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Effects of environmental regulations on heavy metal pollution decline in core sediments from Manila Bay |
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| Authors: | Takahiro Hosono Chih-Chieh Su Atsuko Amano |
| Institution: | a Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan b Institute of Oceanography, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan c Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines d Institute of Geoscience and Geoinformation, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8561, Japan e Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8521, Japan |
| Abstract: | We investigated the high-resolution heavy metal pollution history of Manila Bay using heavy metal concentrations and Pb isotope ratios together with 210Pb dating to find out the effects of environmental regulations after the 1990s. Our results suggested that the rate of decline in heavy metal pollution increased dramatically from the end of the 1990s due to stricter environmental regulations, Administrative Order No. 42, being enforced by the Philippines government. The presented data and methodology should form the basis for future monitoring, leading to pollution control, and to the generation of preventive measures at the pollution source for the maintenance of environmental quality in the coastal metropolitan city of Manila. Although this is the first report of a reduction in pollution in Asian developing country, our results suggest that we can expect to find similar signs of pollution decline in other parts of the world as well. |
| Keywords: | Manila Bay Core sediments Heavy metal polution Pb isotope ratio |
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