1502
P
OITEVINETAL.
: J
OURNALOF
AOACI
NTERNATIONAL
V
OL
. 92,N
O
. 5, 2009
Table 18. SLVstudy: accuracy, precision, andHorRat values found for phosphorus insevencertifiedand in-house referencematerialsusing recommendedand
alternate lines
Material description
Line
Reference
value,mg/kg
a,b
Median±U,
mg/kg
c
Recovery,%
P
-value
d
SD
r
,mg/kg
e
SD
iR
,mg/kg
f
RSD
r
,% RSD
iR
,% HorRat
g
Sterilizedcream
P
h
823±22
807±60
98±3
0.56
32
53
4.0
6.6
1.1
P
i
821±56
99±3
0.95
36
49
4.4
6.0
1.0
P
i
783±82
95±4
0.26
32
76
4.1
9.6
1.6
Chocolatemilkpowder
P
h
4080±30
4110±150
101±1
0.60
67
138
1.6
3.4
0.7
P
i
4150±88
102±1
0.61
60
70
1.5
1.7
0.4
P
i
4050±85
99±1
0.59
60
70
1.6
1.8
0.4
Infant cereals
P
h
4320±21
4470±165
104±1
0.02
53
136
1.2
3.1
0.7
P
i
4510±297
104±2
0.10
77
279
1.7
6.2
1.4
P
i
4340±116
100±1
0.69
63
110
1.5
2.5
0.6
Cornbran
P
h
171±6
163±18
95±4
0.86
2
17
1.4
10.4
1.4
P
i
166±9
97±4
0.44
2
7
1.3
4.4
0.6
P
i
162±8
95±3
0.17
3
5
1.6
3.2
0.4
Dieteticmilkpowder 1
P
h
3080±11
3100±65
101±1
0.27
28
58
0.9
1.9
0.4
P
i
3120±68
101±1
0.12
37
63
1.2
2.0
0.4
P
i
3080±43
100±1
0.65
21
39
0.7
1.3
0.3
Pet food
P
h
4510±40
4630±122
103±1
0.05
48
92
1.0
2.0
0.4
P
i
4620±176
102±2
0.16
63
72
1.5
1.7
0.4
P
i
4490±88
100±1
0.67
61.0
78
1.3
1.7
0.4
Nonfatmilkpowder
P
h
10600±100 10830±845
102±3
0.46
169
788
1.6
7.3
1.9
P
i
10840±981
102±3
0.50
200
922
1.8
8.5
2.2
P
i
10500±707
99±2
0.71
144
657
1.4
6.3
1.6
a
SDexpressedashalf of stateduncertainty (NISTandLGCcertifiedmaterials) givenas95%confidence interval.
b
SDexpressedasa reproducibilitySD(in-house referencematerials) calculatedaccording to robust statistics (29).
c
Uncertainty (U) estimated throughsimplifiedapproach (30, 31).
d
Statisticevaluationof robust
t
-test: Satisfactory result (
P
>0.05); questionable result (0.01<
P
<0.05); unsatisfactory result (
P
<0.01).
e
SD
r
=SDof repeatability.
f
SD
iR
=SDof intermediate reproducibility.
g
HorRat =RatiousingRSD
iR
andHorwitzdenominator according to ref. 32.
h
Recommended line for ICP-AESanalysis.
i
Alternateconfirmatory lines for ICP-AESanalysis.
MTE-01
FORWORKINGGROUP/ERPUSEONLY
DONOTDISTRIBUTE
