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Zn<sub>2-2x</sub>Si<sub>1+x</sub>O<sub>4</sub> 세라믹스의 소결 및 마이크로파 유전 특성
윤상옥,김윤한,김소정,조소라,김신,Yoon, Sang-Ok,Kim, Yun-Han,Kim, So-Jung,Jo, So-Ra,Kim, Shin 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.7
Sintering and microwave dielectric properties of $Zn_{2-2x}Si_{1+x}O_4$ (x=0~0.10) ceramics were investigated. The secondary phase of ZnO was observed in the specimen for x=0 whereas $SiO_2$ was detected in that for x=0.05. The composition of $Zn_2SiO_4$ might be close to x=0.02, i.e., $Zn_{1.96}Si_{1.02}O_4$; the ratio of Zn/Si is 1.922. The insufficient grain growth was observed in the specimen of x=0. For the specimens of $x{\geq}0.05$, the grain growth sufficiently occurred through the liquid phase sintering. The value of quality factor of all specimens was dependent on the x value, i.e., the ratio of Zn/Si, whereas that of dielectric constant was independent. Relative density, dielectric constant, and quality factor ($Q{\times}f$) of the specimen for x=0.05, i.e., $Zn_{1.9}Si_{1.05}O_4$, sintered at $1,400^{\circ}C$ were 96.5%, 6.43, and 115,166 GHz, respectively.
녹색꽃양배추, 양상추, 상추 수확 후 토양 중 농약의 잔류량 조사
손경애(Kyeong-Ae Son),김찬섭(Chan Sub Kim),이효섭(Hyo Sub Lee),이은영(Eun Young Lee),이희동(Hee Dong Lee),박성은(Sung-eun Park),이지원(Ji-won Lee),홍수명(Su-Myeong Hong),조범행(Buemhaeng Cho),김윤한(Yun-han Kim) 한국농약과학회 2020 농약과학회지 Vol.24 No.4
This study was carried out to confirm the necessity of a residual test after PLS because some pesticide components remain in the soil and are absorbed into the succeeding crop, which may exceed 0.01 mg/kg on a default MRL. Broccoli, head lettuce and lettuce were cultivated after applying pesticide granules according to the standards for safe use of pesticides, and pesticide residues in the soil and crops at harvest period were investigated. On the 31st day after granulation treatment, lettuce was planted. The soil was drip irrigation during the test period. The residual amounts of cadusafos in broccoli and pencycuron in head lettuce were less than 0.01 mg/kg of the quantitative limit, and fluopyram in broccoli and flutolanil in head lettuce exceeded 0.01 mg/kg in the reference amount and doubling treatment. The residual amount in the soil was 0.2-3.58 mg/kg, which was more than 40% of the theoretical treatment concentration. When the lettuce was planted on the 2nd day after the hexaconazole granule treatment, the residual amount was <0.01 mg/kg in harvest. But when the plot was drip-irrigated for 1 month after treatment and lettuce was planted on the 31st day, hexaconazole was 0.02 mg/kg in harvest. Through this test, it was confirmed that in the case of granules that were released slowly after treatment in the soil, a significant amount of pesticide could remain in the soil even if the pesticide was not detected in the crop. And if sufficient water is supplied to the soil, it is likely to be transferred to the succeeding crop. Therefore, it is considered that the plant back intervals and the MRL for the rotational crops on pesticides with a high possibility of remaining in rotational crops should be established through the pesticide residue test for succeeding crop.
입제 농약 처리 후 토양 혼화깊이에 따른 상추 중 hexaconazole, thifluzamide 잔류량 비교
손경애(Kyeong-Ae Son),김찬섭(Chan Sub Kim),이은영(Eun Young Lee),이희동(Hee Dong Lee),박성은(Sung-eun Park),이지원(Ji-won Lee),김이선(Leesun Kim),박지호(Jiho Park),박정훤(Jeong-Hwon Park),김윤한(Yun-han Kim) 한국농약과학회 2021 농약과학회지 Vol.25 No.4
This study investigated how the tillage depth in soil affected the residue of hexaconazole and thifluzamide in lettuce for understanding the appropriate pesticide residue management of the soil and crops. Lettuce (Lactuca sativa) was planted after the granule type of combined pesticides were applied to the soil and two different depths of tillage (Method 1 and 2) were performed in the soil. The soil was slightly turned over in 5 cm depth in the method 1. The soil was completely turned over in 15 cm depth in the method 2. The residue concentrations in lettuce leaves harvested at 19 or 27 days after planting were 0.02-0.05 mg/kg in the method 1 and 0.01-0.05 mg/kg in the method 2 for hexaconazole and <0.01-0.02 mg/kg in the method 1 and in the method 2 for thifluzamide. The residue concentrations of hexaconazole in lettuce from the method 1 were statistically higher than those from the method 2, but it could not be determined whether the residual concentrations of thifluzamide in lettuce were different between the two methods. In the lower leaves of lettuce harvested at 27 days after planting, hexaconazole remained at a level of 0.04-0.06 mg/kg in the method 1 and 0.02 mg/kg in the method 2. Meanwhile, the residual level of thifluzamide was 0.01-0.04 mg/kg, and was below the limit of quantitation (0.01m g/kg) in method 2. The maximum concentration of hexaconazole (0.06 mg/kg) and thifluzamide (0.04 mg/kg) in the lower part of leaves were twice higher than the average residues in all the edible leaves. In conclusion, the results showed that residues in lettuce may have been affected by the differences of tillage depth.
재배환경, 품종 및 가공 방법에 따른 고추와 고춧잎 중 농약의 잔류 특성
이희동(Hee-Dong Lee),유오종(Oh-Jong You),임양빈(Yang Bin Ihm),권혜영(Hye-Young Kwon),진용덕(Yong-Duk Jin),김진배(Jin-Bae Kim),김윤한(Yun-Han Kim),박승순(Seung-Soon Park),오경석(Kyeong-Seok Oh),고성림(Sung-Lim Ko),김태화(Tae-Hwa Kim) 한국농약과학회 2006 농약과학회지 Vol.10 No.2
Chlorothalonil and imidacloprid sprayed onto the green peppers were degraded more faster at outdoor than in greenhouse. These results were affected by dew and photodegradation, considering no rain during the experimental period. Chlorothalonil, esfenvalerate and imidacloprid in green pepper, green twist pepper and sweet pepper did not show any residual pattern, because green peppers are one of the continuous harvesting crops and pesticides could not be sprayed homogeneously on them. When green peppers were pickled with soy sauce and green twist peppers were fried with vegetable oil, the amounts of pesticides such as alpha-cypermethrin, bifenthrin, chlorfenapyr, esfenvalerate and imidacloprid were diminished to the levels of about 30~71 and 20~41%, respectively. Esfenvalerate and imidacloprid could not be detected in 2 month-old hot pepper paste. The removal rates of pesticide residues in leaves of green peppers were about 22~37% by washing, about 74~95% by parboiling, and about 17~55% by drying after parboiling.