Abstract

The total dissolved solids (TDS) is a parameter considered for different agencies and organizations. The TDS is typically determined by the ionic strength (I). The magnesium sulfate heptahydrate is an electrolyte that produces SO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2−</sup> and CaCO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> in water and changes its ionic strength. The elimination of therapeutic agents, beverages and other domestic products not used at home, which contain magnesium sulfate heptahydrate, and the agricultural use of fertilizers are sources of magnesium sulfate heptahydrate in the environment. In this work, the complex relative permittivity of liquid samples with different ionic strength levels due to magnesium sulfate heptahydrate dissolved in water is presented. The study covers an ionic strength range from 0 M to 10.553 M. The measurements are performed with an open coaxial probe in a range from 500 MHz to 20 GHz and the Havriliak-Negami model parameters are presented for the different samples. The dielectric constant does not exhibit as high change as loss factor in relation to ionic strength. The loss factor at 500 MHz is used to determine the ionic strength due to magnesium sulfate heptahydrate. The fitting curve shows a second-grade polynomial whose ionic strength goes from 0.0008 M to 8.1179 M and the loss factor at 500 MHz goes from 2.4 to 213.82. Therefore, the open coaxial probe can be used for measuring a wide ionic strength range.

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