146 / 274
1102
J
ulshamn
et al
.
:
J
ournal of
AOAC I
nternational
V
ol
. 96, N
o
. 5, 2013
Table 1. Interlaboratory study results for As, Cd, Hg, and Pb
Matrix
x
, mg/kg
a
n
b
s
r
, mg/kg
c
s
R
, mg/kg
d
RSD
r
, %
e
RSD
R
, %
f
r, mg/kg
g
R, mg/kg
h
HorRat
i
As
Carrot
<LOD
4 [0/8]
—
— — — —
—
—
Fish muscle
1.6
11 [0/1]
0.086
0.14
5.4
9
0.24
0.4
0.6
Mushroom
0.057
9 [1/2]
0.014
0.016
24
28
0.038
0.044
1.2
Wheat flour
<LOD
2 [0/10]
—
— — — —
—
—
Simulated diet
<LOD
5 [1/6]
—
— — — —
—
—
Scampi
19.1
12 [0/0]
0.73
2.3
3.8
12
3.8
6.4
1.2
Mussel
9.3
12 [0/0]
0.45
1.2
4.9
13
1.2
3.4
1.2
Cd
Carrot
0.3
13 [0/0]
0.008
0.027
2.7
9
0.023
0.076
0.47
Fish muscle
0.87
13 [0/0]
0.06
0.095
6.9
11
0.17
0.27
0.67
Mushroom
0.46
13 [0/0]
0.017
0.033
3.8
7.2
0.049
0.092
0.4
Wheat flour
0.03
12 [1/0]
0.002
0.006
6.4
18
0.084
0.24
0.8
Simulated diet
0.52
13 [0/0]
0.013
0.044
2.6
8.4
0.037
0.12
0.48
Scampi
0.078
11 [2/0]
0.0022
0.012
2.8
2.8
0.0062
0.032
0.63
Mussel
1.7
12 [1/0]
0.0043
0.17
2.5
9.9
0.12
0.47
0.67
Hg
Carrot
<LOD
4 [0/8]
—
— — — —
—
—
Fish muscle
0.096
11 [1/0]
0.0079
0.016
8.2
17
0.022
0,045
0.74
Mushroom
0.23
10 [2/0]
0.011
0.023
5
9.9
0.032
0.063
0.5
Wheat flour
<LOD
3 [0/9]
—
— — — —
—
—
Simulated diet
0.042
8 [2/2]
0.0035
0.01
8.3
24
0.0099
0.029
1.1
Scampi
0.56
12 [0/0]
0.027
0.093
4.8
17
0.075
0.26
0.96
Mussel
0.15
11 [1/0]
0.01
0.023
6.9
15
0.029
0.064
0.72
Pb
Carrot
0.086
13 [0/0]
0.0039
0.0091
4.5
11
0.011
0.025
0.45
Fish muscle
2.1
13 [0/0]
0.1
0.17
4.8
8
0.29
0.47
0.56
Mushroom
1.5
12 [1/0]
0.098
0.14
6.7
9.5
0.27
0.39
0.63
Wheat flour
0.013
7 [0/6]
0.0034
0.0063
27
50
0.0095
0.018
2.2
Simulated diet
0.26
13 [0/0]
0.023
0.029
8.7
11
0.063
0.082
0.57
Scampi
1.14
13 [0/0]
0.056
0.11
4.9
9.3
0.16
0.3
0.59
Mussel
2.4
13 [0/0]
0.068
0.19
2.9
8
0.19
0.53
0.57
a
x
= Mean.
b
n
= Number of laboratories remaining after elimination of outliers/reporting <LOD in brackets.
c
s
r
= Repeatability SD.
d
s
R
= Reproducibility SD.
e
RSD
r
= Repeatability RSD.
f
RSD
R
= Reproducibility RSD.
g
r = Repeatability value.
h
R = Reproducibility value.
i
HorRat = Horwitz ratio.
94