Table 1.

Verified concentrations of matrix-matched standards by ID-ICP-MS. Results are expressed as mean value ± standard deviation (n = 9)

Standard (Std)/quality control (QC)	Uranium concentration (ng g−1)
QC 1	20 ± 1
Std 1	59 ± 12
Std 2	107 ± 11
Std 3	505 ± 71
QC 2	1042 ± 92
Std 4	6824 ± 649
QC 3	9384 ± 1792
Std 5	14,483 ± 2352
Std 6	16,218 ± 402