• 약학회지
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• 제50권3호
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• pp.154-159
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• 2006

For the increasing demand for the validation of analytical results, one of the important concerns of the analyst is to be assured that the instrumentation is working to qualified conditions. In this study, we have investigated and compared several validation guidelines of the performance verification of UV-VIS spectrophotometer used in pharmacopoeias of major countries and UV-VIS instrument analytical companies, and we proposed the practically useful validation guidelines of UV-VIS spectrophotometer. Based on our proposed validation guidelines of UV-VIS spectrophotometer, several UV-VIS spectrophotometers used in drug manufacturing laboratories were validated for their performances.

• 분석과학
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• 제5권1호
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• pp.7-15
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• 1992

게르마늄을 Phenylfluorone과 착물을 만들어 과염소산 지지전해질에서 Linear Sweep Voltammetry에 의해 정량하고, 염산용액 중에서 형성된 착물을 UV-VIS Spectrophotometry로 정량한 결과를 비교하였다. 이때 전기화학적인 방법의 경우 정량범위가 $2.5{\sim}80{\mu}g/L$이었고, 분광광도법의 경우는 $10{\sim}300{\mu}g/L$이었다.

• Tribology and Lubricants
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• 제35권3호
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• pp.151-157
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• 2019

Insulated oil degradation produces charged by-products, such as acids and hydro-peroxides, which tend to reduce the insulating properties of the oil. In this study, UV-vis spectroscopy measurement technology is developed and experimentally compared with other measurement methods, such as the titration method and IR spectroscopy, to validate its ability to monitor the degradation of electrical insulating paper. The degradation characteristics of the insulating paper are appropriately represented through various types of measurement methods, such as the Tan (delta) method, $CO_2$ gas production measurement, the titration method, and IR spectroscopy. The results are demonstrated to be well comparable to a change in the fluorescence emission ratio (FER), which is defined as the shift in fluorescence intensity in the measured wavelength range, and also to the chromatic ratio, which is defined as a color shift to longer wavelength ranges. The results also show that, by using UV-vis spectroscopy, it is possible to detect the degradation of the insulating paper. This study suggests that UV-vis spectroscopy can be applied as an alternative to high-performance liquid chromatography, which is the internationally recognized measurement technology for cellulose paper degradation. The FER detector is also verified to be useful as an effective condition-monitoring device for power transformers.

• 분석과학
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• 제7권1호
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• pp.17-23
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• 1994

졸-겔법에 의해 dye host로 사용될 수 있는 무기/유기 복합체(ORMOSIL)를 제조하였으며, 이 복합체가 dye host로 적합한 조건을 갖췄음을 UV/VIS Spectrophotometer를 이용하여 90% 정도의 투광성을 얻음으로써 알 수 있었다. 이 투광성은 졸-겔 공정 중 촉매로 쓰이는 염산의 양이 적고 묵힘시간이 짧을수록 커짐을 알 수 있었다. 또한 이렇게 제조된 Host에 Rhodamine 6G Perchlorate를 도핑하여 유기염료의 형광 및 투광성을 측정한 결과 겔화온도가 증가될수록 형광 강도가 증가하며 투광성은 감소하는 것을 관찰할 수 있었다.

• 산업기술연구
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• 제18권
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• pp.417-423
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• 1998

Experiments were performed to evaluate UV/VIS absorbance and TOC of humic acid solutions which were ozonated at different pH values. The optimum conditions for ozonation of humic acid from this study are pH 9 (buffered) and 0.84 ($H_2O_2/HA$, w/w) for $H_2O_2$ dosage.

• 한국응용과학기술학회지
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• 제17권4호
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• pp.273-278
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• 2000

Cellulose tosylate(CT) was prepared by reaction of cellulose with p- toluenesulfonylchloride in DMAc/LiCl homogeneous system. In order to study a reversible photoisomerization of disperse red 1(DR-1) attached on natural polymer, cellulose tosylate containing DR-1(DR-1/CT adduct) was prepared at $110^{\circ}C$ in DMAc, and the changes of UV/Vis spectra of its solutions and thick film were investigated by alternate irradiation technique. Form the UV/Vis spectra of DR-1/CT adduct dissolved in cosolvents, such as DMAc, DMAc/THF, DMAc/benzene, and DMAc/chloroform and irradiated with 360 nm and 450 nm ligths, we found out changes of UV/Vis spectra were reversible in all solvents systems and we found out changes of UV/Vis spectra were reversible at thick film, also.

• 한국작물학회지
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• 제48권5호
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• pp.369-371
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• 2003

Cyanidin 3-glucoside (C3G) content contained in the grains of blackish purple rice varieties, Heugjinjubyeo, Kilimheugmi, Heugnambyeo, Sanghaehy-anghyeolla, and the progenies derived from their crosses was evaluated by HPLC and UV-Vis spectroscopy. C3G content was higher in the range of 10-30% by using UV-Vis method compared to HPLC method. A significant linear relationship was, however, observed between two analytical methods. The correlation coefficient was 0.98. Thus, this results suggested that it would be able to use UV-Vis spectroscopy to determine C3G content which does not demanded precise value like selection.

• Bulletin of the Korean Chemical Society
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• 제32권5호
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• pp.1657-1661
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• 2011

In this study, CdSe-$TiO_2$ photocatalyst were synthesized by a facile solvothermal method and characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and UV-vis diffuse reflectance spectrophotometer. The photocatalytic activity was investigated by degrading methylene blue (MB) in aqueous solution under irradiation of UV light as well as visible light. The absorbance of degraded MB solution was determined by UV-vis spectrophotometer. The results revealed that the CdSe-$TiO_2$ photocatalyst exhibited much higher photocatalytic activity than $TiO_2$ both under irradiation of UV light as well as visible light.

• 분석과학
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• 제18권5호
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• pp.425-430
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• 2005

본 연구에서는 대기 중 암모니아 성분의 농도 계측에 활용하는 간이비색계의 성능을 UV/VIS 분광계에 대비하는 방식으로 평가하였다. 본 연구의 목적상 두 가지 분석 시스템을 이용하여 검출한계, 재현성, 직선성, 정확도 등의 기준항목을 다양하게 비교하였다. 본 연구에 의하면, 간이비색계의 성능은 대체로 UV/VIS 분광계와 양호한 일치도를 보일 정도로 좋은 결과를 보였다. 검출한계를 평가한 결과 두 가지 시스템 모두 $3{\mu}g$에 가깝게 나타났다. 그러나 간이비색계의 경우, 아주 낮은 농도와 고농도대에서 상대적으로 문제점이 존재하는 것으로 나타났다. 예를 들어, 암모니아의 절대량이 $10{\mu}g$ 이하일 때는 재현성에 대한 문제가 두드러졌고, $100{\mu}g$ 이상의 고농도대에서는 직선성이 제한되는 문제로 인해 분석이 어려웠다. 따라서 만약 대기시료를 30 리터 정도로 채취한다고 가정하면, (별다른 희석을 가하지 않고 분석한다면) 500 ppb에서 5 ppm의 농도대에서 간이비색계를 적용하는 것이 유효한 것으로 나타났다. 농도대에 따른 간이비색계의 제한적인 특성을 충분히 감안하고 사용할 경우, 간이비색계를 활용한 분석은 상당히 양호한 결과를 생산하는 것이 가능하다는 결론을 내릴 수 있다.

• 한국염색가공학회지
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• 제21권6호
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• pp.39-45
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• 2009

The importance of nano gold particles has been increased in the field of bio physics and medicine, recently. In this regard, the study aims to analyze how the harmless nano gold particles can be transformed by respective variables. In this study, electrospun PU nano-webs were impregnated with aqueous $HAuCl_4$ solution and UV light was irradiated on the webs. Au-ions were reduced to nano particles by photocatalytic reduction and these nano gold particles were characterized by SEM, UV-vis, Zetasizer, Spectrophotometer, EDS. $HAuCl_4$ solution concentration and UV irradiation time have heen examined to change the amount of absorption. Nano gold particles size and UV-Vis absorbances were increased with $HAuCl_4$ solution concentration and UV irradiation time.