• 분석과학
• /
• 제12권6호
• /
• pp.528-533
• /
• 1999

유도결합 플라스마-질랑분석법을 이용하여 혈청, 생우유 및 사료첨가제 중 요오드를 정량하였다. 시료를 매트릭스 변형제인 $NH_4OH$(0.5% v/v)+$CH_3OH$(5% v/v) 혼합용액으로 25배 묽힌 다음, m/z=127에서 이온세기를 측정하였다. 이 방법에 대한 요오드의 검정곡선은 $0-100{\mu}g/L$ 범위에서 상관계수($R^2$)가 0.99인 직선관계를 나타내었으며, 검출한계는 $0.084{\mu}g/L$이었다. 최적 분석 및 기기 조건에서 분유 표준시료를 분석한 결과 상대오차는 2.30-4.73% 범위이었다. 또한 혈청, 생우유, 동물의 사료 첨가제 등과 같은 실제시료를 분석한 결과 요오드의 함유량은 각각 $12.4-40.2{\mu}g/L$, < 0.01-3.11 mg/L,< $10^{-7}-2.60g/kg$ 범위이었다.

• 대한화학회지
• /
• 제29권6호
• /
• pp.575-581
• /
• 1985

벤젠, 나프탈렌 및 페난스렌과 요오드 사이의 각계를 사염화 탄소 용액에서 자외선 분광광도법에 의하여 연구한 결과 1:1분자 착물이 형성됨을 알았다. 이들 착물 생성에 의한 흡수 최대는 온도가 상승함에 따라 blue shift되므로 이에 따른 각 온도에서의 평형 상수를 구하였다. 이 값으로부터 이들 착물 생성에 대한 열역학적 파라미터를 산출한 결과 각 온도에서 여러 고리 방향족화합물과 요오드 사이에 생성된 착물의 상대적 안정도는 방향족 고리의 수가 증가함에 따라 증가함을 알 수 있다. 이러한 사실을 요오드에 대한 여러 고리 방향족 화합물들의 상대적 염기성도를 나타내며 방향족 화합물과 요오드 사이의 상호작용에 관한 공명현상에 의하여 설명할 수 있다. 그리고 이 계열의 연구결과를 폴리메틸 벤젠계열의 연구결과와 비교 고찰하였다.

• Bulletin of the Korean Chemical Society
• /
• 제10권5호
• /
• pp.426-430
• /
• 1989

Two crystal structures of iodine sorption complexes of dehydrated partially Co(Ⅱ )-exchanged zeolite A, $Co_{3.5}Na_5-A{\cdot}xI_2$, x = 2.5 and 5.0, have been determined by single crystal X-ray diffraction techniques. Both structures were solved and refined in cubic space group, Pm3m at $21(1)^{\circ}C$. The structures of $Co_{3.5}Na_5-A{\cdot}2.5I_2$(a = 12.173(1) ${\AA}$) and $Co_{3.5}Na_5-A{\cdot}5.0I_2$(a = 12.130(1) ${\AA}$) were refined to the final error indices, $R_1$ = 0.081 and $R_2$ = 0.077 with 261 reflections and $R_1$ = 0.103 and $R_2$ = 0.112 with 225 reflections, respectively, for which I>3${\sigma}$(I). In both structures, 3.5 $Co^{2+}$ ions and 4.5 $Na^+$ ions per unit cell lie at two crystallographically different 6-ring positions. 0.5 $Na^+$ ion lines in an 8-oxygen ring plane. Dehydrated $Co_{3.5}Na_5$-A sorbs 2.5 iodine molecules per unit cell at $70^{\circ}C$ (vapor pressure of $I_2$ is ca. 8.3 torr) within 30 minutes and 5 iodine molecules per unit cell at $80^{\circ}C$ (vapor pressure of $I_2$ is ca. 14.3 torr) within 24 hours. Each iodine molecule makes a close approach, along its axis to framework oxygen atom with I-I-O = $175^{\circ}$.

• 한국응용과학기술학회지
• /
• 제35권4호
• /
• pp.1031-1037
• /
• 2018

수용성 비이온고분자인 Polyvinylalcohol (PVA), Polyvinylpyrrolidone (PVP), Hydroxypropyl cellusoe (HPC)와 iodine과의 착물 형성에 대한 계면활성제의 영향을 알아보기 위해 Sodiumdodecylsulfate을 포함하는 수용액에서 이들 사이의 반응을 수행하였다. PVP와 HPC에서 tri-iodide band의 적색 이동에 의하여 착물이 만들어졌다는 것을 알게되었고, PVA-iodine 착물에서는 500 nm 부근에서 고유의 특색있는 띠를 나타내었다. SDS 계면활성제의 존재는 PVA-iodine 착물의 파괴를 가져왔고, 고유의 푸른색도 사라지게 만들었다. 그러나 SDS 단량체는 PVP, HPC와 iodine의 착물 형성을 도와주는 경향을 나타내었다. 고분자 용액에서 겔이 만들어지는 것을 방해하는 n-propanol은 고분자-iodine 착물이 형성되는 것을 도와주었다. SDS가 있을 때와 없을 경우의 영향을 알아보기 위해 순수한 HPC와 HPC-iodine 착물을 만들고 이들의 성질을 조사하였다.

• Archives of Pharmacal Research
• /
• 제14권3호
• /
• pp.249-254
• /
• 1991

Activated carbons from rice-straw can be used as an adsorbents for the purification of water were prepared and evaluated. The adsorptive capacities of activated carbons were measured by iodine, potassium permangante, phenol and metals. It was observed by electron microscope (SEM) and IR spectrum that organic components in the rice-straw and its carbonization product were disappeared. Slit-shaped and porousstructures were formed by activation. There was no relationship between temperature and adsorption of iodine but adsorption of potassium permanganate increased as temperature rose. The adsorption of the phenol was greater than 99%. The adsorption data of phenol at $25^\circ{C}$ obeyed the Freundlich's isotherm. Various metals except sodium were not removed by activated carbon.

• 대한화학회지
• /
• 제9권2호
• /
• pp.110-112
• /
• 1965

액체 요오드의 표면장력을 측정하기 위하여 새로운 장치를 고안하고 differential capillary rise method를 써서 $125.0^{\circ}C,\;135.0^{\circ}C,\;145.0{\circ}C$ 및 $155.0^{\circ}C$ 에서 각각 36.88, 35.87, 34.83 및 34.04 dye/cm의 값들을 얻었다. 이 측정된 값들로부터 Eotvos 상수를 구해본 결과 각 온도에서 비슷한 값을 보여주고 있음을 알았다.

• Bulletin of the Korean Chemical Society
• /
• 제35권7호
• /
• pp.2172-2174
• /
• 2014

• 대한화학회지
• /
• 제6권1호
• /
• pp.69-72
• /
• 1962

Spectrophotometric studies have been made on the solutions of elementary iodine in pyridine and quinoline, in the absence of light. The results shown that triiodide ion is produced in both solutions with different rates, and that triiodide ion behaves differently in both solutions. Iodine reacts slowly with pyridine, giving rise to triiodide ion, which is relatively stable in this solvent, hereas, iodine reacts rapidly with quinoline, forming triiodide ion, which interacts further with the medium at slow rate. It has been thought that the difference of the behavior of triiodide ion in both solutions may be due to the stronger basicity of quinoline than pyridine.

• 한국수소및신에너지학회논문집
• /
• 제17권4호
• /
• pp.395-402
• /
• 2006

Iodine-sulfur(IS) hydrogenation production process consists of three sections, which are so called a Bunsen reaction section, a HI decomposition section and a $H_2SO_4$ decomposition section as a closed cycle. For highly efficient operation of a Bunsen reaction section, we investigated the phase separation characteristics of $H_2SO_4-HI-H_2O-I_2$ system into two liquid phases($H_2SO_4$-rich phase and $HI_x$-rich phase) in the high temperature ranges, mainly from 353 to 393 K, and in the $H_2SO_4/HI/H_2O/I_2$ molar ratio of $1/2/14{\sim}30/0.3{\sim}13.50$. The desired results for the minimization of impurities in each phase were obtained in conditions with the higher temperature and the higher $I_2$ molar composition. On the basis of the distribution of $H_2O$ to each phase, it is appeared that the affinity between $HI_x$ and $H_2O$ was more superior to that between $H_2SO_4$ and $H_2O$.

• Journal of Electrochemical Science and Technology
• /
• 제14권1호
• /
• pp.21-30
• /
• 2023

This work presents a correlation between the behavior of formic acid oxidation (FAO) on various Bi-modified Pt(poly) disk electrodes and their morphologies observed on Bi-modified Pt(111) disk electrodes using electrochemical scanning tunneling microscopy (EC-STM) to understand the effects of Bi on Pt. To distinguish the FAO activities of Bi on Pt and plain Pt around Bi, additional Pt was intentionally deposited using two different routes: direct route and iodine route. In direct route, Pt was directly deposited on Bi islands and plain Pt sites around Bi islands, while in iodine route, Pt was exclusively deposited on Bi islands by protecting plain Pt sites with adsorbed iodine. Thus, a comparison of FAO performances on the two Bi-modified Pt electrodes with additional Pt (deposited in the different ways) disclosed a difference in FAO performances on plain Pt sites and Bi islands. When Bi coverage was ~0.04, the Bi deposits were scattered Bi islands enhancing FAO on Pt(poly). The additional Pt deposits using direct route increased FAO efficiency, while the ones using iodine route slightly decreased FAO current. The EC-STM observations indicated that Pt deposits around Bi islands, not on Bi islands, were responsible for the FAO current increase on Bi-modified Pt(poly). The FAO efficiency on Bi-modified Pt(poly) with a Bi coverage of ~0.25 increased by a factor of 2. However, the additional Pt deposits using the two Pt deposition routes notably decreased the FAO current. The dependency of FAO on Bi coverage was discussed in terms of electronic effect and ensemble effect.