Part I. Application of pulse polarography and pulse anodic stripping to the determination of selected heavy metals in natural waters. Part II. Application of controlled potential coulometric techniques to the determination of uranium
The use of a thin mercury film wax-impregnated graphite electrode for the simultaneous determination of cadmium, lead and zinc in an acetate buffer by differential pulse anodic stripping voltammetry is described. Optimal instrumental parameters for maximum resolution and sensitivity for simultaneous analysis of these three elements in natural waters are discussed. The interference of copper with the determination of zinc is investigated in detail. An optimal mercury film thickness for this electrode is suggested. A method utilizing differential pulse polarography for the determination of chromium (VI) in natural water is described. Additions of 0.62 ..mu..g Cu(II) ml/sup -1/ and 0.55 ..mu..g Fe(III) ml/sup -1/ did not interfere with the determination of 0.050 ..mu..g Cr(VI) ml/sup -1/. The natural water samples containing Cr(VI) were buffered to approximately pH 7 with 0.1 M ammonium acetate and 0.005 M ethylenediamine and analyzed. Natural water samples of chromium from 0.035 ..mu..g to 2.0 ..mu..g.ml/sup -1/ may be analyzed directly without further preparation. The detection limit is 0.010 ..mu..g.ml/sup -1/. A novel, highly efficient cell with integral stirrer for controlled potential coulometry is described. This cell was used to demonstrate the feasibility of determining uranium (VI) by predictive coulometry. A PDP 8/I minicomputer was used to predict the coulometric endpoint with high accuracy within 2.5 minutes in a titration which normally takes about 10 minutes. This technique was shown to yield acceptable results even in the presence of an interfering phosphate matrix.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7094844
- Report Number(s):
- TID-27709; TRN: 77-017573
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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