几种无机盐对矿物吸附Bt 毒蛋白的影响

he effects of the different concentration of KNO3, KH2PO4 and NH4H2PO4 on adsorption of the insecticidal protein of Bacillus thuringiensis (Bt) by kaolinite (K), montmorillonite (M), goethite (G) and silicon oxide (S), as well as the influence of different adding sequences among the inorganic salts and toxin, were studied. The results showed Low concentration (<10 mmol/L) of organic acid anions inhibited the adsorption of toxin by kaolinite, goethite and silicon dioxide, whereas high concentrations promoted the adsorption. The similar results were observed when adding the inorganic salts solution and toxin in different sequences. Moreover the simultaneous addition mode presented the most obvious influence on the toxin adsorption. The affecting degree of inorganic salts on different minerals was in the order of goethite > kaolinite ≥ montmorillonite > silicon oxide, and H2PO4->NO3-, NH4+>K+ for different inorganic ions.