Table 4.
Determination of mass spectrometric bias
| Calibration sample No. | Isotopic ratio, Br79/Br81 | Correction factor (calc/M.S.) | |||
|---|---|---|---|---|---|
| Calc. | MS-1 | MS-4 | MS-1 | MS-4 | |
| Group I | |||||
| 1 | 1.03000 | 1.02970 | 1. 03035 | 1. 000301 | 0.999670 |
| 3 | 1.01972 | 1.02055 | 1. 02120 | 0.999197 | .998561 |
| 4 | 1.02666 | 1.02820 | 1.02865 | . 998512 | .998075 |
| 5 | 1.03992 | 1. 04105 | 1. 04125 | .998915 | .998723 |
| 6 | 1.00999 | 1.01175 | 1. 01235 | . 998270 | .997679 |
| Mean | .9990390 | .9985416 | |||
| Group II | |||||
| 1 | 0.99104 | 0.99115 | 0. 99270 | 0.999899 | 0. 998328 |
| 2 | 1.02982 | 1.02960 | 1. 03225 | 1. 000214 | .997646 |
| 3 | 1.02658 | 1. 02735 | 1. 02875 | 0. 999260 | .997900 |
| 4 | 1.02068 | 1.02125 | 1. 02270 | . 999442 | .998025 |
| 5 | 1.13256 | 1.13185 | 1.13425 | 1. 000627 | .998510 |
| 6 | 0. 94230 | 0.94185 | 0. 94355 | 1. 000478 | .998675 |
| Mean | . 9999866 | .9981807 | |||