| Temperature | 15° C. | 30° C. | 70° C. | 100° C. |
| "Uranium" required | 18.0 c.c. | 19.2 c.c. | 19.0 c.c. | 18.9 c.c. |
Effect of Varying Bulk.—
| Bulk | 50.0 c.c. | 100.0 c.c. | 200.0 c.c. | 300.0 c.c. |
| "Uranium" required | 18.8 " | 18.9 " | 19.0 " | 19.3 " |
Variation in bulk affects the results; therefore, a constant bulk should be adhered to.
Effect of Varying Sodium Acetate and Acetic Acid Solution.—
| Sodium acetate and acetic acid solution | 0.0 c.c. | 1.0 c.c. | 5.0 c.c. | 10.0 c.c. | 20.0 c.c. |
| "Uranium" required | 18.9 " | 18.9 " | 19.0 " | 18.8 " | 17.5 " |
As in the titration with arsenates, an excess is dangerous to the assay; a definite quantity (5 c.c.) should, therefore, be used.
Effect of Foreign Salts.—Besides the sodium acetate, &c., added, the only salts likely to be present are those of ammonia and magnesia. In three experiments, in one of which no foreign salts were introduced, while in the other two 5 grams of ammonic chloride and of magnesium sulphate respectively were added, there were required:—
| With ammonic chloride | 18.8 c.c. | "Uranium" solution |
| With magnesium sulphate | 19.0 " | " |
| Without foreign salts | 18.9 " | " |
Effect of Varying Phosphate.—