Simultaneous preconcentration and penta-elemental speciation analysis of Cr, As, Cd, Hg, and Pb by online solid-phase extraction and high-performance liquid chromatography–inductively coupled plasma mass spectrometry

• Pingxiu ZengHangzhou Normal University
• Zhenzhen MaHangzhou Normal University
• Hongmei HuZhejiang Marine Fisheries Research Institute
• Meiying YeHangzhou Normal University
• Yuanchao WangHangzhou Normal University
• Heyong ChengHangzhou Normal University