00705naa a2200169 a 450000100080000000500110000800800410001910000200006024500910008026000060017152002370017765000130041465300400042765300090046770000210047677300380049710291882010-08-24               bl ---       0--  u    #d1 aCRUVINEL, P. E.  aDetermination of Se in soil samples using the proton onduced X-ray emission technique.  c0  aAn alternative method for the direct determination of total Se in soil samples is presented. A large number of trace elements is present in soil at concentration values in the range of part per bilion and tenths of parts of million.  aselenium  aAtomic absorption spectrophotometry  aPIXE1 aFLOCCHINI, R. G.  tNuclear Instruments and Methods B