1993 COMPILATION OF DATA ON 5 BELGIAN SEDIMENTARY-ROCK REFERENCE MATERIALS - AWI-1, SBO-1, PRI-1, CCH-1 AND DWA-1

Five Belgian sedimentary rock reference materials have been prepared a nd distributed by the Geology, Petrology and Geochemistry Laboratory ( Liege University, Belgium). Thirty-six laboratories participated in th e international co-operative study. The individual data received from the participating laboratories are listed. Tables of compiled results are presented for major, minor and trace elements. These updated value s are summarized into means, associated standard deviations, medians, and concentration ranges. ''Recommended'' (or proposed) values are pre sented.