ULTRATRACE ANALYSIS OF URANIUM AND THORIUM IN GLASS .1. ICP-MS, CLASSICAL PHOTOMETRY AND CHELATE-GC

Three methods of determination for uranium and thorium traces and ultr atraces in glass were developed: a simple and powerful ICP-MS method e xhibiting limits of determination in the one ng/g-range; a complex met hod with end-determination by classical photometry and a limit of dete rmination for U and Th of 20 ng/g; and a method with chelate-complex f ormation for U and Th and subsequent GC-detection with a Ni-63-ECD wit h limits of determination in the mug/g-range. These methods are critic ally compared and tested for real type samples of special glasses.