No abstract

ABSTRACT'^^IV:A description is given of the preparation and properties of a granular form of potassium hexacyanocobalt(II)ferrate(II) that is a highly selective absorbent for cesium ion. The material is suitable for use in a large-scale ion exchange column, and offers 137 the possibility of isolating and concentrating Cs from the fission product waste solutions which arise from the processing of nuclear fuels. Facsimile Price $This paper was submitted for publication in the open literature at least^ months prior to the issuance date of this Microcard. Since the U.S.A.E.C. has no evidence that it has been published, the paper is being distributed in Microcard form as a preprint.

A description is given of the preparation and properties of a granular form of potassium hexacyanocobalt(II)ferrate(II) that is a highly selective absorbent for cesium ion. The material is suitable for use in a large-scale ion exchange column, and offers 137 the possibility of isolating and concentrating Cs from the fission product waste solutions which arise from the processing of nuclear fuels.

No abstract

Here are reported the design and calibration of a new inexpensive free-flow electroviscolneter for rapid and accurate measurement of the viscosity coefiicients for conducting and nonconducting solutions. Flow tilnes of 30 seconds are easily reproduced to within 0.02 second. INTRODUCTIONIn the past, several comprehensive review articles about viscometers have been published (1-5). An automatic visco~neter designed t o measure flow tiines accurately without constant attention by the operator has been reported by Goldfinger and Greatbatch (6). This viscoineter used a photoelectrically triggered timing device to measure flow times to within 1 part in 10,000. Stock (7) has designed an electric resistance stream gauge type viscometer.Measurements with free-flow type viscometers are limited in accuracy by the response time of the observer and the flow time of the viscometer. Rotary cone and the GoldfingerGreatbatch types are relatively expei~sive and create problems where temperature control is desired.Here is described a new modification of the Ostwald-Fenslte viscometer which can be immersed in the usual therinostated bath. Even the low flow times, less than 30 seconds, are measured electronically to better than 1 part in 1000. DESCRII'TION O F APPARATUSElectrodes of No. 24 gauge platinum were sealed into an Ostwald-Fenske viscometer a t the locations shown in Fig. 1. Platinum-to-glass or Hysol cement seals are satisfactory. Special care should be taken to locate the lowest electrode (No. 3) away from the capillary entrance. The top two electrodes (Nos. 1 and 2) are located centrally to ininimize holdback of the solution. Lead wires are soldered to the three electrodes and then are coated with Dupont Duco cement for electrical insulation. Cover assemblies were cut from solid Plexiglass and were cemented directly onto the viscoineter with Dupont Duco cement. These cover assemblies fit into openings in the lid of the Precision Temp-trol kinematic viscosity bath (Precision Scientific Company, Chicago, Illinois), and thus correct positioning of the viscometer is assured a t all times.Two Model 30 Fisher transistor relays (Fisher Scientific Company, New York, N.Y.) were connected to the platinum electrodes on the viscometer (Fig. 2) through variable resistances (0 to 0.50 meg) and to a Precision Time-it timer (Precision Scientific Coinpany, Chicago, Illinois) graduated in 1/10 seconds. Viscosity measurements a t constant, desired temperatures were achieved by placing the viscoineters in the Temp-trol kinematic viscosity bath or in a similar laboratory-constructed unit. OPERATION AND CALIBR4TIONMethanol -carbon tetrachloride solutions of SnC14.5Hp0 and n~ethanol solutions of iron group metal chlorides were used in the calibration of the modified Ostwald-Fenske