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An Intercomparison Study of the Germanium Isotope Composition of Geological Reference Materials ArchiMer
Escoube, Raphalle; Rouxel, Olivier; Luais, Beatrice; Ponzevera, Emmanuel; Donard, Olivier F. X..
Recent analytical developments in germanium stable isotope determination by multicollector ICP-MS have provided new perspectives for the use of Ge isotopes as geochemical tracers. Here, we report the germanium isotope composition of the NIST SRM 3120a elemental reference solution that has been calibrated relative to internal isotopic standard solutions used in the previous studies. We also intercalibrate several geological reference materials as well as geological and meteoritic samples using different techniques, including online hydride generation and a spray chamber for sample introduction to MC-ICP-MS, and different approaches for mass bias corrections such as samplecalibrator bracketing, external mass bias correction using Ga isotopes and double-spike...
Tipo: Text Palavras-chave: Germanium; Isotope; Intercalibration; Reference materials; Germanium; Isotope; Intercalibration; Materiaux de reference.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00089/20036/21743.pdf
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Lessons learned from an intercalibration exercise on the quantification and characterisation of microplastic particles in sediment and water samples ArchiMer
Cadiou, Jean-francois; Gerigny, Olivia; Koren, Š.; Zeri, C.; Kaberi, H.; Alomar, C.; Panti, C.; Fossi, M.c.; Adamopoulou, A.; Digka, N.; Deudero, S.; Concato, M.; Carbonell, A.; Baini, M.; Galli, M.; Galgani, Francois.
An intercalibration exercise on the characterisation of microplastics in marine sediment and water samples was carried out among five laboratories involved in the implementation of the Marine Strategy Framework Directive (MSFD) in their country. The samples were prepared by mixing cleaned natural sediment and sea water with microplastics sets made of particles of various polymers, shapes and colours. Overall, the errors on total counts were under 25% in absolute value. The risk of non-detection and loss of particles is greater than the risk of contamination during sample analysis. Significant differences are observed among particle types. It appears difficult to obtain reliable and comparable data on the colour of microplastics. A comparison of the errors...
Tipo: Text Palavras-chave: Microplastics; Intercalibration; Protocols; Sediment; Seawater.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00622/73397/72812.pdf
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Report on an intercalibration exercise on a short-term standard toxicity test with <i>Artemia</i> nauplii (ARC-test) OMA
Vanhaecke, P.; Persoone, G..
Considering the necessity for standardization of toxicity tests and the need for simple and reliable routine tests, the <i>Artemia</i> Reference Center at the State University of Ghent in Belgium has developed a short term standard toxicity test with <i>Artemia</i> nauplii. This simple and inexpensive bioassay which can be used as a screening test to determine the toxicity of chemicals to aquatic organisms, has been discussed in detail during a special workshop devoted to toxicity tests with brine shrimp, at the occasion of the "International Symposium on the brine shrimp <i><i>Artemia</i> salina</i>"(Corpus Christi, Texas, USA; August 1979). Besides a few minor modifications, the test methodology was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Intercalibration; Nauplii; Toxicity tests; Artemia.
Ano: 1981 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3377
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