ῒ῔  /+  (,**0) ,  +-/ῌ+.* ΐ ῕  !"#$      ,**/  .  +,   ,**0  -  +2  Determination of Concentration of Total Sulfur Species and Estimation of Concentrationof 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 theKusatsu-Shirane volcano, collected between +300 and +33/. One analytical method was ion chromatograph, bywhich concentrations of the sulfate ion (SO., ) were determined. The other was gravimetric analysis precededby 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,.

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nE[\3])ByzE[\3G$`_JU{;vstuh|;i}="~)E[+331G \# Takano`_;JU{,vstuh|;}="~V¯°+*,ῌ2//. %&±²³´µ$¶ 1ῌ+!" '"="·Department of Chemistry, Faculty of Science andTechnology, Sophia University, 1ῌ+ Kioicho, Chiyoda,
Tokyo +*,ῌ2//., Japan.
%&'("%&¸¹°+/,ῌ**+, %&±'º´»¼ ,ῌ/ῌ1Professor emeritus of Tokyo Institute of Technology,,ῌ/ῌ1 Senzoku, Megro, Tokyo +/,ῌ**+,, Japan.

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Corresponding author : Yoshikazu Kikawada
e-mail : y-kikawa@sophia.ac.jp

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136

Fig. +.

A map around the Yugama crater lake and the sampling location (°) of water samples.

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137

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(this work ; ion chromatograph) ; ª, T-SO.,©
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Table ,. Comparison of the concentration of SO.,© and T-SO.,© in mg dm©between our analytical values and the values cited from Takano andWatanuki (+33*) of the sample waters collected on the same date.

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Table .. Comparison of the determined values of T-SO., in Yugama
water samples between the gravimetric analysis and ICP-AES.

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ῐ ῕ ῔ ῑKikawada, Y., Fukuhara, H., Kikawa, N., Oi, T. andOssaka, 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 withsulfur 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.
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