bio‐Based Carbon Content of Surfactants
In response to a mandate from the European Commission, the European Committee for Standardization (CEN) called on the technical committee CEN/TC 276 to develop a European standard (EN 17035) to define bio‐based surfactants and enable quantification of the bio‐based carbon content of surfactants based on radiocarbon analyses. This analytical approach was tested through directly contracted analyses and through a round robin procedure at commercial facilities in Europe. Initial results were unsatisfactory and further investigation identified issues surrounding the degree of homogenization in the samples. In general, the samples were only homogeneous at the gram level while the maximum quantity of material that could be introduced to the analytical process was at the milligram level. Having identified the root cause of the discrepancies between measured and expected results, new samples were sent to six European laboratories. The results were satisfactory indicating linearity and accuracy across the measurement range.
AOCS Press
2020
2020
2020
2020
2020
Revidert tiltaksutredning for lokal luftkvalitet i Stavanger
The air quality assessment for Stavanger covers mapping of the air quality in Stavanger through traffic, emission and dispersion calculations of PM10, PM2,5 and NO2 for the present situation (2018) and future scenarios (2024) with and without measures. Based on the calculations and in coordination with Stavanger municipality, a plan for improved local air quality and a management plan for periods with high concentration levels is proposed for political processing.
NILU
2020
Norsk institutt for vannforskning
2020
2020
2020
2020
2020