The Phytotoxicity And Concentration Prediction Models Of Soil Soluble Cu And Ni

In the present study, bioassays of barley root elongation, tomato shoot and bokchoy were performed in17representive Chinese soils with added Cu/Ni salts, whichhad or had not undergone a leaching treatment. The effect of leaching on soluble Cuand Nitoxicitywas investigated and empirical relationships between soil pore waterproperties and soluble Cu and Ni toxicity were developed, meanwhile the mainfactors in pore water influencing soluble metal phytotoxicity were alsodetermined.The solid-solution partitioning model of Cu and Ni were developed basedoncompetition and adsorption modelin three pH ranges of soils (pH <7,7<pH <8and pH>8) through multiple regression between soil properties and soil metalcontents, which could provided precise predictions of soil soluble metalconcentrations.Additionally, the whole soil speciation including bulk of soilsproperties and total soils Ni or Cu contents were analyzed by mechanic speciationmodels WHAM VI and Visual MINTEQ3.0. For speciation calculation results, theycould provide reasonable estimations by optimization of inputs parameters.