持久性有机污染物在环境中相的划分及相平衡的泛逸度模型设想

鉴于持久性有机物在环境中的结合和承载机制,作者认为,对于持久性有机物,环境可以抽象为气相、水相、有机碳相和脂相等四个均质、同结合作用的环境相,为描述持久性有机物在环境相间的平衡分配行为,引入了“泛逸度”的概念,建立了环境相间相平衡酌泛逸度模型,并以DDT为例尝试了模型的应用。

ENVIRONMENTAL PHASES AND PAN-FUGACITY MODEL ON PHASE EQULIBRIUM OF PERSISTENT ORGANIC POLLUTANTS

To study the environmental behaviour of persistent organic pollutants, the general approach is modeling their interphase equlib-rium between the air, water, soil and;biota 'phases",using concentration models. However, there are two flaws involving in this general approach.1)the concept of "phase" here is not suitable whether in physico-chemical views or in environmental chemical views;2) the concentrations of chemicals are greatly different in various phases and may lead to confusions. In our article,we have generated a new pan-fugacity model method. We divide the whole environmental into four phases, including the air phase, aquatic phase, organic carbon phase and lipid phase. Then we introduce the concept of pan-fugacity and have developed a pan-fugacity model. As an applicable example, the partitioning behaviour of DDT in environment has been studied.