Ecotoxical Behavior And Effects Of Synthetical Musks In Burozem

As the substituted fragrances, synthetic musks are widely used in the personal care products industry. Due to the continuous input to environment, some typical synthetic musks such as galaxolide and Musk ketone are being increased in water, soil and air, and have been accumulated in tissues of animals and human beings. As a result, the presence of synthetic musks in environment was just like persistent organic pollutants (POPs). Therefore, synthetic musks have been considered as emerging organic pollutants, whose behavior and toxicity has become a hotspot. In this study, single and joint effects of different concentration of synthetic musks (including musk ketone(MK) and galaxolide (HHCB)) and typical heavy mental cadmium(Cd) on wheat (Triticum aestivum) and the cadmium adsorption-desorption in burozem influenced by galaxolide (HHCB) were investigated. All of these will provide scientifical basis for the risk assessment of soils polluted by synthetic musks and cadmium.Results indicated that synthetic musks (MK and HHCB) and Cd had markedly significant inhibition on shoot and root elongation of wheat. The dose-effect relationships between the inhibition rates of wheat shoot and root elongation and MK concentrations with or without Cd addition were significant. HHCB and low concentration of Cd (2 mg·kg-1) had synergistic effects on shoot and root elongation of wheat. The results also showed that shoot and root elongation were the most sensitive indexes. And MK and HHCB showed different extent of toxicity to wheat seedlings.The adsorption-desorption results showed that Freundlich equation was the optimal model to describe the adsorptive-desorption isotherm of Cd2+ in burozem with or without HHCB addition. Low HHCB concentration treatment inhibited the adsorption capacity of Cd, while high HHCB concentration played a promoting role. The desorptive capacity was increased and then decreased rapidly with the increasing of HHCB concentrations. In the coexisting system of HHCB and Cd, the adsorptive-desorption kenitic of Cd2+ was fitting best with two-constant equation. HHCB treatments had no significant effect on the adsorptive rate.