Half life 1.1.1.2 how to#
Half life 1.1.1.2 manual#

Specific guidance for each analysis is included in this User's Guide. T-REX may be used for foliar applications, seed treatments, or LD 50/ft 2 analysis. T-REX is designed to be easy to use, yet maintain a level of flexibility needed for the multitude of chemicals and use patterns encountered by risk assessors. Users without access to the share drive should contact Brian Anderson or Edward Odenkirchen, the program authors.

Users need access to the EFED share drive (G: drive) for this function to work. These comments will be used in creating future versions of the model therefore, all users are strongly encouraged to submit comments. A comment will not be sent unless you exit out of cell B6. Exit out of cell B6, then click on the 'submit comment' button. To submit a comment, type your last name in Cell B3 and your comment in Cell B6. The EFED user can submit comments on T-REX in the Comment worksheet.

Submitting Comments on T-REX, Version 1.5.

Half life 1.1.1.2 manual#

This manual is intended to provide general guidance on the use of T-REX and is not intended to serve as a comprehensive guide on EFED's terrestrial risk assessment policies and methods. The User's Guide provides guidance to the assessor on inputs needed to run T-REX ( Section 2), describes the calculations performed by T-REX and the results ( Section 3), and provides guidance on characterizing the results in the risk description of an ecological risk assessment ( Section 4). Important: When saving the workbook, select 'Excel Macro-enabled Workbook' in the file type options. Across the bottom of the Excel Р’В® window are several worksheet tabs, indicating the various functions performed by T-REX. This worksheet contains the version information, new model updates, and a list of references. Once T-REX is opened, the 'READ ME' worksheet is displayed. If errors were identified, they were addressed and/or corrected. A Quality Assurance Project Plan was developed and then approved by the project team and the QA Manager. T-REX v.1.5 has undergone a formal internal Quality Assurance (QA) review in the Environmental Fate and Effects Division (EFED). T-REX also calculates risk quotients for granular applications and seed treatments. For example, T-REX adjusts acute and chronic toxicity values based on the relative body weight of the animal being assessed compared with the animal used in the toxicity studies. However, T-REX performs a number of calculations that neither FATE nor TERREEC perform. T-REX, similar to the models FATE and TERREEC, calculates terrestrial exposure concentration estimates on plant surfaces following pesticide application. Avian and mammalian risk quotients are also calculated for seed treatment applications for various crops. The results are presented by weight class for various sized birds and mammals for each type of application.

Using an adjusted LD 50 method, T-REX calculates LD 50 ft -2 values for both broadcast and banded (granular and liquid) applications.

Based on residue and dissipation rate calculations, this spreadsheet-based model also estimates acute and reproductive risk quotients. T-REX calculates the residues on avian and mammalian food items along with the dissipation rate of a chemical applied to foliar surfaces for single or multiple applications.

Half life 1.1.1.2 how to#

This document will provide directions on how to use T-REX and will explain how to estimate exposure concentrations and risk quotients for birds and mammals. Welcome to the Terrestrial Residue EXposure (T-REX) model User's Guide. The authors would also like to thank the members of the Terrestrial Biology and Terrestrial Exposure Technology Teams for their input and assistance in the development of this User's Guide and Spreadsheet. (Link to-) Initial Pesticide Residues on Arthropods