[Effect of Cu2+ on the water solubility enhancement of 4, 4'-dibromodiphenyl ethers by humic acid].

The effect of copper ions on the water solubility enhancement of 4,4'- dibromodiphenyl ethers (BDE-15) by a commercial humic acid (HA) has been studied using batch equilibrium technique at various pHs. The characteristics of HA-Cu complex were investigated with the aid of dynamic light scattering and Zeta potential measurements. The results showed that the interaction of BDE-15 with HA could be explained by partition according to the linear isotherms when HA were at lower level, while the non-linear isotherms were observed at higher level of HA.

[Water solubility enhancements of tetrabromobisphenol A by dissolved organic matters].

Water solubility enhancements by two types of dissolved organic matter (DOM) extracted from a local wastewater treatment plant and by a commercial humic acid (HA) have been studied for tetrabromobisphenol A (TBBPA) using batch equilibrium technique, and the characteristics of DOM were studied with the aid of infrared and ultraviolet absorbance, elemental analysis, dialysis membranes and scanning electron microscope (SEM). The results showed that the effectiveness of DOM in enhancing solute solubility appeared to be controlled by the structure and molecular size of DOM, the ionic strength of solution and the dissociation ratio of TBBPA. Langmuir Equation could fit the isotherms of the total influent DOM and effluent DOM, and their binding coefficients (Kdoc) are 1.

[Sorption and desorption behaviors of tetrabromobisphenol A on fluvo-aquic soil].

Sorption and desorption behaviors of tetrabromobisphenol A (TBBPA) on fluvo-aquic soil were investigated using batch equilibrium experiments, and the effects of pH and ionic strength on the sorption were also evaluated. The results showed that the sorption process could be divided into the rapid sorption (0-24 h) and the slow sorption (24-48 h). The rapid sorption played the main role in the sorption of TBBPA and the sorption approached equilibrium at about 48 h.