By intensity measurements of the uranium and plutoniumLα1-lines these elements can be determined simultaneously either in aqueous or in organic Purex process solutions. Thorium was
used as an internal standard. The sensitivity of the method is about 105 cpm/mg U, Pu/ml and the detection limits are around 2–3 μg U, Pu/ml. The analytical range extends from 0.003 mg U, Pu/ml
up to 10 mg U, Pu/ml. A time-saving routine procedure is described. Interferences detected at extreme U/Pu concentration ratios
are discussed and explained.
Nowadays the PUREX process is the sole accepted reprocessing technique. Its boundary conditions change all the time: former
metallic low burnup fuels have been replaced by present ceramic oxide fuels with high burnups, and tomorrow fast breeder fuels
with high plutonium contents will have to be processed. In addition, more and more restrictive conditions are being imposed
upon waste treatment and more and more stringent safety regulations are being felt. Within these constraints this report presents
a survey of the results of recent developments in process technology and gives some reference to the importance of process
analytical statements with respect to plant operation. Moreover, recommendations are made for the installation and design
of analytical laboratories and some experiences are communicated in the field of process analytical chemistry.
Authors:D. Ertel, P. Groll, G. Knittel, and W. Thessis
PUREX process analytical chemistry is to generate information about the actual chemical state of the procedure. This originates
mainly from current analytical investigations of appropriate solution samples. A lot of special arrangements, analytical equipment
and methods and, last not least, experience is necessary. This paper reviews the problems in the field and describes a conception
of process analytical chemistry with respect to an experimentally orientated situation.