The results from the analysis of 14C-MeOH are not consistent with nominal values in most cases (Table 23). Some of the participants reported that they could not find any 14C-MeOH in any of the samples while others reported a low concentration of 14C-MeOH in comparison with the nominal value for some samples. Some laboratories did not apply the enrichment process (distillation) to measure low concentrations of 14C-MeOH while others attempted to distill samples but still found zero or low concentrations.
The results reported from Vietnam are acceptable. Measurements were carried out soon after receipt of the samples, on 21 January 2008. Upon receipt of various comments from participating laboratories regarding the difficulties of measuring 14C-MeOH in the samples, CANTI’s tracer laboratory was requested to measure a stored reference set of samples (29 June 2008). The new analysis showed the same difficulty or problem previously observed and reported by the other laboratories. There was close to zero activity of 14C in the stored samples (Table 24).
|
TABLE 22. ANALYTICAL RESULTS OF НТО FROM PARTICIPATING LABORATORIES
|
No.
|
Prep. cone. ±la (Bq/L)
|
|
|
Measured concentration ±la (Bq/L)
|
|
|
|
Argentina
|
Brazil
|
China
|
France
|
Indonesia
|
Norway
|
Pakistan
|
Vietnam
|
|
A1
|
0.0
|
0.6 ±4.5
|
<3 + 2.1
|
251+6.1
|
2.0 ±0.1
|
6.2
|
<2
|
0 + 3.8
|
0.0
|
|
A2
|
14.8+0.7
|
15.4 + 4.7
|
7.2 ±2.5
|
288 ±7.0
|
15.8 ± 0.5
|
18.1
|
17+1.0
|
12.4 + 5.7
|
11.1+0.7
|
|
A3
|
14.8+0.7
|
19.8 + 4.8
|
7.2 ±2.4
|
275 ±6.7
|
15.8 ± 0.5
|
17.1
|
14 + 1.0
|
9.2 ±5.5
|
14.0 + 0.9
|
|
A4
|
0.0
|
1.3 ± 4.5
|
<3 + 2.2
|
249 + 6.0
|
2.0 ±0.1
|
11.0
|
<2
|
0.0 ±2.9
|
1.3±0.1
|
|
2A5
|
148 + 7
|
155 ±6.3
|
140.8 + 8.5
|
453+ 10
|
154 + 3.0
|
122
|
132 ±3.0
|
139.7 + 8.1
|
135 ±5.2
|
|
A6
|
0.0
|
6.3 ±4.6
|
<3 + 2.1
|
229 ±5.6
|
<2
|
16.7
|
<2
|
0.0 ±3.2
|
0.0
|
|
A7
|
592 +30
|
57 + 59.5
|
568 ±26
|
1110 ± 26
|
597 + 8.0
|
490
|
649 ± 7.0
|
622.8+ 18.9
|
558 ± 12
|
|
A8
|
14.8+0.7
|
17.3 + 4.7
|
8.2 ±2.6
|
276 ±6.7
|
13.8 ±0.2
|
19.2
|
14 ± 1.0
|
0.0 ±3.3
|
16.8± 1.1
|
|
A9
|
148 + 7
|
157 ± 0.3
|
145 + 7.5
|
428 + 9.7
|
142 ±0.3
|
131
|
165 ±3.0
|
142.1 + 8.9
|
138 ±5.5
|
|
A10
|
14.8 + 0.7
|
17.9 ±4.7
|
15.7 + 2.4
|
242 + 6.1
|
11.0+2.0
|
32.5
|
18+1.0
|
12.6 + 6.1
|
10.4 + 0.6
|
|
All
|
592 ± 30
|
582 ±9.5
|
600 ± 28
|
998 ±25
|
583 + 8.0
|
497
|
647 ± 7.0
|
645.1 ± 19.9
|
551 ± 12
|
|
A12
|
148 + 7
|
160 + 6.3
|
142 ± 8.0
|
477 ± 11
|
150 ±3.0
|
126
|
165 + 3.0
|
148.5 ±8.4
|
134 + 4.9
|
|
A13
|
592 ± 30
|
598 + 9.6
|
588 ±28
|
1060 ±5.5
|
600 ± 8.0
|
497
|
660 ± 7.0
|
651.9 ± 20.5
|
550 ± 12
|
|
A14
|
148 + 7
|
159 ±6.3
|
144 ±8.2
|
433 + 9.7
|
140 ±3.0
|
135
|
167 ±3.0
|
148.5 ±8.3
|
132 ±4.9
|
|
A15
|
592 ± 30
|
568.3 ±9.4
|
586 + 29
|
1010 + 23
|
600 ± 8.0
|
504
|
641 ±6.0
|
613.1 ± 19.7
|
543 ± 12
|
|
FIG. 84. Radar plot representation of the datasets.
|
TABLE 23. ANALYTICAL RESULTS OF 14C-MEOH FROM PARTICIPATING LABORATORIES
|
No.
|
Prepared conc. ±1a (Bq/L)
|
Measured concentration ±1a (Bq/L)
|
|
Brazil
|
France
|
Norway
|
Vietnam
|
|
A2
|
0.74 + 0.4
|
n. d. ±1.4
|
<0.005
|
|
0.78 ± 0.23
|
|
A3
|
0.0
|
0.8a ± 1.5
|
<0.005
|
|
0.32
|
|
A4
|
7.4 + 0.4
|
2.9a ± 1.6
|
<0.005
|
|
6.20 ± 0.46
|
|
A5
|
0.0
|
n. d. ± 1.6
|
<0.005
|
|
0.21
|
|
A6
|
74 + 4
|
6.95 ± 0.44
|
37.8 ± 0.40
|
32 ± 1.5
|
76.92 ± 4.92
|
|
A7
|
0.0
|
0.9a ± 1.5
|
<0.005
|
|
0.12
|
|
A8
|
7.4 + 0.4
|
n. d. ± 1.6
|
0.46 ± 0.01
|
|
8.95 ± 0.68
|
|
A9
|
0.74 + 0.04
|
n. d. ± 1.4
|
<0.005
|
32 ± 1.5
|
0.94 ± 0.15
|
|
A10
|
74 + 4
|
n. d. ± 1.5
|
46.9 ± 0.50
|
|
65.44 ± 5.17
|
|
A11
|
0.74 + 0.04
|
0.4a ± 1.5
|
<0.005
|
|
0.81 ± 0.13
|
|
A12
|
7.4 + 0.4
|
n. d. ± 1.4
|
0.21 ± 0.01
|
|
6.08 ± 0.82
|
|
A13
|
7.4 + 0.4
|
n. d. ± 1.5
|
<0.005
|
|
8.26 ± 1.10
|
|
A14
|
74 + 4
|
1.0a ± 1.4
|
22.75 ± 0.33
|
14.5 ± 1.2
|
71.37 ± 3.75
|
|
A15
|
74 + 4
|
0.2a ± 1.4
|
18.11 ± 0.31
|
18 ± 1.2
|
± 6.85
|
|
a Values below detection limit.
|
|
|
|
|
|
TABLE 24. ANALYTICAL RESULTS FROM TRACER LABORATORY (CANTI) FOR TWO DIFFERENT MEASUREMENTS
|
|
No.
|
Prepared conc. 14C-MeOH concentration (Bq/L) 14C-MeOH concentration (Bq/L) (Bq/L) (Measured 21-25 January 2008 (Measured 29 June to 4 July 2008 Glass bottles. Distillation PE bottles. Distillation procedure procedure applied) applied)
|
|
A1
|
0.74
|
0.94
|
|
0
|
|
|
A2
|
0.74
|
0.68
|
|
0
|
|
|
A3
|
0
|
0
|
|
0
|
|
|
|
TABLE 24. ANALYTICAL RESULTS FROM TRACER LABORATORY (CANTI) FOR TWO DIFFERENT MEASUREMENTS (cont.)
No. Prepared conc. 14C-MeOH concentration (Bq/L) 14C-MeOH concentration (Bq/L)
|
(Bq/L)
|
(Measured 21-25 January 2008 Glass bottles. Distillation procedure applied)
|
(Measured 29 June to 4 July 2008 PE bottles. Distillation procedure applied)
|
|
A4
|
7.4
|
6.20
|
0
|
|
A5
|
0
|
0
|
0
|
|
A6
|
74.0
|
76.92
|
0.92
|
|
A7
|
0
|
0
|
0
|
|
A8
|
7.4
|
8.95
|
0
|
|
A9
|
0.74
|
1.08
|
0
|
|
A10
|
74
|
65.44
|
0.2
|
|
A11
|
0.74
|
0.81
|
0
|
|
A12
|
7.4
|
6.08
|
0
|
|
A13
|
7.4
|
8.26
|
0
|
|
A14
|
74.0
|
53.52
|
0.77
|
|
A15
|
74.0
|
91.39
|
0.51
|
|
|
TABLE 25. ORIGINAL STANDARD SOLUTIONS OF HTO AND 14C-MEOH
|
Original standard
|
Supplier
|
Model/lot number
|
Solvent
|
Concentration
(Bq/mL)
|
Calibration date
|
|
HTO
|
ARC
|
ART 0194A /Lot: 070427
|
Water
|
3.7E7 + 1%
|
13 August 2007
|
|
14C-MeOH
|
ARC
|
ART 0194A /Lot: 070305
|
MeOH
|
3.7E6 + 1%
|
19 February 2007
|
|
