A simple automatic recording sedimentation balance utilizes a sensitive spring to weigh the particles settled on the pan. As the weight on the pan changes, a shutter mechanism intercepts parallel light reaching a photocell. The resulting change in photocell current is recorded automatically by means
An improved method for the determination of milligram quantities of vanadium in the presence of uranium is described. Use of a modified dead-stop procedure and a weight microburet increases the sensitivity and precision of the method.Results are given in the range of 0.10 to 4.0 mg. of vanadium.
Wave length, 655 µ Slit width, 0.130 mm.Cell, 1-cm. Composition of final solution: Indicated volume of standard solution of KTcO< (0.207 mg. of Tc(VII)/ml.); 1.0 ml. of 10% v./v. thioglycolic acid solution of pH 8.0 ± 0.2; 1.0 ml. of 1M sodium acetate solution; and water, to make a total volume of 5.0 ml.
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