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Các khái niệm và mô hình của chemodynamics được cung cấp chi tiết đáng kể bởi Thibodeaux (5), và Reible và Choi (6). Theo mục đích của cuộc thảo luận này, nó được giả định rằng các mô hình thích hợp của số phận và vận chuyển chất gây ô nhiễm đối với trường hợp được biết, ước tính, hoặc có sẵn trong một số thời trang. | material and energy balances many be found in a number of chemical engineering texts such as Felder and Rousseau 4 and others. 3 ADDITION OF CHEMODYNAMICS In order to take LCA beyond its usual scope to assess a waste site remedy we need not only to include the mass and energy balances for environmental compartments but also the models and mechanisms of inter- and intramedia transport. The concepts and models of chemodynamics are provided in significant detail by Thibodeaux 5 and by Reible and Choi 6 . For the purposes of this discussion it is assumed that appropriate models of the fate and transport of contaminants for a case are known estimated or available in some fashion. Since the objective of the LCA in remediation is to assess the burden being placed on the environment by various remedies the application of realistic and appropriate models is essential and found in references above 5 6 for certain cases. 4 APPLICATION With the objective being assessment of the environmental eco- and human health burden from various remedies in a waste site problem we may employ as with LCA risk assessment in the reverse following the methodology of Hwang 7 as extended by Constant et al. 8 . The exposure is summed from different routes to get total exposure Et which to have an acceptable risk should not exceed the reference dose level RL . Exposures are calculated as in any other assessment based on concentration time body weight etc. Key here is the concentration at the exposure point receptor which is a function of the concentration in the soil or other medium. This function is the subject of much modeling work as described above as it is essential to have accurate representations of the fate and transport of the contaminants in and across media under investigation. Thus one may apply the above exposure method for an acceptable risk combined with LCA as follows 8 . First land use or other resource needs are established followed by assuming a chemical management or .
