Patterns of Uptake and Removal by Processing Types of Triazole Fungicides in Onion

Lee, Eun-Hyang; Hwang, Jeong-In; Kim, Jang-Eok

doi:10.7585/kjps.2015.19.3.248

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The amount of chlorpyrifos absorbed in cucumber root was found to range from 1.0 to 1.3% of the initial soil concentration and was not translocated to fruits [11]. Studies with boscalid, chlorfenapyr, fluquinconazole, and tetraconazole found that the concentrations of these chemicals in Korean cabbage or onion were less than 2.5% compared with the initial soil concentration [25,26].…”

Section: Introductionmentioning

confidence: 94%

Translocation of chlorpyrifos residue from soil to Korean cabbage

Hwang

Moon

2018

Appl Biol Chem

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The loss of residual chlorpyrifos in soil and the amount translocated to Korean cabbage were investigated in this study. Field trials with Korean cabbage were carried out in two greenhouses located in Yongin (Field 1) and Gwangju (Field 2). Soil and Korean cabbage samples were collected on different days following the treatment of soil with chlorpyrifos at two different rates. The initial amounts of residue in soil were 1.15 and 3.58 mg/kg, and these decreased to 0.22 and 0.49 mg/kg at 36 days after treatment (DAT) in Field 1. These values were 20.9 and 59.3 mg/kg, decreasing to 3.03 and 5.24 mg/kg at 43 DAT in Field 2, respectively. In Field 1, the half-life of chlorpyrifos was approximately 15.0 and 10.2 days in soil treated with 0.12 and 0.24 g a.i./m 2 , respectively. In Field 2, the half-life of chlorpyrifos was approximately 27.7 and 9.6 days following application of 0.36 and 0.72 g a.i./m 2 , respectively. When compared with the initial concentration in soil, the absorption ratio of chlorpyrifos residue to Korean cabbage was 0.93-6.01 and 0.57-2.61%, respectively. Therefore, safe management guidelines for chlorpyrifos in soil used to cultivate Korean cabbage may be suggested as 3.3 mg/kg regarding the maximum residue limit of chlorpyrifos on Korean cabbage (0.2 mg/kg).

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Section: Introductionmentioning

confidence: 94%

Translocation of chlorpyrifos residue from soil to Korean cabbage

Hwang

Moon

2018

Appl Biol Chem

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“…Some experiments have analyzed the levels of pesticides absorbed from soil contaminated with boscalid, chlorfenapyr, fluquinconazole, and tetraconazole. These studies showed that the levels of these pesticides in Korean cabbage or onion were less than 2.5% in comparison to the spiked concentration in the soil [29,30].…”

Section: Introductionmentioning

confidence: 98%

Residual Level of Chlorpyrifos in Lettuces Grown on Chlorpyrifos-Treated Soils

et al. 2018

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This study was conducted to investigate the residual loss of chlorpyrifos and the amount transferred to lettuce from soil. Field trials on lettuce were conducted in two different greenhouses located in Yongin (field 1) and Gwangju (field 2) in Korea. Soil and lettuce samples were collected on different days after the treatment of chlorpyrifos at two different levels. The initial residue of chlorpyrifos (0.86 and 2.31 mg/kg) in soils decreased to 0.06 and 0.18 mg/kg, respectively, at 36 days after treatment (DAT) in field 1, and the initial residue with values of 11.10 and 22.59 mg/kg decreased to 1.20 and 3.04 mg/kg, respectively, at 43 DAT in field 2. In field 1, the half-lives of chlorpyrifos were approximately 8.4 and 9.0 days for soils treated with 0.86 and 2.31 mg/kg, respectively, while in field 2, the half-lives of chlorpyrifos were approximately 18.7 and 13.9 days for soils treated with 11.10 and 22.59 mg/kg, respectively. Residue levels of chlorpyrifos on lettuce were 0.66–5.98% and 2.71–13.26% compared to the initial concentration in the soil. Therefore, the management guideline of chlorpyrifos for lettuce-cultivating soils could be suggested to be 0.75 mg/kg with regards to the Positive List System level of chlorpyrifos on lettuce of 0.01 mg/kg.

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“…Hence, pesticide residues present within plant tissues may not be easy to be removed using any of external treatment methods. Some studies showed that heating or frying food ingredients with water or oil could reduce significant amounts of pesticide residues [16,17]. However, as fruit crops like apples are routinely consumed in a fresh state, several limited methods such as washing and peeling can be employed for removing the pesticide residues [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of cuticular waxes on permeation of fungicides azoxystrobin and chlorothalonil into apples

2019

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Time-dependent permeation characteristics of two fungicides azoxystrobin and chlorothalonil into apples were investigated in the presence and absence of the cuticular waxes. Either apple samples which were subjected to waxremoving treatment or not (raw) were individually submerged in each dilution solution of the tested fungicides for a short time, and some of each submerged sample were then washed in running tap water. All apple samples were incubated under controlled conditions and collected sequentially after 1, 24, and 48 h. The collected apple samples were divided into four tissue parts before fungicide residue analysis: peel, pulp-1, pulp-2, and pulp-3. Most residues of azoxystrobin (70.7-86.4%) in apples were present in the peel, and the residual extents in the pulps increased by removal of cuticular waxes. By washing treatment, 52.3-69.2% of azoxystrobin residues in raw apples were removed. Meanwhile, all chlorothalonil residues were determined in the peel of apples, and their concentrations slightly increased by wax removal. However, significant chlorothalonil residues (84.5-91.1%) were removed by washing the apple surface. Results in this study may be extensively utilized as basic data to understand characteristics of cuticular permeation and translocation of fungicides applied on fruit crops.

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Patterns of Uptake and Removal by Processing Types of Triazole Fungicides in Onion

Cited by 6 publications

References 21 publications

Translocation of chlorpyrifos residue from soil to Korean cabbage

Translocation of chlorpyrifos residue from soil to Korean cabbage

Residual Level of Chlorpyrifos in Lettuces Grown on Chlorpyrifos-Treated Soils

Effects of cuticular waxes on permeation of fungicides azoxystrobin and chlorothalonil into apples

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