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Tzollas, N. M., Zachariadis, G. A., Anthemidis, A. N., & Stratis, J. A. (2010). A new approach to indophenol blue method for determination of ammonium in geothermal waters with high mineral content. International Journal of Environmental and Analytical Chemistry, 90(2), 115-126.

Amornthammarong, N., Zhang, J. Z., Ortner, P. B., Stamates, J., Shoemaker, M., & Kindel, M. W. (2013). A portable analyser for the measurement of ammonium in marine waters. Environ. Sci.: Processes Impacts, 15(3), 579-584.
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