The levels of migration of 1-hexene and 1-octene residues in PE (polyethylene) products were analyzed by Headspace gaschromatography (HSGC). A total of 21 samples were including lap, polyglove, zipper bag and ect. The samples were eluted with distilled water, 4% acetic acid, 20% ethanol and n-heptan. The limit of detection (LOD) was 0.06 mg/L ~ 0.30 mg/L and limit of quantitation (LOQ) was 0.21 mg/L ~ 1.01 mg/L, respectively. But beacause of the high volatile, n-heptan elution was not detected 1-hexene and 1-octene standard. 1- hexene and 1-octene were not detected in the sample which eluted with simulant at 60℃, 30min. Microwave for 1 minute also treated sample and direct heated at 100℃ wthiout simulant were not detected.

21종류의 폴리스티렌 용기를 대상으로 용출조건에 따른 용기내 증류수로 용출되는 5종의 VOCs(톨루엔, 스티렌, 에틸벤젠, 이소프로필벤젠 및 n-프로필벤젠)를 Purge&Trap 장치를 연결하여GC-FID로 분석하였다. 각 표준물질은 1~50 ng/ mL의 농도범위에서 직선성(r2 =0.9976~0.9995)을 나타냈으며, 검출한계는 0.041~0.092 ng/mL, 정량한계는 0.135~0.304 ng/mL 이었다. 용출조건은 첫째, 60oC에서 30분, 둘째, 95oC에서 30분, 셋째, 실생활에서 컵라면 섭취시를 고려하여 끓은 물을 부은 후 뚜껑을 덮고 3분간 유지한 다음 뚜껑을 열고 5분 동안 개방하여 용출시키는 것으로 설정하였다. 톨루엔, 에틸벤젠, 이소프로필벤젠 및 n-프로필벤젠은 평균용출량이 모든 조건에서 5 ng/mL 이하로 검출되었으며 스티렌의 경우는 60oC에서 평균용출량이 4.02 ng/mL, 95oC에서는 52.71 ng/mL, 컵라면 섭취시의 조건에서는 17.23 ng/mL로 검출되었다.

This study was performed to investigate 172 samples of fried food in fast food store. The free fatty acid value of 22 samples exceeded standard of fried-food. These samples were 10 fried chickens, 6 fried potatoes and 5 fried onions. Fatty acid composition differed from each company. The correlation between free fatty acid value and double bond index was very low. New standard of fried food in fast food store is needed for thorough hygiene management, because of being not existed standard. The fried potato containing many carbohydrate and fat appeared higher calory than fried chicken containing many protein. The fried food had high fat comparatively, so that attention in regard to excess intake is demanded. The trace materials were included Mg, Ca, Mn, Fe, Zn, Cu and Cr in order of quantity, and the harmful heavy metals - Pb, Hg and Cd - were included small quantity.

(x=0.69~0.74) powders synthesized by the thermal decomposition of organic acid salts. The obtained powders were uniform in composition and ultra-fine particle with about 400 nm. The amount of spinel phase of these powders was about 50% in X-ray diffraction patterns. The calcination of powder was carried out at for 2 hours in air. After the powders were calcined. the mean size of powder was about 500 nm and the amount of spinel phase was increased over about 65%. The maximum amount of spinel phase was about 75% in the specimen of X=0.72. The magnetic properties of calcined powders were the best among the different among the different compositions

Dispersions of non-soluble ceramic particles in a metallic matrix can enhance the strength and heat resistance of materials. With the advent of mechanical alloying it became possible to put the theoretical concept into practice by incorporating very fine particles in a flirty uniform distribution into often oxidation- and corrosion- resistant metal matrices. e.g. superalloys. The present paper will give an overview about the mechanical alloying technique as a dry, high energy ball milling process for producing composite metal powders with a fine controlled microstructure. The common way is milling of a mixture of metallic and nonmetallic powders (e.g. oxides. carbides, nitrides, borides) in a high energy ball mill. The heavy mechanical deformation during milling causes also fracture of the ceramic particles to be distributed homogeneously by further milling. The mechanisms of the process are described. To obtain a homogeneous distribution of nano-sized dispersoids in a more ductile matrix (e.g. aluminium-or copper based alloys) a reaction milling is suitable. Dispersoid can be formed in a solid state reaction by introducing materials that react with the matrix either during milling or during a subsequent heat treatment. The pre-conditions for obtaining high quality materials, which require a homogeneous distribution of small dis-persoids, are: milling behaviour of the ductile phase (Al, Cu) will be improved by the additives (e.g. graphite), homogeneous introduction of the additives into the granules is possible and the additive reacts with the matrix or an alloying element to form hard particles that are inert with respect to the matrix also at elevated temperatures. The mechanism of the in-situ formation of dispersoids is described using copper-based alloys as an example. A comparison between the in-situ formation of dispersoids (TiC) in the copper matrix and the milling of Cu-TiC mixtures is given with respect to the microstructure and properties, obtained.