Table 3.
Accuracy, precision and uncertainty of the XOS prototype instrument based on analysis of certified reference materials.
| CRM | Matrix | Element | Certified (mg/kg) | ±U | XOS prototype (mg/kg) | %RSD | %Bias | n | Variability |
|---|---|---|---|---|---|---|---|---|---|
| BCR 627 | Tuna Fish Tissue | As | 4.8 | 0.3 | 5 | 0 | 4 | 5 | Within-day |
| DORM 2 | Dogfish Muscle | As | 18 | 1.1 | 17 | 9 | −7 | 10 | Within-day |
| Cr | 34.7 | 5.5 | 23 | 29 | −33 | ||||
| Cu | 2.34 | 0.16 | 2 | 0 | −15 | ||||
| Fe | 142 | 10 | 102 | 19 | −28 | ||||
| Mn | 3.66 | 0.34 | ND | - | - | ||||
| Hg | 4.64 | 0.26 | 3 | 15 | −40 | ||||
| Ni | 19.4 | 3.1 | 11 | 22 | −44 | ||||
| Se | 1.4 | 0.09 | 2 | 23 | 29 | ||||
| Zn | 25.6 | 2.3 | 25 | 28 | −2 | ||||
| SRM 612 | Glass Matrix | Ba* | 41 | 75.5 | 30 | 84 | 5 | Within-day | |
| Co* | 35.5 | 1.2 | 43.6 | 5 | 23 | ||||
| Cu* | 37.7 | 0.09 | 51 | 5 | 35 | ||||
| Au* | 5 | ND | - | - | |||||
| Fe | 51 | 2 | 36.4 | 8 | −29 | ||||
| Mn* | 39.6 | 0.8 | 24.4 | 8 | −38 | ||||
| Ni | 38.8 | 0.2 | 50.6 | 6 | 30 | ||||
| Ag | 22 | 0.3 | 18.2 | 18 | −17 | ||||
| Sr | 78.4 | 0.2 | 62.4 | 2 | −20 | ||||
| Ti* | 50.1 | 0.8 | ND | - | - | ||||
| Pb | 38.57 | 0.2 | 35.4 | 3 | −8 | ||||
| K* | 64 | 267 | 71 | 317 | |||||
| Rb | 31.4 | 0.4 | 29.4 | 3 | −6 | ||||
| SRM 2976 | Mussel Tissue | As | 13.3 | 1.8 | 13 | 4 | −4 | 5 | Between-day |
| Pb | 1.19 | 0.18 | 2 | 39 | 77 | ||||
| Br* | 329 | 289 | 3 | −12 | |||||
| Ca* | 7600 | 6055 | 9 | −20 | |||||
| Cl* | 57000 | 52184 | 5 | −8 | |||||
| Fe | 171 | 4.9 | 157 | 9 | −8 | ||||
| K* | 9700 | 7610 | 7 | −22 | |||||
| Mn* | 33 | 28 | 10 | −16 | |||||
| P* | 8300 | 7974 | 9 | −4 | |||||
| Rb* | 4.14 | 5 | 16 | 10 | |||||
| S* | 19000 | 14332 | 2 | −25 | |||||
| Se | 1.8 | 0.15 | 1 | 59 | −31 | ||||
| Sr* | 93 | 66 | 3 | −29 | |||||
| Zn | 137 | 13 | 137 | 6 | <1 | ||||
*
reference or informational value; ±U is the expanded uncertainty from the CRM certificate of analysis; PE=polyethylene