Capacity of Diatomite to Sorb Cations in Various Salt Solutions
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Abstract
This investigation aimed to study the ability of diatomite to reduce the levels of various cations that might be found in salt-affected soils. To do so, the sorption capacity of diatomite to sorb the cations (Ca, Na, Fe, and K)
in solutions of their salts, such as NaCl, Na2SO4, CaCl2, CaSO4, KCl, K2SO4, FeCl3, and FeSO4, was studied using
a batch technique. Two diatomite samples and two diatomite-to-salt-solution ratios (i.e. 1:50 and 1:100) were studied. The results showed that diatomite has different capacities to sorb cations depending on the type of salts. Sodium was the element sorbed the most by diatomite, followed by calcium, and iron. In both NaCl and Na2SO4 solutions, diatomite could reduce the weight percentage of sodium in solution by more than 60%. It reduced calcium in CaSO4 solution by more than 80% but only 2-21% of calcium in CaCl2 solution. Diatomite was able to reduce
13-15% of iron in FeCl3 or FeSO4 solution. However, it was not able to remove potassium in KCl or K2SO4 solutions. This demonstrated that diatomite could efficiently sorb some cations in salt solutions and was especially efficient at sorbing sodium.
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King Mongkut's Agricultural Journal
References
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