TABLE 1.

Effects of sulfate concentrations on the formation of methane and the degradation of MT in various sediment slurries prepared from freshwater ditches at Zegveld, The Netherlands

Sample	SO42− (μM)	Formation rate (pmol/mg of organic matter · h−1)a
		Control		BES		Molybdate		BES + molybdate
		CH4	MT	CH4	MT	CH4	MT	CH4	MT
1	1,783	4.2	0	2.6	0	108	0	12	0.21
2	1,780	1.3	0	0.6	0	55	0	23	0.20
3	1,825	9.8	0	3.4	0	92	0	17	0.19
4	549	175	0	36.5	0.46	105	0	27	0.12

^aRates of methane and MT formation were calculated from time courses of duplicate bottles, with or without the addition of BES (25 mM), molybdate (20 mM), or BES (25 mM) plus molybdate (20 mM), and the formation rates are given in picomoles/milligram of organic matter · hour⁻¹.