Table 2.
Zn concentrations and isotope compositions of six biological RMs
| Sample/data source | δ66/64ZnIRMM-3702 (‰) | ±2sd | ±2se | n | m | [Zn] ±1sd (μg/g) | Digest weight (mg) |
|---|---|---|---|---|---|---|---|
| ERM-BB422—fish muscle | |||||||
| Digest 1 | −0.37 | 0.08 | 2 | 1 | 16.7 | 62 | |
| Digest 2 | −0.32 | 0.08 | 2 | 1 | 15.9 | 196 | |
| Digest 3 | −0.33 | 0.07 | 2 | 1 | 15.4 | 230 | |
| Digest 4 | −0.33 | 0.07 | 2 | 2 | 16.2 | 212 | |
| Mean | −0.34 | 0.04 | 0.01 | 8 | 5 | 16.0 ± 0.5 | |
| Certificate [50] | 16.0 ± 1.1 | ||||||
| ERM-BB184—bovine muscle | |||||||
| Digest 1 | −0.36 | 0.08 | 4 | 2 | 152.0 | 66 | |
| Digest 2 | −0.31 | 0.07 | 2 | 2 | 151.0 | 63 | |
| Digest 3 | −0.23 | 0.08 | 4 | 2 | 151.3 | 213 | |
| Digest 4 | −0.29 | 0.06 | 4 | 2 | 152.6 | 243 | |
| Mean | −0.30 | 0.10 | 0.03 | 14 | 8 | 151.5 ± 0.4 | |
| Reference [22] | −0.24 | 0.02 | |||||
| Certificate [48] | 146 ± 7.0 | ||||||
| ERM-BB186—pig kidney | |||||||
| Digest 1 | −0.73 | 0.07 | 2 | 2 | 144.0 | 42 | |
| Digest 2 | −0.69 | 0.08 | 4 | 3 | 144.0 | 56 | |
| Digest 3 | −0.63 | 0.08 | 2 | 1 | 144.9 | 195 | |
| Digest 4 | −0.66 | 0.08 | 2 | 1 | 145.2 | 218 | |
| Digest 5 | −0.55 | 0.08 | 2 | 1 | 144.6 | 204 | |
| Mean | −0.65 | 0.13 | 0.04 | 12 | 8 | 144.5 ± 0.7 | |
| Certificate [49] | 134 ± 5 | ||||||
| ERM-DB001—human hair | |||||||
| Digest 1 | −0.33 | 0.07 | 3 | 2 | 197.4 | 53 | |
| Digest 2 | −0.32 | 0.07 | 3 | 2 | 201.9 | 43 | |
| Digest 3 | −0.32 | 0.07 | 3 | 2 | 203.2 | 238 | |
| Digest 4 | −0.28 | 0.07 | 3 | 2 | 211.8 | 204 | |
| Mean | −0.31 | 0.04 | 0.01 | 12 | 8 | 203.6 ± 5.9 | |
| Certificate [52] | 209 ± 12.0 | ||||||
| Trace elements urine—L-1 | |||||||
| Digest 1—vial 1 | −0.05 | 0.07 | 3 | 2 | 0.216 | 2020 | |
| Digest 2—vial 1 | −0.06 | 0.11 | 2 | 2 | 0.233 | 1997 | |
| Digest 3—vial 2 | −0.05 | 0.02 | 2 | 2 | 0.214 | 1870 | |
| Digest 4—vial 2 | −0.07 | 0.06 | 1 | 2 | 0.218 | 2018 | |
| Digest 5—vial 1&2 | −0.03 | 0.06 | 1 | 1 | 0.221 | 1995 | |
| Mean | −0.05 | 0.03 | 0.01 | 9 | 9 | 0.221 ± 0.008 | |
| Certificate [53] | 0.347 ± 0.035 | ||||||
| BCR-639—human blood serum | |||||||
| Digest 1—batch 1 | −3.25 | 0.08 | 2 | 1 | 2.43 | 242 | |
| Digest 2—batch 1 | −3.34 | 0.08 | 2 | 1 | 2.55 | 250 | |
| Digest 3—batch 1 | −3.39 | 0.08 | 1 | 1 | 2.43 | 250 | |
| Digest 4—batch 1 | −3.27 | 0.08 | 1 | 1 | 2.27 | 246 | |
| Digest 5—batch 2 | −3.22 | 0.08 | 1 | 1 | 2.43 | 245 | |
| Digest 6—batch 2 | −3.24 | 0.08 | 1 | 1 | 2.53 | 248 | |
| Digest 7—batch 2 | −3.33 | 0.10 | 1 | 1 | 2.37 | 266 | |
| Digest 8—batch 2 | −3.32 | 0.10 | 1 | 1 | 2.29 | 227 | |
| Mean | −3.29 | 0.12 | 0.04 | 10 | 8 | 2.41 ± 0.10 | |
| Reference [21] | −3.06 | 0.20 | |||||
| Certificate [51] | 2.36 ± 0.14 | ||||||
The 2sd data for the δ66/64Zn values of individual digest are based on repeat analyses of the matching standard, whereas the 2sd and 2se for the mean δ66/64Zn values of each RM (italicised) are calculated from all individual RM measurements. The total number of measurements and the number of individual sample aliquots that went through the separation chemistry for each digest and RM are denoted by ‘n’ and ‘m’, respectively