1Krouse H R, Grinenko V A. Stable isotopes: natural and anthropo- genic sulfur in the environment [M]. New York: John Wiley and Sons Ltd, 1991:1 -440.
2Tuttle M L W, Breit G N, Cozzarelli I M. Processes affecting δ^34S and δ^18O values of dissolved sulfate in alluvium along the Canadian Rivers, central Oklahoma, USA[J]. Chemical Geology, 2009, 265 (3/4) :455 -467.
3Bottell S, Tellam J, Bartlett R, et al. Isotopic composition of sulfate as a tracer of natural and anthropogenic influences on groundwater ge- ochemistry in an urban sandstone aquifer, Birmingham, UK[J]. Ap- plied Geochemistry, 2008, 23 ( 8 ) :2382 - 2398.
4Ezierski P, Szynkiewicz A, Jedrysek M O, Natural and anthropogenic origin sulphate in an mountainous groundwater system: S and O iso- tope evidences[J]. Water, Air, and Soil Pollution, 2006, 173( 1/ 2/3/4) :81 - 101.