A newly-developed method is reported for direct determination of fluorine in silicate rocks and minerals rising a fluorine icn-selective electrvde. Some require
Some soft and mud samples have been determined for eadmiun, lead, copper,nickel and cobalt by atomic absorption speetrophotometry with a high-temperature graphi
Distributional characteristics of trace elements (V,Co,Ni, Cu,Pb,Cr,Sr,Ra) have been examined in sedimentary rocks of various ages in Turfan, an intermountainou