APPLICATION OF THE INTERNAL STANDARD METHOD COUPLED WITH THE STANDARDADDITION METHOD IN PHOTON-ACTIVATION ANALYSIS TO TRACE CHARACTERIZATION OF ENVIRONMENTAL MATERIALS

The internal standard method coupled with the standard addition method has been applied to the analysis of environmental materials, such as urban particulate matter, vehicle exhaust particulates and coal fly as h by photon activation. High-resolution gamma-ray spectrometry makes p ossible to use multi-internal standard gamma-rays, in order to crossch eck the analytical results obtained from each internal standard. It wa s ascertained that this method can provide not only accurate analytica l results but also the information of homogeneity of samples, correlat ion of elements in the sample, loss or contamination in the preparatio n process.