IMPROVED APPARATUS FOR MICRO-ELECTROANALYSIS¹

Microchemical Analysis of Sphalerite from Kristineberg, Sweden

“…Attempts to determine the zinc by precipitation as sulfide (9) were unsuccessful; zinc added to the solutions of corrosionresistant steels was not recovered. Sulfide precipitates were obtained, filtered, and ignited, but purification of the residue by mercuric thiocyanate gave erratic results and in some instances yielded no precipitate.…”

“…An electrolytic micromethod for the determination of 0.01% of lead in zinc has been described by Clarke and Hermance(9). b Low figures in parentheses explained by incomplete oxidation of sulfur.Table VII.…”

An Efficient Vacuum Pump Check Valve

“…Teachers of microanalysis should impress upon their students that the operations of sampling and preparation in industrial micrurgy frequently require more time and skill than micro chemical tests proper. 4. Finally, the authors would urge manufacturing engineers and research directors to adopt a more critical attitude towards analytical results.…”

Determination of Indium by Micromethods

“…The electrodeposition cells of Pregl (14) and Clarke and Hermanee (5) were used for the microelectrodeposition. Pregl's cell has several disadvantages (5) and except for a few preliminary experiments, the cells of Clarke and Hermanee were used.…”