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Abstract
Our work is aimed to examine persistence , half- life , dissipation of five fungicides in both grape and mango fruits in field, lab, storage under cooling and monitoring in six governorates markets by determining the time until disappearing for each to ensure our environment and food safety. Four experiments were done, the first was in the field by spraying each fungicide on grape and mango sepaprately with the recommended dose for each, then the persistence and half-life were detected by detecting the effect of different temperature degrees, Direct sunlight, UV-rays in different intervals. After that tested fungicides are stored under cold conditions for short and long periods for each grape and mango fruits. Finally each of the tested fungicide is monitored in six governorates in bot grape and mango fruits. Extraction and clean up were made by using QuEChERS method, analysis were done by using GC and HPLC instruments. The obtained results could be summarized as follows: Recovery obtained was in the acceptable range which proves the relevance of the used method. The persistence loss of thiophanate methyl, propiconazole, tebuconazole, dinocap and fluopyram is detected in grape and mango fruits. The PHI (pre-harvest interval) of thiophanate methyl, propiconazole, tebuconazole, dinocap and fluopyram in grape fruits is 15, 3, 15, 15 and 10 days, in mango fruits 15, 7, 15, 15 and 10 days after application respectively. The regression coefficient (r2) was 0.99, 0.90, 0.93, 0.98 and 0.87, 0.88, 0.96, 0.98 and 0.94 for thiophanate methyl, propiconazole, tebuconazole, dinocap and fluopyram in grape and mango fruits respectively.By studying the photodegration, effect of temperature 35oC, 45oC, 55oC we found that the degree 55oC is the most effective on all studied pesticidesnces between tested fungicides to mode of action , rate of applications and different conditions