Table 3.
Experimental parameters for LA-ICP-MS
| Assay and parametera | Value |
|---|---|
| Laser ablation system | |
| Wavelength of Nd:YAG laser (nm) | 200 |
| Laser spot size (μm) | 100 |
| Distance between lines (μm) | 10 |
| Laser energy (%) | 50 |
| Laser shot frequency (Hz) | 20 |
| Scan rate (μm/s) | 20 |
| ICP-MS | |
| RF power (W) | 1,250 |
| Cool gas (Ar) (liters min−1) | 16.00 |
| Auxiliary gas (Ar) (liters min−1) | 0.8 |
| Sample gas (Ar) (liters min−1) | 1.0 |
| Resolution mode | Medium (4,300) |
| Isotopes measured | 44Ca, 55Mn, 66Zn |
| Samples per peak (no.) | 20 |
a
The laser ablation system used was LSX-213, CETAC. For ICP-MS, an Element 2 device (Thermo Fisher Scientific) was used.