• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.375-381
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• 2018

This study was performed to investigate the residual characteristics of the insecticide dinotefuran in asparagus under greenhouse conditions from July to August and consequentially to obtain basic data for guidelines on the safe use of this pesticide in asparagus. Residues of dinotefuran in young stem of asparagus before and after growing mother stem were analyzed from samples collected at 0, 1, 3, 5, and 7 days after single application of a commercial formulation of dinotefuran (wettable powder, 10%) at the recommended dose (2,000 times dilution). The residue of dinotefuran in young stem of asparagus was analyzed by HPLC-UVD, and recovery of dinotefuran in young stem was tested at 0.5 and 1.0 mg/kg concentrations. As a result, the limit of quantitation (LOQ) of dinotefuran was 0.01 mg/kg, and the recovery of dinotefuran was in the range of 83.3-94.0% with a coefficient of variation less than 10%. Residues of dinotefuran in young stem of asparagus before and after growing the mother stem were lower than the tentative limit (0.05 mg/kg) from 5 and 3 days after single application, respectively. Based on these results, single application of dinotefuran (wettable powder, 10%) at the recommended dose at 7 days before harvest would have no deleterious effects on safety issues concerning pesticide residue. This result might provide basic information to construct guidelines for the safe use of dinotefuran in asparagus.

• The Korean Journal of Pesticide Science
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• v.18 no.4
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• pp.228-235
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• 2014

The residue levels of flonicamid and its metabolites, 4-(trifluoromethyl)nicotinic acid (TFNA) and N-4-(trifluoromethyl)nicotinoyl glycine (TFNG) in sweer pepper were investigated to examine the residual characteristics of analytes for 87 days after pesticide application. The pesticide was applied once at recommended dosage and double dosage by foliar sprays and the samples of fruits and leaves of sweet pepper were collected for each treatment. The residues of flonicamid in all of fruits and leaves decreased gradually over time, while the residue levels of TFNG metabolite exhibited tendency that increased for long periods and thereafter decreased. Total flonicamid residual concentrations containing metabolites residues in fruit samples increased consistently until 30 days post-application and higher residue levels than residues at 1 day post-application were detected from 30 day to 87 day after treatment. The residue pattern observed in fruit could be explained by the movement of TFNG from leaves to fruits of plant. Such residual characteristic was similarly found in samples treated both recommended dosage and double dosage.

• Korean Journal of Environmental Agriculture
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• v.30 no.1
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• pp.89-97
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• 2011

BACKGROUND: Cypermethrins, possess eight isomers, used both as pesticide and as veterinary drug, were set different MRLs for livestock by CCPR and CCRVDF of Codex Alimentarius. Korea Food Code designates MRLs for livestock only as pesticide. METHODS AND RESULTS: This study presented necessaries of harmonization of MRL setting for compounds used both as pesticides and as veterinary drugs with regulatory aspects, showing an example of cypermethrin residue in livestock. CONCLUSION(S): For harmonization, following factors must be considered and recommended; designation of marker residue; alpha-cypermethrin, zeta- cypermethrin, and cypermethrin, clarification of the definition of target tissues; meat, fat, muscle, by-product, eggs, milk, and etc., method of analysis; clarification of target analytes of isomers, quantitation and calculation method as a principle of residue analysis.

• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.11
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• pp.1515-1522
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• 2008

Monitoring the pesticide residues in agricultural products is essential to protect consumers, obtain data for risk assessment, and ensure fair trade practices. We developed a multi-residue method for the analysis of 37 pesticides with different physico-chemical properties in agricultural products and analyzed the amount of pesticide residues on about 1,000 samples circulated in South Korea. The samples consisted of 26 different types of agricultural products selected at markets in 14 major cities; cereals (2 species), nuts (1 species) potatoes (1 species), beans (2 species), fruits (3 species), vegetables (16 species), and mushrooms (1 species). In this study, residual pesticides were detected in 23 samples (2.2%) and one sample was detected to be over maximum residue limits (MRLs, 0.1%) for pesticides in foods by the Korea food code. In leafy vegetables such as pepper leaves, radish leaves, cham-na-mul, shin-sun-cho, crown daisy, chwi-na-mul and citrus fruits such as kumquat, 8 kinds of pesticides were detected. Specially, diazinon were detected over MRLs and also, endosulfan, ethoprophos and phenthoate were detected frequently. Based on these results, we investigated the risk assesment from amount of residual pesticide, total %ADI was 1.262%, but the value has not effected on human health.

• Journal of the Korea institute for structural maintenance and inspection
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• v.7 no.3
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• pp.231-239
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• 2003

Many foundation jobs have been designed and constructed in Korea with the sole information obtained from the SPT. The use of the CPT to estimate equivalent SPT values is becoming a common application for foundation design. The relationship between the CPT and the SPT has been determined in a number of studies over the past three decades. However a few papers have been published on the relationship between the CPT and the SPT in residual soil. Due to the large variation in published correlations between qt and N in residual soil, local correlations should be developed wherever possible. CPT tests have been carried out in the residual soil classified by SM in accordance with USCM and compared with SPT. Value of qt/N = 0.3 have been suggested for residual soil in Korea.

• Journal of the Korea Convergence Society
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• v.12 no.11
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• pp.511-519
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• 2021

This study aimed to identify the effect of job embeddedness and organization attachment on the intention to stay of hospital nurses in the convergence society. The participants were 211 general hospital nurses; data were analyzed using t-test, ANOVA, Pearson correlation, Multiple regression. This study found that: hospital nurses showed higher score at job embeddedness, higher organization attachment, higher scores for intention to stay. The main factors influencing intention to stay were job embeddedness and organization attachment. They explained about 45% of the intention to stay. Thus, it is necessary to allocate tasks and evaluate appropriate to the nurse's ability and support individual and organizational activities that can enhance organizational attachment.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.440-446
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• 2003

농산물의 품질 향상과 생산성 증대를 위해 농약의 적절한 사용이 필요하다. 그러나 농약을 적절히 사용해도 수확 농산물의 표면이나 내부에는 농약이 잔류할 가능성이 항상 있다. 농약의 과다한 잔류는 국민 보건상 커다란 문제가 될 수 있으므로 농약의 잔류량을 신속히 측정할 수 있는 분석법이 절실히 요구되고 있다(박, 2003). 살충제 Imidacloprid는 유기인계 살충제로 해충에 전신마비, 이완, 활동성 저하 등을 일으켜 박멸한다. 국내에서는 귤굴나방, 조팝나무 진딧물, 벼멸구, 굼벵이 류 등의 방제를 위해 감귤, 사과, 고추, 배, 장미, 복숭아 및 벼농사에 광범위하게 사용되고 있다(Bayer CropScience-Korea, 2002). (중략)

• Journal of Applied Biological Chemistry
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• v.56 no.2
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• pp.113-117
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• 2013

Ten major residual biogenic amines including toxic histamine and tyramine were investigated in the plant-based minor Korean fermented food. From the analyses of pickled vegetables, fermented vegetable extracts, fermented tea, black garlic and herbal rice wines, more than 100 mg/kg of histamine were found in pickled soy leaf and pickled mulberry leaf, and also over 1,000 mg/kg of total biogenic amines were found in pickled soy leaf. No sample was found over in black garlic, fermented tea, fermented vegetable extracts and herbal rice wine, less than 100 mg/kg of histamine and/or 1,000 mg/kg of total biogenic amines were observed. Interestingly, all the tested rice wines were found to be over 100 mg/kg of agmatine residue.

• Journal of Advanced Navigation Technology
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• v.25 no.3
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• pp.194-202
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• 2021

Ionosphere, one of the largest error sources, can pose potentially harmful threat to single-frequency GNSS (global navigation satellite system) user even after applying ionospheric corrections to their GNSS measurements. To quantitatively assess ionospheric impacts on the satellite navigation-based applications using simulation, the standard deviation of residual ionospheric errors is needed. Thus, in this paper, we determine conservative statistical quantity that covers typical residual ionospheric errors for nominal days. Extensive data-processing computes TEC (total electron content) estimates from GNSS measurements collected from the Korean reference station networks. We use Klobuchar model as a correction to calculate residual ionospheric errors from TEC (total electron content) estimate. Finally, an exponential delay model for residual ionospheric errors is presented as a function of local time and satellite elevation angle.

• Korean Journal of Environmental Agriculture
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• v.9 no.1
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• pp.15-22
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• 1990

The efects of application time on the persistence of chlorothalonil in sesame plants and its persistence in soil were studied in the field. A procedure was used which permited the analysis of residues of Chlorothalonil (DACONIL 2787) in sesame(Sesamum indicum L.)and soil. The procedure was based on the multiresidue analytical method using an polarized acetonitrile solution or acidified acetone as the extracting solvent. The DACONIL 2787 is separated from the fat in the extracts by using an activated alumina and Florisil chromatogaphic column. Residues of DACONIL 2787 were determined by subjecting the alternate eluate from the Florisil column to gas chromatographic analysis(ECD). Residue of chlorothalonil in sesame are proved to 0.06 ppm for six sprays, 3rd day before harvest The half-life of chlorothalonil in soil proved to be 8.9 days and residues of chlorothalonil was only 0.03 ppm 100 days after application of 15 ppm.