Modeling of Cd speciation in salinised water resources used for irrigation | Modeliranje specijacije Cd u saliniziranim vodnim resursima korištenim za navodnjavanje
2012
Ondrašek, G., Agronomski fakultet, Zagreb (Croatia) | Savić, R., Poljoprivredni fakultet, Novi Sad (Serbia) | Maurović, N., Agronomski fakultet, Zagreb (Croatia) | Kondres, N., Agronomski fakultet, Zagreb (Croatia) | Burić, N., Agronomski fakultet, Zagreb (Croatia)
By modeling approach (Visual MINTEQ) was evaluated biogeochemistry of Cd-contaminated (1 micro M) sollution with different salinity levels (Na+ 15-150, Cl- 12-90 and SO4 2- 1.5-30 mM) in a wide pH (3.5-9.5) range and low presence of dissolved organic C (1 mg/L). According to results concentration of free Cd 2+ predominated in most of tested pH range under low salinity, whereas in medium-high salinity treatments prevailed concentrations of Cd-Cl and Cd-SO4 pool. The NICA-Donnan modeling confirmed the importance of organically-complexed Cd only under higher pHs (greater than 8.0) and low salinity. Results show that as a consequence of diminished dissolved organic pool under excessive salinity Cd biogeochamistry in the rhizosphere can be affected in a way that would enhance its solubility/phytoaccumulation into the food crops.
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