The lake sediment material IAEA-SL-1 was collected and prepared
by Drs. J.C. Richie and C. Cooper (US Department of Agriculture, Agricultural
Research Service, USDA Sedimentation Laboratory, Oxford, Mississippi, USA) and
donated to the IAEA. The sediment was collected at the Sardis Reservoir, Panola
County, Mississippi, USA (water depth: 15 m). The material was dried in an oven,
then ground and sieved. The fraction of the material which passed through a
0.1mm sieve was sent to the IAEA for further processing. This material was
γ-sterilized to ensure long-term stability of the material by inhibiting
microbial action.
| Analyte | Value | Unit | 95% C.I. | N | R/I/C |
|---|
| As | 27.6 | mg/kg | 24.7 – 30.5 | 24 | R |
| Ba | 639 | mg/kg | 586 – 692 | 15 | R |
| Cd | 0.26 | mg/kg | 0.21 – 0.31 | 7 | I |
| Ce | 117 | mg/kg | 100 – 134 | 8 | R |
| Co | 19.8 | mg/kg | 18.3 – 21.3 | 35 | R |
| Cr | 104 | mg/kg | 95 – 113 | 34 | I |
| Cs | 7 | mg/kg | 6.1 – 7.9 | 20 | I |
| Cu | 30 | mg/kg | 24 – 36 | 31 | I |
| Dy | 7.5 | mg/kg | 5.3 – 9.7 | 5 | I |
| Eu | 1.6 | mg/kg | 1.1 – 2.1 | 10 | I |
| Fe | 67400 | mg/kg | 65700 – 69100 | 35 | R |
| Ga | 23.7 | mg/kg | 18.6 – 28.8 | 11 | I |
| Hf | 4.2 | mg/kg | 3.6 – 4.8 | 7 | I |
| Hg | 0.13 | mg/kg | 0.08 – 0.18 | 5 | I |
| K | 14500 | mg/kg | 12400 – 16600 | 7 | I |
| La | 52.6 | mg/kg | 49.5 – 55.7 | 26 | R |
| Lu | 0.54 | mg/kg | 0.41 – 0.67 | 10 | I |
| Mn | 3460 | mg/kg | 3300 – 3620 | 34 | R |
| Na | 1700 | mg/kg | 1600 – 1800 | 5 | I |
| Ni | 44.9 | mg/kg | 36.9 – 53.9 | 11 | I |
| Pb | 37.7 | mg/kg | 30.3 – 45.1 | 20 | I |
| Rb | 113 | mg/kg | 102 – 124 | 12 | R |
| Sb | 1.31 | mg/kg | 1.19 – 1.43 | 15 | I |
| Sc | 17.3 | mg/kg | 16.2 – 18.4 | 16 | I |
| Se | 2.85 | mg/kg | 1.31 – 4.37 | 7 | I |
| Sm | 9.25 | mg/kg | 8.74 – 9.76 | 8 | I |
| Sr | 80 | mg/kg | 37 – 123 | 7 | I |
| Ta | 1.58 | mg/kg | 1.00 – 2.16 | 6 | I |
| Tb | 1.4 | mg/kg | 0.94 – 1.86 | 7 | I |
| Th | 14 | mg/kg | 13 – 15 | 18 | R |
| Ti | 5170 | mg/kg | 4740 – 5600 | 15 | R |
| U | 4.02 | mg/kg | 3.69 – 4.35 | 15 | I |
| V | 170 | mg/kg | 155 – 185 | 20 | R |
| Yb | 3.42 | mg/kg | 2.77 – 4.07 | 5 | I |
| Zn | 223 | mg/kg | 213 – 233 | 26 | R |
(Value) Concentration
calculated as a mean of the accepted laboratory means
(N) Number of accepted laboratory means which are
used to calculate the recommended or information values and their respective
confidence intervals
(R/I/C)
Classification assigned to the property value for analyte
(Recommended/Information/Certified)
The values listed above were
established on the basis of statistically valid results submitted by
laboratories which had participated in one or more international interlaboratory
comparisons organized by the Chemistry Unit, IAEA Laboratories, Seibersdorf. The
details concerning the criteria for qualification as a recommended or
information value can be found in the respective report (attached).
