Analytes in (µg/mL)
Conctrn.
1
st
Freeze/Thaw cycle (24 hrs) n=6
2
nd
Freeze/Thaw cycle(48 hrs)
3
rd
Freeze/Thaw cycle (72 hrs)
% Change in Accuracy after three F/T Cycles
QC's
% Accuracy
% Accuracy
% Accuracy
Nitrates in BJ
12.5
102.6
99.18
98.78
-3.72
25
115.08
94.29
102.42
-11
100
112.5
98.94
99.45
-11.6
Nitrites in BJ
12.5
112.2
101.1
99.11
-11.67
25
99.29
98.13
95.21
-4.11
100
99.12
98.12
98.22
-0.91
Nitrates in CBJ
12.5
96.23
98.25
95.36
-0.9
25
84.5
95.46
82.33
-2.57
100
88.12
90.17
82.13
-6.8
Nitrites in CBJ
12.5
90.23
89.38
90.27
0.04
25
103.38
87.33
80.04
-22.57
100
100.23
113.5
99.5
-0.73
Nitrates in SP
12.5
111.21
101.6
112.2
0.89
25
112.51
94.58
96.33
-14.38
100
112.23
102.5
99.59
-11.26
Nitrites in SP
12.5
99.26
100.2
98.6
-0.66
25
100
96.25
88.75
-11.25
100
104.5
99.85
99.58
-4.71
Table 4:
Stability results for nitrates-nitrites containing food stuffs during freezethaw cycles.
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