Behavior of Thiophanate Methyl and Propiconazole in Grape and Mango Fruits Under the Egyptian Field Conditions

Abstract

This research aims at determining residues of thiophanate methyl and propiconazole in grape and mango fruits as an indication for their persistence in this environmental compartment. Fruit extracts were analyzed for thiophanate methyl using High Performance Liquid Chromatography and using Gas Chromatography Electron Capture Detector (GC/ECD), respectively. The results indicated that propiconazole had a less environmental impact since propiconazole had shorter residue half-lives which were 1.24 and 1.19 days in grape and mango fruits, respectively, while thiophanate methyl had half-lives of 2.49 and 2.64 days in mango and grape, respectively. The degradation rates of propiconazole in grape and mango fruits did not change significantly and neither did those of thiophanate methyl. According to the maximum residue level, the pre-harvest intervals of propiconazole were set to be 3 and 7 days for grape and mango fruits, respectively, and the pre-harvest intervals for thiophanate methyl were 15 days for both grape and mango fruits. Propiconazole was generally considered to be less hazardous to humans and will leave the environment less altered because of its faster degradation than that of thiophanate methyl.

Analysis of the dissipation kinetics of thiophanate‐methyl and its metabolite carbendazim in apple leaves using a modified QuEChERS–UPLC–MS/MS method

“…The rank of DT 50 for three tests was July > August > June. There have been DT 50 values reported for TM in biological samples, such as 1.52 days in tea (Chen et al, ), 2.49 days in mango (Soliman et al, ), 2.64–7.00 days in grape (Dong, Zeng, & Bai, ; Mandal, Das, & Bhattacharyya, ; Soliman et al, ) and 22–41 days in carnation leaf (Brouwer, De Haan, Leenheers, De Vreede, & Van Hemmen, ), depending on the plants, culture conditions and even fitting models (Fantke & Juraske, ). The comparison of DT 50 values indicated that the dissipation of TM in apple leaves was slower than that in tea or mango, approximately equal to that in grape and faster than that in carnation leaf.…”

Study on degradation behaviour, residue distribution, and dietary risk assessment of propiconazole in celery and onion under field application

“…The pesticide offers the benefits of protection, treatment, and absorption and can prevent the growth and reproduction of fungi by interfering with ergosterol biosynthesis and inhibiting steroid demethylation 9 . It is widely used to control fungal diseases, such as alternaria black spot, anthracnose, grey mould, and powdery mildew, on fruits, vegetables, cereals, and other field crops 6,8,10,11 . The fungicide is usually sprayed twice to control leaf spot on celery and three times to control violet leaf spot on onion.…”

“…In the previous literature, a number of studies on the residual behaviour of propiconazole in banana, grape, mango, pomegranate, wheat, and ginseng domestically and internationally have been reported 6–8,10–12 . However, there has been no systematic study conducted on degradation behaviour, residue distribution, and dietary risk assessment of propiconazole in celery and onion.…”

Dissipation behavior of thiophanate-methyl in strawberry under open field condition in Egypt and consumer risk assessment

“…However, the Quick Easy Cheap Effective Rugged Safe (QuEChERS) method, in combination with LC-MS/MS has gained considerable attention for the sensitivity level they attain, beside the good selectivity and short analysis time (Akkbik and Hazer 2018;Chen et al 2013;Dong et al 2018;Economou et al 2009;Ferreira et al 2016;Qin 2016;Wu et al 2015;Yu et al 2017;Zhang et al 2012). On the other hand, solid phase extraction (SPE) methods have been frequently applied in combination with HPLC-DAD (Chen et al 2015;Soliman et al 2017;Veneziano et al 2004;Wu et al 2014).…”