Procedures rapid water exchange

Aliquots of fission product solution with added known amounts of cesium and strontium were passed through a column of Amberlite IRA-400 (OH) and eluted with several column volumes of water. The strontium and cesium in the eluate were separated from each other by the oxalate and perchlorate precipitation method. By this means, the determinations of these two elements were accomplished rapidly and with good precision. By using an anion exchange column in the carbonate form, only cesium in fission products can be eluted (186,271). This type of separation should have. application to rapid procedures. ... 

T(he increasing development and use of insecticides and other pesticides constitute a growing hazard for contaminating our water supplies. To keep pace with the use (5,6) of these toxicants, more information is needed on distribution, transport, exchange mechanism, degradation products, and metabolites of these substances. Thus, convenient and sensitive methods of analysis are essential to the success of research in this field. Furthermore, pesticide levels in water can be monitored more accurately by improved analytical techniques. Accurate and rapid procedures are especially needed when prompt information or action is necessary. Even when low concentrations of pesticides do not show immediate adverse effects, detrimental results may eventually occur, since it has been observed that a number of these toxicants are concentrated in a variety of aquatic plants and animals. 

Another approach to resolve this issue is to preconcentrate the sample dissolved in 100% organic solvent on an anion-exchange concentrator column and then eliminate the matrix with deionized water prior to analysis. This procedure was successfully used to determine anionic impurities in a proprietary pharmaceutical compound with limited water solubility [454]. An lonPac AS15 column was chosen as the separator column, because it is a high-capacity column specifically developed for the rapid and efficient separation of trace inorganic anions in matrices with varying ionic strength. 

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