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As the aim of this study was separation and extraction of magnesium ion from seawater and RO brine, the selectivity of the BLM system was evaluated by Mg2+ transport studies in the presence of Ca2+ (450 mg/L), Na+ (13,680 mg/L), and K+ (800 mg/L) ions in the feed solution close to the reported concentration of these ions in seawater. Table 4 shows the percentage transport of Mg2+ (0.059 M) and these cations into the receiving phase. As is observed, in the absence of any masking agents, the interfering effects of these foreign metals ions are low.

Table 4

Selectivity study of BLM transport of Mg2+ in several interference mixture simulated seawater

No.Mixture% Transported into receiving phase
Mg2+ 98 
 Ca2+ nd 
Mg2+ 98 
 Na+ 7.8 
Mg2+ 98 
 K+ 2.1 
Mg2+ 97 
 Ca2+ nd 
 Na+ 8.3 
 K+ 3.7 
No.Mixture% Transported into receiving phase
Mg2+ 98 
 Ca2+ nd 
Mg2+ 98 
 Na+ 7.8 
Mg2+ 98 
 K+ 2.1 
Mg2+ 97 
 Ca2+ nd 
 Na+ 8.3 
 K+ 3.7 

Experiment conditions: [Mg+2] = 0.059 M; membrane = 0.001 M of 18 crown 6 in chloroform; [Cl] = 0.01 M; feed pH = 3.3; stripping reagent = 0.1 M of SCN; pH of the receiving solution = 3; extraction time = 2.5 hr. nd: not detected.

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