Page 148 - Analytical method for food addtives

E220–8: Sulphites 93

Table 8.4 cont’d
Interlaboratory test carried out by Swedish National Food Administration 7
Sample Wine Dried apples
Analyte Sulphite Sulphite Sulphite
No. of laboratories 6 10 10
Units mg/L mg/kg mg/kg
Mean value 75 800 960
S r 3 106 128
RSD 4% 13 % 13 %
r
r 8 298 358
S R 6 111 133
RSD 8 % 14 % 14 %
R
R 16 311 374
Sample Lemon juice Potato flakes
Analyte Sulphite Sulphite Sulphite
No. of laboratories 10 10 10
Units mg/L mg/kg mg/kg
Mean value 270 28.3 110
S 13
r
RSD 5 %
r
r 37
S 28 13 15
R
RSD 10 % 45 % 13 %
R
R 79 36 42
Key
Mean The observed mean. The mean obtained from the collaborative trial data.
r Repeatability (within laboratory variation). The value below which the absolute difference
between two single test results obtained with the same method on identical test material under the
same conditions may be expected to lie with 95 % probability.
S r The standard deviation of the repeatability.
RSD The relative standard deviation of the repeatability (S × 100/mean).
r
r
R Reproducibility (between-lab variation). The value below which the absolute difference between
two single test results obtained with the same method on the identical test material under different
conditions may be expected to lie with 95 % probability.
S R The standard deviation of the reproducibility.
RSD The relative standard deviation of the reproducibility (S × 100/mean).
R R