National Synchrotron Radiation Research Center 1 article published in JoVE Bioengineering Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples Tsung-Ting Shih*1, I-Hsiang Hsu*2, Ping-Hung Chen1, Shun-Niang Chen1, Sheng-Hao Tseng1, Ming-Jay Deng3, Yang-Wei Lin4, Yuh-Chang Sun1 1Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 2Center for Measurement Standards, Industrial Technology Research Institute, 3National Synchrotron Radiation Research Center, 4Department of Chemistry, National Changhua University of Education The fabrication protocol of a dipole-assisted solid phase extraction microchip for the trace metal analysis is presented.