Nitrogen in stone meteorites and terrestrial standards

摘要: Nitrogen contents have been determined by neutron activation method in stone meteorites and silicate standards. Leaching sieving experiments on standards indicate that contamination from atmospheric nitrogen is negligible. For BCR-1 nitrogen show a range 15 to 62ppm. The study includes 32 chondrites belonging various classes six achondrites. high C1 C2 chondrites (500 1,000ppm) E (100 - 500ppm). C3 group shows variable amounts of nitrogen. Ordinary similar (~30pm) irrespective their petrologic group. For all meteorites, chondrules lower compared the matrix. Dark phases some gas- rich are enriched as light counterparts. Non-magnetic portions have slightly excess N magnetic portions. Correlation with C, In, Bi, Tl, Zn Cd indicates presence two host for N.