1. Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, Taichung 402, Taiwan
2. Yenepoya Research Centre, Yenepoya University, Deralakatte, Mangalore, Karnataka State, India
3. Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan
4. Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan