Abstract
In this work, elimination two types of organophosphorus pesticides, diazinon and malathion spiked in aqueous solution by ultrasonic irradiation was investigated. Six different initial concentrations of diazinon and malathion (100, 300, 500, 200, 400, and 600 µg/L respectively) at different pH (3, 7, 9) and time (30, 45, 60, 90, 105 min) were investigated. Results showed that diazinon and malathion could be effectively and rapidly degraded by ultrasonic irradiation, and kinetics of both pesticides was strongly influenced by time, initial concentration and pH value. The results showed optimum condition degradation achieved at pH 3 and 9 for diazinon and malathion, respectively. Kinetic modeling applied for the obtained results showed that the degradation of diazinon and malathion by ultrasound followed first – order and second – order model. Keywords: Ultrasonic, Pesticide, Diazinon, Malathion, Sonochemical kinetic, Aqueous solution
Highlights
Diazinon and malathion are high – effective pesticides those are extensively applied in agriculture (Liu et al, 2008)
Ultrasonic irradiation of 200 ml diazinon or malathion solution operating at 130 kHz frequency and 500 W power in 5 time of remaining 30, 45, 60, 90, 105 min, reaction temperature in 25 ± 1 C
The effects of ultrasonic on the reaction rate coefficient of malathion and diazinon in water were evaluated by Anova one way, Nonparametric test: Mann – Whitney, and Kruskal – Wallis test
Summary
Diazinon and malathion are high – effective pesticides those are extensively applied in agriculture (Liu et al, 2008). Aqueous chlorine (Acero et al, 2008), and Fenton treatment (Wang and Lemley, 2008), ionizing radiation (Basfar et al, 2007) degradation were achieved through gamma – ray (Mohamed et al, 2009), X – ray (Trebse and Arcon, 2003), and ultraviolet ray (Okada et al, 2010; Dehghani et al, 2012). Some methods such as photocatalytic oxidation (Evgenidou et al, 2005; Dehghani and Fadaei ,2012), activated carbon (Foo, and Hameed, 2010) were performed. More recent studies have focused on some new methods such as biodegradation (Oller et al, 2010), and ultrasonic technique (Dehghani et al, 2008; Thangaradivel et al, 2009; Yao et al, 2010)
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