Determination of fluorine in silicate rocks using a fluoride ion electrode and the applications

NISHIDA Kazuhiro, YAMAMOTO Shin-ichi, IMAOKA Teruyoshi, KANO Takashi, OWADA Masaaki

doi:10.15080/agcjchikyukagaku.56.1_27

Bibliographic Information

Other Title

デジタルイオンメーターを用いた珪酸塩岩中のフッ素の定量方法とその応用例
デジタルイオンメーターオモチイタケイサンガンセキチュウノフッソノテイリョウホウホウトソノオウヨウレイ
デジタルイオンメーターオモチイタケイサンエンガンチュウノフッソノテイリョウホウホウトソノオウヨウレイ

Search this article

Abstract

Fluorine determination in silicate rocks has been conducted without separation of aluminum using an Orion Model 290A fluoride ion electrode. The sample was fused with zinc oxide and sodium carbonate in an electric furnace, maintaining a temperature of 900℃ for 30 minutes. The cooled cake was dissolved with distilled water in the Pt crucibles on hot plate for 2 hours until the cakes soften. Analyses were made using 0.2 M sodium citrate - 0.2 M potassium nitrate solution as a buffer. The method was applied to several GSJ, USGS and SABS geochemical reference samples. The analytical values of the geochemical reference samples were compared with the reported values. They show good agreement with the recommended values. Using this method, whole rock samples from the Aravalli Belt, the Eastern Ghats Belt, the Kerala Khondalite Belt, India and from the Sφr Rondane Mefjell granitoids complex, East Antractica were analyzed. Fluorine contents and Ga/A1 ratio in incipient charnockites of the Kerala Khondalite Belt are higher than those in the surrounding gneisses.

Journal

Earth Science (Chikyu Kagaku)

Earth Science (Chikyu Kagaku) 56 (1), 27-34, 2002

The Association for the Geological Collaboration in Japan

Keywords

Details 詳細情報について

Export