• Journal of Food Hygiene and Safety
• /
• v.24 no.2
• /
• pp.136-142
• /
• 2009

This study was carried out to investigate the current status of suspected endocrine disrupting pesticides among the agricultural products in northern area of Seoul in 2007. 3,026 samples was analyzed by multiresidue method. Detected Pesticide in 11 cases were procymidone, endosulfan, chlorothalonil, chlorpyrifos, cyermethrin, fenvalerate, hexaconazole, carbendazim, pendimethalin, permethrin, parathion and exceeded 7 cases of endosulfan, procymidone, carbendazim, chlorothalonil, chlorpyrifos, cypermethrin, fenvalerate in the maximum residue limits(MRLs). Procymidone, endosulfan, chlorothalonil and chlorpyrifos comprised up to 80.5% in detected pesticides. Among the 321 cases of detected agricultural products, 287 cases(89.4%) were vegetables, 25 cases (7.8%) were fruits, Others were 9 cases(2.8%).

• The Korean Journal of Pesticide Science
• /
• v.8 no.4
• /
• pp.280-287
• /
• 2004

We investigated the residual amounts of endosulfan and procymidone taken by vegetables grown in hydroponics culture and field conditions treated with the pesticides in order to evaluate safe cultivation concentration of the pesticides in the vegetables. Endosulfan and procymidone were selected as test pesticides because they have been reported to frequently detect in agricultural products at different concentrations. In hydroponic culture, by Chinese cabbage, procymidone was absorbed 3.8 times higher than endosulfan. The higher the pesticide concentration get, the worse the plant grew. In soil treated with 10 mg/kg of endosulfan, the pesticide absorbed by Leafy radish, Chinese cabbage and radish was less then their MRLs. In case of carlot, the residue level in soil which did not exceed its MRL was 1 mg/kg. The concentrations of procymidone in soil which did not exceed the MRLs in Leafy radish, Chinese cabbage, radish and carrot were 10, 10, 2 and 1 mg/kg, respectively Usually aged endosulfan and procymidone residues were less absorbed into crops than the fresh ones. Chinese cabbage absorbed more endosulfan and pocymidone than leafy radish, radish doing more than carrot.

• Journal of Food Hygiene and Safety
• /
• v.14 no.4
• /
• pp.365-371
• /
• 1999

Microwave-assisted extraction (MAE) is known as a more environmental-friendly process with economic advantages in terms of less time, less solvent, less energy and less waste than the current reflux method that is time-consuming. MAE was applied to extract three pesticides (quintozene, tolclofos-methyl and procymidone) from ginseng in a pesticide residue analysis and eliminate pesticide contaminants from ginseng prior to production of the ginseng extracts. The optimal conditions for pesticide extraction from ginseng were 50% in power (150 watts), 2 minutes, 20 mL hexane and 2.0 g sample. The results of optimal conditions were compared with those of Soxhlet method (7 hours, 150 mL hexane). The recoveries between two methods were almost same while time and amount of solvent used in MAE were significantly decreased in comparing with those in the Soxhlet methods. When the 45% ethyl alcohol as a extraction solvent was applied to eliminate pesticides from ginseng prior to the production of the ginseng extracts, it was found that 100% quintozene, 69％ tolclofos-methyl and 83% procymidone were eliminated from ginseng. The data showed that MAE may be used to eliminate pesticide contaminants in ginseng prior to making the ginseng extracts.

• Korean Journal of Organic Agriculture
• /
• v.19 no.1
• /
• pp.121-134
• /
• 2011

For this study, Smilex powder, a pesticide, was sprayed on the Altari radish, and then underground water, Chitosan solution (${\times}$500), and wood vinegar solution (${\times}$1000) were evenly sprayed on the Altari radish respectively. Samples of Altari radishs for residual pesticide analysis were taken two hours, 1 day, 7 days, and 15 days after treatments, and the detectable concentration and degradability of procymidone, the pesticide residue, were measured. The results obtained are as follows: 1. When detectable concentration of procymidone within the altari radish was measured, treatment plots sprayed with underground water, Chitosan solution (${\times}$500), and wood vinegar solution (${\times}$1000) were found to show lower detectable concentration than the non-treatment plot which was sprayed with pesticide only. Especially, the treatment plots sprayed with Chitosan solution (${\times}$500), and with wood vinegar solution (${\times}$1,000) showed lower values than the average. 2. When the degradability of procymidone within the Altari radish was measured, the plot treated with Chitosan solution (${\times}$500) and the plot treated with wood vinegar solution (${\times}$1,000) were found to have relatively higher degradability of procymidone. There were not much differences among testing materials in the degradability of residual pesticides. However, the plot treated with Chitosan solution (${\times}$500) showed higher degradability. In terms of average degradability with time, degradability increased sharply 7 days after the foliar application of testing materials. 3. When the daily far-sighted view survey was conducted in order to find out growth disorder and damage on the Altari radish plants by the treatment of un-derground water, Chitosan solution (${\times}$500), and wood vinegar solution (${\times}$1,000), no symptomatic physiological disorders was observed on all the plants tested during the whole growing season at the tested concentration level.

• Environmental Analysis Health and Toxicology
• /
• v.18 no.4
• /
• pp.311-322
• /
• 2003

This study was carried out to investigate the 106 kinds of pesticide residues in agricultural products (n=3,614) by GC, for the northern area of Seoul from March (1999) to December (2000). The detection rate of pesticide residues in samples was 5.0% (mean =2.86$\pm$7.22 mg/kg, n=180). The order of the agricultural products in which pesticide residues were detected was korean lettuce > perilla leaf, pepper > chinese cabbage > leek > spinach. The percentage of the agricultural products in excess of MRL was 2.0% (n=73). The agricultural products in excess of MRL were korean lettuce (n=15), perilla leaf(n=13), leek (n=6), spinach (n=6), pepper (n=5), chwinamul (n=5), etc. The order of the pesticide residues which were detected in agricultural products was procymidone endosulfan chlorpyrifos vinclozolin chlorothalonil and diazinon. The average residual values of procymidone, endosulfan, chlorpyrifos, vinclozolin, chlorpyrifos, and diazinon were 4.07, 1.24, 1.27, 2.83, 17.71 and 1.48 respectively. The pesticide residues in excess of MRL were chlorpyrifos (n=19), endosulfan (n=12), procymidone(n=), vinclozolin (n=6), etc, and the measured concentration ranges of chlorpyrifos, endosulfan, procymidone, vinclozolin, pyrazophos, diazinon and EPN were 0.03-6.72, 0.18-5.8, 2.0-60.8, 1.70-20.33, 0.26-1.21. 0.59-4.3 and 0.28-4.19 respectively.

• The Korean Journal of Pesticide Science
• /
• v.6 no.4
• /
• pp.309-319
• /
• 2002

Soil adsorption study was carried out to define the mobility of pesticides or to evaluate leaching potential in soils. Five pesticides including ethoprophos, procymidone, iprobenfos, isoprothiolane, and butachlor were subjected to optimized adsorption experiment protocol for three types of cultivation soils. Freundlich adsorption coefficients (K) were ranged $0.35{\sim}0.95$ for ethoprophos, $0.98{\sim}2.2$ for iprobenfos, $1.2{\sim}4.3$ for procymidone, $1.5{\sim}3.5$ for isoprothiolane and $7.9{\sim}19$ for butachlor in three soils. Based on Koc values, ethoprophos was classified as mobile, iprobenfos, isoprothiolane and procymidone as moderately mobile and butachlor as slightly mobile. Two evaluation methods, Groundwater Ubiquity Score (GUS) index and standard indices of soil-chemical adsorption and biodegradation, were used for the estimation of pesticide leaching potential. Leachability of isoprothiolane and iprobenfos were evaluated as moderate, ethoprophos as a little potential, while butachlor and procymidone showed very low leaching potential. The leaching potential of pesticides was essentially determined on the basis of intrinsic properties of the pesticides and environmental properties. Among the soil properties, organic matter gave a great influence on the leachability of soils. Therefore, leachabilities of pesticides were expected less in loam with relatively higher organic matter than clay loam with lower organic matter.

• Proceedings of the Korea Society of Environmental Toocicology Conference
• /
• 2003.10a
• /
• pp.49-53
• /
• 2003

Through the five years analysis of monitoring data on pesticide residues from 1998 to 2002, current status on pesticide residues on commercial agricultural products in Seoul area was evaluated. The rate of over maximum residue limits(MRLs) has been decreased into 5.8% in 1998, 2.5% in 1999, 1.6% in 2000, 1.4% in 2001, and 1.5% in 2002 gradually, where as total sample numbers analyzed increased 1,300 in 1998, 4,200 in 1999, 5740 in 2000, 6,160 in 2001, and 5,440 in 2002 annually, The pesticide which frequently detected in samples were endosulfan, procymidone, chlorotalonil, vinclozolin, and chlorpyriphos and pesticide found over MRLs were procymidone, vinclozolin, endosulfan and etc.

• Journal of Food Hygiene and Safety
• /
• v.3 no.4
• /
• pp.193-202
• /
• 1988

A pesticide monitoring study was undertaken for the strawberry and cucumber samples collected from plastic film houses and additional strawberries from supermarkets located in Seoul city in 1983 to evaluate pesticide residues in these food commodities and also to give basic informations in establishing maximum residue limits. Organophosphorus insecticides were not detected in any cucumber samples except that diazinon found with low residue levels in two strawberry samples. Fungicide procymidone and chlorothalonil were detected with considerable high frequencies in these vegetables while their residue levels were fairly low. Even the maximum residue levels. they were much lower than maximum residue limits established in these vegetables in Environment Administration. Korea. Of the strawberries from supermarkets in Seoul city, procymidone, chlorthalonil and dichlofluanid fungicides were also detected with similar detection frequencies and residue levels to those from the plas tic film houses. By washing the strawberries with tap water, the residues were removed from 38% to 95% of the total residues. Presently, it is considered that pesticide residues in strawberry and cucumber may be no harmfullevels for food commodities.

• The Korean Journal of Pesticide Science
• /
• v.10 no.2
• /
• pp.138-148
• /
• 2006

Two bacteria were isolated from the continuously pesticide-used soil under plastic film house and upland condition. The degradation test of several pesticides by the selected bacteria, B59 and B71, were conducted. The degradation rates for 6 pesticides, procymidone, chlorothalonil, ethoprophos parathior, alachlor and pendimethalin, in medium by the isolates were 21.1% to 53.2% higher than non-inoculated medium. Under shaking culture condition, 90% to 95% of procymidone was degraded after 21 days treatment. Parathion was degraded in the range of 60% to 100% by B71 and B59, respectively. Otherwise 70% of alachlor was degraded by the two isolated bacteria during same period. The pH was not significantly affected for degradation of pesticides. The bacterial strains, B59 and B71 was identified as Acinetobacter sp. and as Pseudomonas sp. based on morphological, biochemical and physiological characteristics, and identity and similarity of automatic identification system, Biolog and MIDI.

• Journal of Applied Biological Chemistry
• /
• v.63 no.3
• /
• pp.275-282
• /
• 2020

As pesticide safety was extended to agricultural environments and Positive List System was carried out, Pesticide safety management in soils has become even more important. To improve pesticide safety in soils needs the degradation technology of the residues in soils and reduce plant uptake of pesticides. In this study, biochars and quicklime as the degradation methods of pesticides (azoxystrboin, procymidone and tricyclazole) were used to identify the reduction effects. The experimental methods were putting biochars and quicklimes (0, 0.5, 1.0, 2.0% per 15 cm soil weight) in soils and analyzing the pesticide residues at 0, 10, 20, 35, 50 day. To identify the reduction effects of uptake from soil to korean cabbages (roots, leave, stems) by biochar treatment, the residues in samples were analyzed. As a results, azoxystrobin (36-96%), procymidone (40-117%) and tricyclazole (26-83%) were reduced in soils when treated with 2.0% quicklime (p<0.05). There were no reduction effect in soils when treated with 1.0% or less biochar. However, the amounts of residues translocated to roots (0.11-1.62 mg/kg), leave (0.05-0.29 mg/kg), stems (0.06-0.1 mg/kg) were reduced treated with 2.0% biochar treatments. The biochar and quicklime can be applicable to agricultural field to improve pesticide safety in soils.