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On this page: • • • • • • • • What is EPI Suite ™? The EPI (Estimation Programs Interface) Suite™ is a Windows®-based suite of physical/chemical property and environmental fate estimation programs developed by EPA’s and Syracuse Research Corp. EPI Suite™ uses a single input to run the following estimation programs: KOWWIN™, AOPWIN™, HENRYWIN™, MPBPWIN™, BIOWIN™, BioHCwin, KOCWIN™, WSKOWWIN™, WATERNT™, BCFBAF™, HYDROWIN™, KOAWIN and AEROWIN™, and the fate models WVOLWIN™, STPWIN™ and LEV3EPI™. ECOSAR™, which estimates ecotoxicity, is also included in EPI Suite™. EPI Suite™ is a screening-level tool and should not be used if acceptable measured values are available. A clear understanding of the estimation methods and their appropriate application is very important.

Click on the Help tab in EPI Suite™ for detailed information on the methods and models in it. How are EPI Suite™ estimates used? EPI Suite™ provides users with estimates of physical/chemical and environmental fate properties. Before using EPI Suite™, users should first determine whether any suitable data are available from the literature (e.g., Merck Index, Beilstein).

This is facilitated by a database of >40,000 chemicals (called PHYSPROP©) that is included in the EPI Suite™ software. Dermwin™, a program that estimates the dermal permeability coefficient Kp, and is included in EPI Suite™. ECOSAR™ is a program that predicts aquatic toxicity and is included in EPI Suite™. ECOSAR™ can also be downloaded as a separate program from the ECOSAR home page. Individual models in EPI Suite™ • KOWWIN™: Estimates the log octanol-water partition coefficient, log KOW, of chemicals using an atom/fragment contribution method. • AOPWIN™: Estimates the gas-phase reaction rate for the reaction between the most prevalent atmospheric oxidant, hydroxyl radicals, and a chemical. Gas-phase ozone radical reaction rates are also estimated for olefins and acetylenes.

In addition, AOPWIN™ informs the user if nitrate radical reaction will be important. Atmospheric half-lives for each chemical are automatically calculated using assumed average hydroxyl radical and ozone concentrations. • HENRYWIN™: Calculates the Henry’s Law constant (air/water partition coefficient) using both the group contribution and the bond contribution methods. • MPBPWIN™: Melting point, boiling point, and vapor pressure of organic chemicals are estimated using a combination of techniques.

Included is the subcooled liquid vapor pressure, which is the vapor pressure a solid would have if it were liquid at room temperature. It is important in fate modeling. • BIOWIN™: Estimates aerobic and anaerobic biodegradability of organic chemicals using 7 different models. Two of these are the original Biodegradation Probability Program (BPP™). The seventh and newest model estimates anaerobic biodegradation potential. • BioHCwin: Estimates biodegradation half-life for compounds containing only carbon and hydrogen (i.e. • KOCWIN™: Formerly called PCKOCWIN™, this program estimates the organic carbon-normalized sorption coefficient for soil and sediment; i.e.