1. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia;
2. Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata, Japan;
3. Department of Geography, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar, Makassar, Indonesia;
4. Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar, Makassar, Indonesia