7NRC. Science and Judgment in Risk Assessment[M]. National Academy Press, Washington, D.C., 1994
8Power M, McCarty L S. Trends in the development of ecological risk assessment and management frameworks[J]. Human and Ecological Risk Assessment, 2002, 8(1): 7-18
9USEPA. Guidelines for carcinogen risk assessment[M], NCEA-F-0644,1986
10USEPA. Guidelines for Exposure Assessment[M]. FRL-4129-5, 1992, 186
6Said Muhammad,Tahir Shah.M ,Sardar Khan.Health risk assessment of heavy metals and their source apportionment in drinking water of Kohistan region,northern Pakistan.Microchemical Journal,2011,98 (2).
7NRC (National Research Council).Risk assessment in the federal government : Managing the process.Washington, DC : National Academy Press, 1983.
8US EPA.Superfund public health evaluation manual.EPAP540P1- 86.Washington DC :US EPA, 1986.
9US EPA.Available information on assessment exposure from pesti- cides in food.Washington DC:US.Environmental Protection Agency Office of Pesticide Programs ,2000.