島根大学地質学研究報告

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島根大学地質学研究報告 10
1991-07-30 発行

空気燃焼法によるケロジェンイオウ濃度の測定

Measurement of kerogen sulphur concentration by combustion method in air
市場 健二
鈴木 徳行
ファイル
内容記述(抄録等)
Determination of total sulphur concentration of kerogen by combustion method in air is examined. The combustion of sample was carried out at 950℃ for 10 min under flowing air of 2500 ml/min. Most sulphurs in sample are oxidized to be SO_2 by combustion. The sulphur dioxide is further trapped by H_2O_2 solution (ca. 3.0%) and reacted with H_2O_2 to be H_2SO_4. The determination of [SO^(2-)_4] in H_2O_2 solution by ion chromatograph and pH meter are examined, respectively. The direct determination of [SO^(2-)_4]by ion chromatograph is one of the most useful and precise analytical methods. While, the determination of [SO^(2-)_4] by pH meter ls based on the possible liner relationship between [H^+] and [SO^(2-)_4] in H_2O_2 solution. Kerogen samples often contain significant amount of halogen anions such as Cl^- and F^- because HCl and HF are generally used for the kerogen extraction. Another halogen anion, Br^-, can be significantly present in kerogen sample when we adopt ZnBr_2 solution as heavy liquid to separate neoformed fluorides and silicate minerals from HF/HCl treated samples. Those halogen anions can induce significant H^+ and obstruct the determination of [SO^(2-)_4]. However, results of [SO^(2-)_4] determination by pH meter for sufficiently washed kerogens are consistent well with ones by ion chromatography. If we sufficiently remove those halogen anions from kerogen samples, the indirect measurement of [SO^(2-)_4] by pH meter can be a fast and useful method to determine kerogen sulphur concentration.
NCID
AN00054980