Ring trial with additional molecular testing methods
They shall be submitted to a ring trial with at least
(ii) Ring trial with additional molecular testing methods
For the quantification of total folates (including added folic acid) in feedingstuffs and water: microbiological assay — based on CEN-ring trial validated method EN 14131.
Four laboratories have successfully participated in a ring trial conducted by the CRL between July 2003 and March 2004 to test their proficiency in using molecular typing methods.
2) the establishment of a circular test performed from the same soil samples in laboratories in several countries.
2) the establishment of a circular test performed from the same soil samples in laboratories in several countries.
Determination of enzyme activities by colorimetry - Realization of a circular interlaboratory test
10 laboratories participated to the 2nd ring test and 4 different methods were applied
(ii) Secondary molecular testing with additional molecular testing methods
Nine laboratories participated to the 1st ring test and no specifications were provided about the analytical methods to use
Due to the results obtained, two methods were chosen to perform the 3rd ring test
In an EU ring-test of five surfactants added at 10 mg C/l, the following results were obtained
10 laboratories participated to the 2nd ring test and 4 different methods were applied:
The two approaches were combined in the ISO Headspace CO2 Standard , which was ring-tested and it is this Standard which forms the basis of the present Test Method.
Due to the results obtained, two methods were chosen to perform the 3rd ring test:
Nine laboratories participated to the 1st ring test and no specifications were provided about the analytical methods to use:
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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