Separation of strontium ion from synthetic seawater in the contained liquid membrane permeator with two micro-porous films was performed. The permeator consisted of a liquid membrane and two cells for aqueous solutions. The liquid membrane consisted of D2EHPA(di-2-ethylhexyl-phosphoric acid) and DCH18C6 (dicyclohexano-18-crown-6), diluted to 30 vol % with kerosine and was trapped between two micro-porous hydrophilic films. This liquid membrane separated two aqueous solutions, one of which was synthetic seawater and the other of which was the stripping solutions consisting of 1㏖/L H2SO4 Solution. The effects of various operating parameters on the extraction rate and equilibrium extraction ratio of strontium ion from synthetic seawater were experimentally examined. The addition of DCH18C6 to the D2EHPA solution caused synergy effect on the extraction of strontium ion. The permeator extracted strontium ion from synthetic seawater effectively with high membrane life time.

For the purpose of development of a liquid membrane permeator which separates metal ions from aqueous solutions continuously and effectively, a continuous membrane permeator with the membrane solution trapped between extraction and stripping phases by two micro-porous hydrophilic films was manufactured. Experimental researches on the separation of zinc ion from aqueous solutions were performed in the liquid membrane permeator with 30 vol % D2EHPA solution in kerosine as liquid membrane. As results, the liquid membrane permeator separates zinc ion from aqueous solutions continuously and effectively in the wide range of operating conditions. A simple mass transfer rate model using equilibrium constant of the extraction reaction for the system used were proposed, and the model was compared with experimental results of separation of zinc ion in the permeator. And the effects of operating factors, such as space time, pH of extraction solution, extraction temperature, on the separation rate of zinc ion in the permeator were experimentally examined.

경제적이면서 효과적인 항균성 필름의 생산방법으로서 corona 저려한 저밀도 폴리에틸렌 (LOPE) 필름에 천연항균성 물질을 코팅하는 방법을 개발하고, 이를 딸기의 포장에 적용하였다. 보다 안정한 항균제 코팅 필름의 생산을 위하여 결착제와 함께 코팅한 필름의 생산방법을 검토한 결과, polyamide수지용 과 항균생 물질을 함께 코팅함에 의하여 안정한 코팅을 행성할 수 있었다. 이의 항균성을 미생물 평판 배지 상에서 확인한 결과, 1% 자몽종자추

To develop a wrapping film, which suppresses the microbial decay through the storage and distribute of greenhouse fresh produce, the antimicrobial packaging films were made and applied to the preservation of grapes(Campbell early). For the purpose the films were made by adding 1% grapefruit seed extract(GFSE) to LDPE film(Control). Graps were separately wrapped with packaging films in the state of closely-adhered packaging as well as modified atmosphere packaging(MAP). The wrapped grapes were stored at 5 for 65 days and then the colony count of contaminated microorganims, decay ration of grapes, the gas component within the packages and chemical qualities were investigated. The antimicrobial film packaging showed the efficient results to suppress microbial growth as compared with control. The total number of containated microorganisms were decreased gradually through all the storage period. In the closely-adhered packaging and MAP the decay ratios of grapes was 31% and 19%, indivisually. After the storage period of 65 days, the interior gas components of MAP were 4.5% of O2 and 17.6% of CO2, which were efficient for the storage of grapes. In addition, no negative effects in sweetness and acidities occurred.

To prolong the shelf life of green chili pepper, packaging films such as 30 low density polyethylene(LDPE), 20 perforated polyolefin (SM250), 30 cast polypropylene (CPP) and 15 polyolefin (MPD) were used. LDPE showed a suitable gas concentration which consisted of 3-5% O and below 5% COfor keeping quality of green chili peppers after 10 days. Though weight loss was 9.3% for SM250 after 5 days, others showed below 2.0% weight loss after 40 days. Green chili peppers inside CPP package revealed a great decrease in ascorbic acid content after 30 days. SM250 showed a less total microbial count among packages, but there was no great differences among packages.

1. 수도묘의 초장 및 제3엽초의 신장은 청색필림에 의하여 억제되였고 적색필림에 의하여 촉진 되었다. 2. 수도묘 엽신의 엽록소함량과 전질소함량은 청색필림에 의하여 증가되었다. 3. 청색필림과 적색필림에 대한 수도묘 생육반응은 품종간에 차이가 있었다. 4. Etiolate된 수도묘 엽신의 엽록소형성은 PVC-CL 보다 PVC-B20필림에 의하여 촉진되었다. 5. 육묘의 피복자재는 백색 혹은 투명필림보다 청색필림이 효과적이라고 생각한다.