Using Rare Earth Elements and Lead Isotopes as Tracers of Technology Industry Wastewater in Keya Creek, Hsinchu, Taiwan

• Main Authors: HUANG, CHUNG-YEN, 黃種彥
• Other Authors: LU, HSUEH-YU
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/dbuy83

碩士 === 國立中正大學 === 地球與環境科學研究所 === 107 === Semiconductor industry is highly developed in Taiwan. Hsinchu Science Park (HSP), the first foundry, was established in 1980. High-tech factories such as semiconductor and optoelectronics manufacturing are gathered in the park. The wastewater treatment plant (WWTP) in the park was constructed and has run its operation since 1986. The treated wastewater from multiple sources is being discharged into Keya Creek watershed. This study analyzes water chemistry characteristics of Keya Creek and its tributary and intends to use rare earth elements (REEs) and lead isotopes to characterize the water from different sources. The elements concentration and lead isotopes were determined using Q-ICP-MS. The results demonstrate that several heavy metals (Cu, Zn, Ni and W) increases from effluent to downstream. The principal component analysis can categorize two end components, including the uncontaminated upstream water and effluents from HSP. After normalized by REEs of North American shale composite (NASC), all water samples show heavy REE enriched pattern, which indicate a strong adsorption process during the transportation in the watershed. However, the effluent water from HSP is characterized with a predominant Ce positive anomaly while the others, on the contrary, show a slight Ce negative anomaly. In addition, Gd positive anomaly can be observed in some samples. The lead isotopes (207Pb/206Pb vs. 208Pb/206Pb) of effluent water present a distinct mixing trend, which has an opposite slope to that of upstream water. These confirm that REEs and lead isotopes can be excellent indicators for wastewater from semiconductor industry.