Division 8 Results of a collaborative study
United Kingdom
A collaborative study was arranged in which 5 samples were analysed by 11 laboratories. These samples consisted of two premixtures; one was mixed with an organic matrix (O 100) and the other with an inorganic matrix (A 100). The theoretical content is 100 mg diclazuril per kg. The three mixed feeds for poultry were made by 3 different producers (NL) (L1/Z1/K1). The theoretical content is 1 mg diclazuril per kg. The laboratories were instructed to analyse each of the samples once or in duplicate. (More detailed information on this collaborative study can be found in the Journal of AOAC International, Volume 77, No 6, 1994, p. 1359-1361). The results are given in the following table.
| Sample 1A 100 | Sample 2O 100 | Sample 3L1 | Sample 4Z1 | Sample 5K1 | |
|---|---|---|---|---|---|
| L | 11 | 11 | 11 | 11 | 6 |
| n | 19 | 18 | 19 | 19 | 12 |
| Mean | 100,8 | 103,5 | 0,89 | 1,15 | 0,89 |
| Sr (mg/kg) | 5,88 | 7,64 | 0,15 | 0,02 | 0,03 |
| CVr (%) | 5,83 | 7,38 | 17,32 | 1,92 | 3,34 |
| SR (mg/kg) | 7,59 | 7,64 | 0,17 | 0,11 | 0,12 |
| CVR (%) | 7,53 | 7,38 | 18,61 | 9,67 | 13,65 |
| Nominal content (mg/kg) | 100 | 100 | 1 | 1 | 1 |
number of laboratories
number of single values
standard deviation of repeatability
coefficient of variation of repeatability
standard deviation of reproducibility
coefficient of variation of reproducibility