Fant 9765 publikasjoner. Viser side 298 av 391:
2000
2012
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
Determining the background levels of dioxin-like chemicals in central South Africa. Abstract. NILU F
2007
2011
2011
2004
2005
2006
2019
2004
2000
2023
2001
2005
2001
2000
2011
2014
2010
2005
2018
2010
2016