Two sediment samples were collected in Queensland region, Australia using a Van Veen type sampler. One site was sampled in Townsville Marina and the other in Townsville Ross River. Frozen samples were sent from Brisbane to IAEA laboratories in Monaco. Sediment sample was freeze-dried, micronized at 20 µm and γ-irradiated at doses ranging from 27 to 39.5 kGy. The final powdered composite sediment, about 15 kg, was homogenized by mixing it in a stainless-steel rotating drum for three weeks. Then, aliquots of about 50 grams were packaged into cleaned amber glass bottles with screw caps and
| Compound | Unit | Certified value1 | U (k=2)2 |
| Naphthalene | µg kg-1 | 4.5 | 1.8 |
| 2-Methylnaphthalene | µg kg-1 | 2.4 | 0.7 |
| 1-Methylnaphthalene | µg kg-1 | 1.4 | 0.5 |
| Phenanthrene | µg kg-1 | 4.6 | 1.3 |
| Anthracene | µg kg-1 | 1.3 | 0.5 |
| 1-Methylphenanthrene | µg kg-1 | 1.5 | 0.6 |
| 2-Methylphenanthrene | µg kg-1 | 2.4 | 0.9 |
| C1-Phen/Anth | µg kg-1 | 7.6 | 2.3 |
| Fluoranthene | µg kg-1 | 6.6 | 1.7 |
| Pyrene | µg kg-1 | 6.2 | 1.6 |
| Benz[a]anthracene | µg kg-1 | 2.4 | 0.6 |
1 The value is the mean of the means of the accepted sets of data, each set being obtained by different laboratory. The certified values are reported on dry mass basis and are traceable to the SI.
2 Expanded uncertainty evaluated according to ISO Guide 35 [1] with a coverage factor k=2 estimated in accordance with the JCGM 100:2008 Evaluation of measurement data – Guide to the expression of uncertainty in measurement [2], corresponding to the level of confidence of about 95%.
Certified mass fraction values (Cont.)
(based on dry mass)
| Compound | Unit | Certified value1 | U (k=2)2 |
| Chrysene (+ Triphenylene) | µg kg-1 | 3.5 | 0.9 |
| C1-Chrysenes | µg kg-1 | 4.1 | 1.3 |
| Benzo[b+j]fluoranthene | µg kg-1 | 5.0 | 1.2 |
| Benzo[k]fluoranthene | µg kg-1 | 2.1 | 0.6 |
| Benzo[e]pyrene | µg kg-1 | 3.9 | 1.3 |
| Benzo[a]pyrene | µg kg-1 | 2.9 | 0.7 |
| Indeno[1,2,3-c,d]pyrene | µg kg-1 | 2.6 | 0.7 |
| Benzo[g,h,i]perylene | µg kg-1 | 3.0 | 0.7 |
1 The value is the mean of the mean of the accepted sets of data, each set being obtained by different laboratory. The certified values are reported on dry mass basis and are traceable to the SI.
2 Expanded uncertainty evaluated according to ISO Guide 35 [1] with a coverage factor k=2 estimated in accordance with the JCGM 100:2008 Evaluation of measurement data – Guide to the expression of uncertainty in measurement [2], corresponding to the level of confidence of about 95%.
