The aim of this study was to investigate four insecticide residues in cucumbers with the aid of QuEChERS 2007.1 method. For method verification assessment, pesticide-free cucumber matrix was spiked with 0.1, 1 and 10 times of MRL for each pesticide. The QuEChERS-LC-MS/MS analytical method revealed that the detection limits of the insecticides were below the MRLs and the overall recovery of method was 97.7%. These figures were within the SANTE recovery limits (60-140%) and the values specified for the repeatability (≤20%). Cucumbers were collected from six different stands (A-F) at Çanakkale open markets for 6 weeks between 23 November and 28 December 2018. Residues of each sampling time and each stand were assessed. Acetamiprid residue of 257g and 236 µg/kg were detected in week 5 from stand B and in week 2 from stand E, respectively. These values are close to MRL (300 µg/kg). Formetanate hydrochloride residue of the week 3 from stand F (36.3 µg/kg) was more than MRL of 10 µg/kg. Pirimiphos methyl and chlorpyrifos residues were not detected in cucumbers. Theoretical maximum daily intake assessment showed that there was no chronic exposure risk for these four pesticides through cucumber consumption.

Bu çalışmada pirimiphos-methyl kalıntısının kapya biberinde farklı yıkama uygulamaları ile azaltılması amaçlanmıştır. Çanakkale ili Çıplak köyünde 2018 yılında yetiştirilen kapya biberlerinde 3 defa pirimiphos-methyl etkili maddeli insektisit uygulanmıştır. Biberler, son insektisit uygulamasının 1., 2., ve 3. günlerinde hasat edilmiştir. Daha sonra biberler, çeşme suyu, sitrik asit, asetik asit çözeltileri ve ultrasonic banyo ile yıkama uygulamalarından (2 ve 5 dakika boyunca) geçirilmiştir. Kalıntı analizleri, QuEChERS analiz methodu ile gerçekleştirilmiştir. Her yıkama uygulaması için işleme faktörü (Pf) ve pestisit azalma oranları 3 farklı hasat zamanı ve 2 farklı uygulama süresi esas alınarak hesaplanmıştır. Pf değerleri, tüm uygulamalarda 1'den daha az bulunmuştur. Yıkama süreleri arttıkça (2 ve 5 dk) kalıntı miktarı azalmıştır. Aynı şekilde hasat zamanı arttıkça kalıntı azalma oranı da düşmüştür. Bu durumda Pf de artış göstermiştir. Yıkama uygulamalarının pirimiphos-methyl kalıntısını azaltma oranlarına göre etkinlikliklerinin sırasıyla ultrasonik yıkama> sitrik asit >asetik asit> çeşme suyu şeklinde olduğu belirlenmiştir. Pirimiphos-methyl için en düşük azalma; 2. günde alınan örneklerde 2 dakikalık çeşme suyu (%14.97) uygulaması ile, en yüksek kalıntı azalma ise 1. günde alınan örneklerde 5 dakikalık ultrasonik yıkamada (%87.16) elde edilmiştir. Removal of pirimiphos-methyl residues from capia peppers by different washing application Anahtar Sözcükler: İşleme faktörü (Pf) Pestisit kalıntısı Ultrasonik yıkama Yıkama solusyonları ABSTRACT Removal of pirimiphos-methyl residues from Capia peppers by different washing applications was investigated. Capia peppers, grown in the field located in Çıplak village of Çanakkale in 2018, were sprayed three times with pirimiphos-methyl. Peppers were harvested after 1 st , 2 nd and 3 rd day of last pesticide application. Then, peppers were treated with tap water, acetic acid and citric acid solutions and ultrasonic cleaning applications (for 2 and 5 min.). Residue analyses were carried out with QuEChERS analytical method. Processing factors (Pf) and reduction rates were calculated for each washing application based on three different harvest times and two different application times. Pf values were less than 1 for all cases. The residues decreased during washing applications with increasing washing duration. Also, reduction rate of primphosmethyl residues decreased with the increased harvest times. This in turn corresponded to an increase in Pf. The order of washing applications, in terms of the reduction rates of the pirimiphos-methyl residue (from highest to lowest), is as follows; ultrasonic cleaning> sitric acid> acetic acid> tap water. The lowest reduction rate (14.97%) for pirimiphos-methyl was observed in 2 min tap water applications of 2nd-day samples. The higher reduction rate (87.16%) of pirimiphos-methyl was observed in 5 min ultrasonic cleaning applications of zero day samples.