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Rapid determination of a number of trace elements in zinc sulfate electrolyte is essential for adequate plant process control. As a basis for an on-stream monitoring system, differential pulse polarography and differential pulse anodic stripping voltammetry at a hanging drop mercury electrode have been investigated, using conventional and computercontrolled instrumentation, for the determination of Cd, Cu, Pb, Sb, Co, Ni, TI, and As. Cd and Cu were determined directly In the zinc sulfate solution down to 10 µg/l., and Sb to a similar low level after addition of concentrated hydrochloric acid. Pb, Co, Ni, Tl, and As were determined after addition of appropriate reagents in some cases; however, these determinations are generally better suited to higher concentration levels than for Cd, Cu, and Sb.Successful operation of electrolytic zinc plants depends critically on the purity of the cell feed, both for product purity and for high current efficiency in the deposition stage (1-4); therefore, reliable analytical data are very important to the economics of the process. Over the years, reasonable process control has existed (2, 5-9) by virtue of manual sampling and

ABSTRACT. A new sodium aluminium sulphate phosphate has been named peisleyite. It has the ideal formula NaaAla6(SO4)z(PO4ho(OH)I 7"20H20. It occurs as finegrained, compact, brittle, white material on dumps at Tom's Phosphate Quarry, near Kapunda, South Australia. Strongest X-ray diffraction lines are 12.63 A (100)

A process is described for the separation of rare earth clcments in monazite into the following products : (a) cerium group hydroxides containing thorium hydroxide, (b) crude thorium osalate. Quantitative aspects of the various methods used to accomplish the separations have been investigated. The process is suitable for large scale operation.

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