Division 8.4 Results of inter-laboratory test
United Kingdom
An inter-laboratory test was carried out in 2005 and 2006 with participation of the European Customs laboratories. This test was performed in accordance with ISO 5725 and the IUPAC protocol (W. Horwitz, Pure and Applied Chemistry, vol. 67, 1995, p. 331-343). The precision data are given in the table below.
Statistical results of the inter-laboratory study
| Samples 1dry dog food dry cat food dry cat food (sample 2) with addition of starch dry cat food (sample 2) with addition of beet pulp commercial pet food | |||||
| Sample | |||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| Number of laboratories after eliminating outliers | 25 | 26 | 26 | 25 | 24 |
| Number of accepted results | 50 | 52 | 52 | 50 | 48 |
| Mean starch content (%, m/m) | 31,2 | 14,4 | 25,1 | 12,9 | 27,8 |
| Repeatability standard deviation sr(%, m/m) | 0,4 | 0,3 | 0,6 | 0,2 | 0,3 |
| Repeatability limit r (%, m/m) | 1,1 | 0,8 | 1,7 | 0,7 | 0,9 |
| Reproducibility standard deviation sR(%, m/m) | 1,7 | 0,8 | 1,7 | 0,9 | 1,3 |
| Reproducibility limit R (%, m/m) | 4,8 | 2,2 | 4,7 | 2,5 | 3,7 |