Materiales de referencia y comparaciones interlaboratorios
II. Aplicaciones y Desarrollo
94
www.
materialesdereferencia
.cl
Country
Number of
participating
laboratories
Australia
1
Canada
9
Chile
1
China
2
Czech Republic
3
Denmark
2
Finland
2
France
3
Germany
7
Greece
1
Italy
5
Japan
3
New Zealand
1
Norway
1
Russia
1
South Corea
1
Sweden
1
Taiwan
2
United Kingdom
3
United States of America
3
Table 1: Country of origin of participating
laboratories.
Organisation credibility
Our organisation is accreditated as a proficiency testing provider (ILAC–G13 and ISO/
CEI guide 43) and as a testing laboratory (ISO/CEI 17025) by the Standard Council of
Canada.
III. Results and discussion
Summary results for the two samples and the standard solution are presented in
tables 2 to 4.
The average relative standard deviation for the sludge samples is significantly higher
than that of the standard solutions, which is probably due to the number of steps
needed to prepare the sludge samples. Sludge sample #2 has also a higher relative
standard deviation compared to sludge #1,for the three studied parameters,probably
because this material is more complex to deal with.
Sludge #1
Sludge #2
Standard solution
Congener
Median value
(n=)
Rel. std.
dev. (%)
Median value
(n=)
Rel. std.
dev. (%)
Median value
(n=)
Rel. std.
dev. (%)
Prepared
concentration
(ng/ml)
2,3,7,8-TCDD
0.88 (45)
47
0.64 (38)
82
14.7 (39)
9
15
1,2,3,7,8-PeCDD
4.33 (69)
32
3.00 (53)
33
29.0 (37)
11
30
1,2,3,4,7,8-HxCDD
6.20 (71)
18
2.58 (54)
19
29.0 (39)
10
30
1,2,3,6,7,8-HxCDD
14.70 (73)
17
8.40 (65)
27
29.2 (38)
9
30
1,2,3,7,8,9-HxCDD
12.20 (73)
24
5.54 (64)
31
30.0 (37)
11
30
1,2,3,4,6,7,8-HpCDD
320.0 (71)
11
176.1 (59)
15
62.4 (38)
12
60
OCDD
2634 (72)
13
1607 (76)
25
62.9 (36)
9
60
2,3,7,8-TCDF
3.50 (70)
28
2.04 (59)
24
15.1 (35)
11
15
1,2,3,7,8-PeCDF
3.00 (65)
32
0.91 (42)
37
31.2 (37)
11
30
2,3,4,7,8-PeCDF
4.20 (73)
31
1.90 (51)
30
31.0 (37)
8
30
1,2,3,4,7,8-HxCDF
8.16 (72)
27
2.82 (58)
25
30.1 (37)
10
30
1,2,3,6,7,8-HxCDF
6.68 (70)
20
2.60 (58)
25
31.2 (37)
9
30
2,3,4,6,7,8-HxCDF
6.71 (70)
31
3.60 (65)
29
30.5 (37)
11
30
1,2,3,7,8,9-HxCDF
0.85 (31)
57
0.56 (22)
82
30.0 (35)
13
30
1,2,3,4,6,7,8-HpCDF
102.0 (70)
15
65.1 (60)
12
61.5 (36)
12
60
1,2,3,4,7,8,9-HpCDF
6.87 (66)
29
2.40 (50)
32
59.9 (36)
12
60
OCDF
360.0 (77)
19
174.1 (74)
16
59.8 (34)
10
60
Table 2: Results for the PCDD/DFs (results as pg/g, dry weight basis).
Sludge #1
Sludge #2
Standard solution
Congener
Median value
(n=)
Rel. std.
dev. (%)
Median value
(n=)
Rel. std.
dev. (%)
Median
value
(n=)
Rel. std.
dev. (%)
Prepared
concentration
(ng/ml)
BDE 28
1970 (35)
19
7680 (35)
17
26.0 (19)
18
25
BDE 49
3370 (24)
17
15300 (28)
41
25.7 (12)
24
25
BDE 71
761 (16)
66
2000 (15)
98
26.7 (14)
15
25
BDE 47
123200 (34)
9
491000 (38)
19
25.2 (20)
17
25
BDE 100
29000 (36)
16
117000 (35)
17
25.1 (20)
18
25
BDE 99
150000 (37)
15
604000 (37)
16
26.3 (20)
19
25
BDE 154
12800 (33)
10
53900 (34)
9
49.1 (19)
15
50
BDE 153
18400 (38)
13
68900 (35)
12
48.0 (19)
11
50
BDE 183
9430 (32)
24
10600 (34)
14
50.5 (17)
13
50
BDE 206
12300 (23)
55
21900 (22)
45
115.0 (12)
20
125
BDE 209
364000 (30)
35
610000 (35)
45
128.7 (14)
24
125
Table 3: Results for the PBDEs (results as pg/g, dry weight basis)
