草津白根山火口湖''湯釜'における全硫黄化学種濃度の定量とポリチオン酸イオン溶存量の推定
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(3) . . ,**/ . +, ,**0 - +2 . Determination of Concentration of Total Sulfur Species and Estimation of Concentration of Poly-thionate Ions in Yugama, a Crater Lake of Kusatsu-Shirane Volcano Yoshikazu KIKAWADA῍, Hideki FUKUHARA῍, Sawako NOMURA῍, Noriko KIKAWA῍, Aya INOUE῍, Takao OI῍ and Joyo OSSAKA῍῍ We compared two analytical values for sulfur species in water samples of Yugama, a crater lake of the Kusatsu-Shirane volcano, collected between +300 and +33/. One analytical method was ion chromatograph, by which concentrations of the sulfate ion (SO., ) were determined. The other was gravimetric analysis preceded by oxidation of the samples, by which total concentrations of sulfur species (T-SO., ) were determined. The concentration di#erences between the two were in good accordance with the total concentration of poly-thionates reported by Takano and Watanuki (+33*) through the whole period studied. This suggested that the concentration di#erence between SO., and T-SO., can be used to estimate the concentrations of dissolved poly-thionates. In this way we can grasp very easily the secular change of the total concentration of poly-thionates without any special analytical conditions and/or instruments. Key words : Kusatsu-Shirane volcano, crater lake, poly-thionates, sulfur species. +ῌ ῐ ῎ ῑ ῏. and Watanuki (+33*) ,c\[;l=B,. !"#$%&'(")*+# +30/ ,-
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(25) +300 1J Fig. ,. The experimental procedure for determination of total concentration of sulfur species (T-SO.,o).. DEy 0,*** mg dmo- HWpA& 6 .. "IBz NBC9:;2Q `{.. Table +. The analytical values of the concentration of sulfate ion (SO.,o) and the total concentration of sulfur species (T-SO.,o) in mg dmo-..
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(60) LMNBC:AB C 5OU#t1+ "g3>"23-# ΐ. ῒ. *uv5w7 - " x45k 6y* # +300. 5GiU ῐ ῑ Kikawada, Y., Fukuhara, H., Kikawa, N., Oi, T. and Ossaka, J. (,**.) Concentrations of dissolved sulfate ion and total sulfur in Yugama, a crater lake of the KusatsuShirane volcano, Japan. Geochim. Cosmochim. Acta, 02, Supplement +, A,/1. H n ¡ I J ¢ £¤KL (+3/,) 9: ;K ¥J¦ § " M9¨ +0 +ῌ/. ©ª«N ©ªO¬ PQn 5®RS 5¯ T ,x U°V±n ,WXY Z®²[ \³ ´ (+331) µ]¡9:;¶K ?J@ 9·F ; ¸^ %j;k -+ ++3ῌ+,2. Pasternack, G. B. and Varekamp, J. C. (+331) Volcanic lake systematics I. Physical constraints. Bull. Volcanol., /2, /,2ῌ/-2. Takano, B. (+321) Correlation of volcanic activity with sulfur oxyanion speciation in a crater lake. Science, ,-/, +0--ῌ+0-/. Takano, B. and Watanuki, K. (+33*) Monitoring of volcanic eruptions at Yugama crater lake by aqueous sulfur oxyanions. J. Volcanol. Geotherm. Res., .*, 1+ῌ21. ¹A_( ,xº.
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