A voltammetric investigation of Au assay was conducted at a low cost, using Nafion and DNA immobilized on a graphite Pencil working electrode (NDP) with a black lead counter and reference. The following optimal parameters were found: 0.4 V amplitude, 500 Hz frequency, -0.7 V initial potential, and 0.015 V increment potential. These optimal conditions were also applied to sand obtained from the river site. The aforementioned technique is simpler and less costly compared to the common voltammetry and spectrophotometric methods.

• Nack-Joo Kim(Dept. of Fine Chemistry, Seoul National Univ. of Science & Technology) Corresponding author
• Dal-Woong Choi(Department of Public Health Sciences, Graduate School, Korea University)
• Hai-Soo Yoo(Korea Institute Ocean Science Technology, 787 Haean ro(st))
• Kyung Lee(Excavation Literature and Ancient Scripts Research Institute, Fudan University)
• Chang-Hyun Lee(Division of General Education, Pyeongtaek University)
• Suw-Young Ly(Biosensor Research Institute)
• Tae-Yun Kim(Biosensor Research Institute)