1. Associate Professor, Dept. of Earth and Environmental Sciences, National Chung Cheng Univ., 168 University Rd., Min-Hsiung, Chiayi, Taiwan, R.O.C. (corresponding author). E-mail: bmhsu@eq.ccu.edu.tw
2. Assistant Professor, Dept. of Safety, Health and Environmental Engineering, National Kaohsiung First Univ. of Science and Technology, Kaohsiung, Taiwan, R.O.C.
3. Research Fellow, National Institute of Environmental Analysis, Environmental Protection Administration, Chung-Li, Taiwan, R.O.C.
4. Instructor, Dept. of Environmental Engineering and Health, Yuanpei Univ. of Science and Technology, Hsinchu, Taiwan, R.O.C.