Potassium
| Analyt: | Potassium |
| Matrix: | Serum, Urine |
| Measuring Method: | Magnetic sector field ICP-ID/MS |
| Standard: | KCl NIST 918c |
| Internal Standard: | Isotopically enriched K-41 |
| Sample Processing: | Samples are spiked gravimetrically with internal standard and diluted approx. 100-fold with 4mM nitric acid. |
| Measurement: | Measurement at m/z 38.964 and m/z 40.962, high resolution mode to eliminate polyatomic interferences |