バッチ法に基づく変質火山岩からのヒ素溶出挙動

概要

論文の詳細を見る
Hydrothermally altered rocks are rich in arsenic (As). Thus the leaching of As from the rocks as muck may affect the surrounding soil and groundwater. The objective of this study is to clarify the leaching behavior of As for eleven crushed rock samples collected in Hokkaido by batch leaching experiments. The results showed that the As concentration in the leachate correlated with the As and sulfur (S) contents in rock and the SO42- and Fe concentrations in leachate, and that pyrite was detected in the rock samples that contained more sulfur. The As was also observed in the pyrite grain of the rock samples by SEM-EDX. This suggests that the mechanism of As release from altered igneous rocks used in the present work is partly explained by the congruent dissolution with pyrite that contains As as impurities. The higher correlation between As concentration in the leachate and As content in the rock means that the As content is used as an effective indicator of the necessity of leaching experiments.
社団法人資源・素材学会の論文