Brendel, P. J., & Luther, G. W. I. (1995). Development of a Gold Amalgam Voltammetric Microelectrode for the Determination of Dissolved Fe, Mn, O2, and S(-II) in Porewaters of Marine and Freshwater Sediments. Environmental Science & Technology, 29(3), 751–761. doi:10.1021/es00003a024