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A closed formula for calculating pesticide residue levels in the feed items of terrestrial species
Author(s) -
Van Cott Cornelia,
Van Cott Andrew,
Gagne James
Publication year - 2018
Publication title -
integrated environmental assessment and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 57
eISSN - 1551-3793
pISSN - 1551-3777
DOI - 10.1002/ieam.4082
Subject(s) - residue (chemistry) , pesticide residue , pesticide , software , environmental science , computer science , mathematics , chemistry , ecology , biology , operating system , biochemistry
Calculating pesticide residue levels in feed items for terrestrial species requires accounting for the application rate of the pesticide, the frequency and interval of application, the half‐life of the pesticide on the food item, and the residue unit dose. Microsoft Excel™–based applications such as the US Environmental Protection Agency's Terrestrial Residue Exposure model (T‐REX) and Terrestrial Herpetofaunal Exposure Residue Program (T‐HERPS) calculate the residue levels in feed items using a recursive sequence. A recursive sequence is an unwieldy calculation method that presents a barrier to creating a software‐based tool capable of conducting flexible assessments. Therefore, we determined the closed form of the recursive mathematical equation used by both T‐REX and T‐HERPS. With this formula, we can both duplicate screening‐level assessments (T‐REX, T‐HERPS) as well as incrementally refine the assessment with data‐driven inputs. Integr Environ Assess Manag 2018;14:703–709. © 2018 SETAC