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The main objective of this study is identification of the best conditions for magnesium separation from seawater and reversed osmosis (RO) brine. Organic solvents have an important role in BLM transport (Ajwani et al. 2012). According to the high concentration of magnesium ions in these samples and in order to prevent evaporation of the solvent, the organic phase with a higher density was selected. The organic phase should include features such as low volatility and viscosity, suitable dielectric constant, polarity and also the ability for a good exchange phase with high distribution coefficient (Zidi et al. 2011). Therefore, several heavy solvents, such as dichloromethane, chloroform, and carbon tetrachloride were tested. Results of this study are shown in Table 1. It appears that suitable dielectric constant and polarization ability of chloroform leads to better behavior in magnesium transport than other solvents. Extraction percent (%E) and stripping (%S) are calculated from the following formulas (Fakhari et al. 2006):
formula
where, C0f, Cf are initial and final concentration of Mg2+ in the feed phase and CR is concentration of Mg2+ in the receiving phase after the transport process.
Table 1

Effect of membrane solvent type on transport procedure

%ESolvent
16.95 Dichloromethane 
20.34 Chloroform 
8.47 Carbon tetrachloride 
%ESolvent
16.95 Dichloromethane 
20.34 Chloroform 
8.47 Carbon tetrachloride 

Experiment conditions: [Mg+2] = 0.059 M; temperature = 25 °C; feed pH = 4; stripping reagent = 0.1 M of SCN; pH of the receiving solution = 3; extraction time = 2 hr.

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