『Abstract
　Perchlorate is a potent thyroid hormone-disrupting compound. Drinking water is one of the major sources of human exposure to perchlorate. Little is known about the occurrence of perchlorate in waters from China. In this study, water samples (n = 300) collected from 15 locations in 13 provinces and municipalities were analyzed for the presence of perchlorate. In addition, other inorganic anions that commonly occur in water - iodide, bromide, and nitrate - and the disinfection byproducts, bromate, chlorate, and chlorite were determined by high-performance liquid chromatography interfaced with tandem mass spectrometry. Perchlorate was detected in 86% of the samples analyzed, at concentrations ranging from <0.02 to 54.4μg l^-1 (mean±SD 2.30±6.39μg l^-1; median 0.62μg l^-1). Mean concentrations of perchlorate in tap water, groundwater, surface waters, and bottled water were 2.46, 3.04, 2.82, and 0.22μg l^-1, respectively. Significant positive correlations were found between the concentrations of perchlorate and nitrate, perchlorate and chlorate, bromide and iodide, and nitrate and iodide.』

（Introduction）
Materials and methods
　Sample collection
　Standards and reagents
　Sample preparation
　Instrumental analysis
　Quality assurance and quality control
Results and discussion
　Occurrence of perchlorate in waters from China
　Occurrence of chlorate, chlorite, bromate, bromide, nitrate, and iodide in waters from China
　Global comparison of perchlorate in waters
　Correlations among anions and source assessment
　Human exposure to perchlorate and other anions by way of water consumption
Conclusion
Acknowledgements
References