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).
