Table 2.
Concentration of lead isotope solutions
| Soln | Sample No. | Wt soln | K2Cr2O7 Equivalent | Conc. soln Pb/g soln |
|---|---|---|---|---|
| g | mmol | mmol | ||
| Pb206 | A | 7.99061 | 1.131165 | 0.1415618 |
| B | 8.24170 | 1.166716 | .1415625 | |
| C | 8.00613 | 1.133361 | .1415617 | |
| D | 7.86875 | 1.113944 | .1415655 | |
| Average | a 0.1415629 | |||
| Pb208 | A | 8.42849 | 1.186636 | 0.1407887 |
| B | 7.85653 | 1.106099 | .1407872 | |
| C | 8.36411 | 1.177473 | .1407768 | |
| D | 8.27248 | 1.164649 | .1407860 | |
| Average | 0.1407847 |
a
The standard error of the average is calculated to be 0.00000405 mmol Pb/g soln and the uncertainty of the value of concentration at the 95 percent confidence level is 0.0000081 mmol Pb/g soln.