TABLE 2.

Physicochemical characteristics of spring water at the Nakabusa and Yumata sampling sites in Japan during this study

Sampling site	Date	Temp (°C)	Dissolved sulfide concn (mM)	Sulfate concn (mM)	pH
NS	July 2000	76	0.077 ± 0.020 (3)	NDa	8.5
	November 2000	72	0.123 (2)b	ND	8.8
	May 2001	76	0.046 (1)	0.204 (1)	8.7
	September 2001	76	0.087 ± 0.002 (3)	0.104 ± 0.038 (3)	8.8
	November 2001	77	0.278 ± 0.068 (3)	0.019 ± 0.007 (3)	8.6
	June 2002	77	0.112 ± 0.013 (3)	0.179 ± 0.009 (3)	8.4
YS1	August 2001	78	0.278 ± 0.068 (3)	0.081 ± 0.048 (3)	6.6
	August 2002	80	0.684 ± 0.050 (3)	0.076 (1)	6.3
YS2	August 2001	70	0.130 ± 0.013 (3)	0.130 ± 0.050 (3)	6.6
	August 2002	71	ND	ND	7.7

^aND, not determined.

^bThe numbers in parentheses are numbers of samples.