Found 9830 publications. Showing page 385 of 394:
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2023
Science Press
2019
Verification of stack heights for expansion of the aluminium smelter at Karmøy. NILU rapport
smelter. The model results show that the impact is in compliance with the limit values for the environment for all components except for hydrogen fluoride. The guideline for effect of hydrogen fluoride versus vegetation is exceeded in an area covering 25 km2, inclusive of the factory area and areas at sea. Impacted land area outside the plant is 11,5 km2. Emission from the roof of the production hall contributes 95 % of the total concentration within the area of exceedance.
2016
We describe the outcome of a large international interlaboratory study of the measurement of particle number concentration of colloidal nanoparticles, project 10 of the technical working area 34, “Nanoparticle Populations” of the Versailles Project on Advanced Materials and Standards (VAMAS). A total of 50 laboratories delivered results for the number concentration of 30 nm gold colloidal nanoparticles measured using particle tracking analysis (PTA), single particle inductively coupled plasma mass spectrometry (spICP-MS), ultraviolet-visible (UV-Vis) light spectroscopy, centrifugal liquid sedimentation (CLS) and small angle X-ray scattering (SAXS). The study provides quantitative data to evaluate the repeatability of these methods and their reproducibility in the measurement of number concentration of model nanoparticle systems following a common measurement protocol. We find that the population-averaging methods of SAXS, CLS and UV-Vis have high measurement repeatability and reproducibility, with between-labs variability of 2.6%, 11% and 1.4% respectively. However, results may be significantly biased for reasons including inaccurate material properties whose values are used to compute the number concentration. Particle-counting method results are less reproducibile than population-averaging methods, with measured between-labs variability of 68% and 46% for PTA and spICP-MS respectively. This study provides the stakeholder community with important comparative data to underpin measurement reproducibility and method validation for number concentration of nanoparticles.
Royal Society of Chemistry (RSC)
2022
ThermoFisher Scientific
2018