Magnetite containing 2.4 of Silica

Substantial uptake of the following inert-electrolyte ions has been reported  

Negligible uptake of Na at the PZC and negative adsorption below the PZC (radiotracer, 0.005, 0.016 M perchlorate) was reported in [1528]. 

The Na Cl ratio at a goethite surface was about 1, and it was rather insensitive to pH over die range 5-10 (XPS, 0.1 M NaCl) [1759]. 

Negative adsorption of Cl from 0.001 M NaCl and substantial uptake of Na from 0.001-0.1 M NaCl was found by a radiotracer method [1675]. 

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