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최광순,정광모 한국통신학회 2004 정보와 통신 Vol.21 No.3
특정 소수에서 사용되던 인터넷이 불특정 다수의 사람들에게 장소에 구애받지 않고 점차 확산 되어 오면서 사용자의 요구 및 그 시장 역시 기하급수적으로 증가해왔다. 처음에는 단순히 접속 속도 향상에서부터 현재는 무선이라는 접속방법의 발전까지 사용자의 편의를 위한 기술 개발 노력은 결실을 맺고 있다고 해도 과언이 아니다. 최근에는 댁내까지 서비스되는 PC 중심의 인터넷 기술뿐만 아니라 다른 가전기기를 통한 통신 및 가전기기의 제어 및 모니터링 등 좀더 사용자 편리성을 강조한 삶을 영위하고자 하는 욕구가 점차 증가하고 있다.(중략)
최광순,이창현,박영재,조기수,김원호,Choe, Gwang Sun,Lee, Chang Hyeon,Park, Yeong Jae,Jo, Gi Su,Kim, Won Ho Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.8
A study has been carried out on the separation of gold, iridium, palladium, rhodium, ruthenium and platinum in chromite samples and their quantitative determination using inductively coupled plasma atomic emission spectrometry (ICP-AES). The dissolution condition of the minerals by fusion with sodium peroxide was optimized and chromatographic elution behaviour of the rare metals was investigated by anion exchange chromatography. Spectral interference of chromium, a matrix of the minerals, was investigated on determination of gold. Chromium interfered on determination of gold at the concentration of 500 mg/L and higher. Gold plus trace amounts of iridium, palladium, rhodium and ruthenium, which must be preconcentrated before ICP-AES was separated by anion exchange chromatography after reducing Cr(Ⅵ) to Cr(III) by H2O2. AuCl4- retained on the resin column was selectively eluted with acetone- HNO3-H2O as an eluent. In addition, iridium, palladium, rhodium and ruthenium remaining on the resin column were eluted as a group with concentrated HCl. However, platinum was eluted with concentrated HNO3. The recovery yield of gold with acetone-HNO3-H2O was 100.7 ${\pm}2.0%$, and the yields of palladium and platinum with concentrated HCl and HNO3 were 96.1 ${\pm}1.8%$ and 96.6 ${\pm}1.3%$, respectively. The contents of gold and platinum in a Mongolian chromite sample were 32.6 ${\pm}$ 2.2 ${\mu}g$/g and 1.6 $\pm$ 0.14 ${\mu}g$/g, respectively. Palladium was not detected.