• Nuclear Engineering and Technology
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• 제32권5호
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• pp.504-513
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• 2000

The adsorption characteristics of methyl iodide generated from the simulated off-gas stream on various adsorbents such as silver ion-exchanged zeolite (AgX), zeocarbon and activated carbon were investigated. An extensive evaluation was made on the optimal silver ion-exchanged level for the effective removal of methyl iodide at temperature up to 38$0^{\circ}C$. The degree of adsorption efficiency of methyl iodide on silver ion-exchanged zeolite is strongly dependent of silver ion-amount and process temperature. The influence of temperature, methyl iodide concentration and silver ion-exchanged level on the adsorption efficiency is closely related to the pore characteristics of adsorbents. It would be facts that the effective silver ion-exchanged level was about 10 wt%, based on the degree of silver utilization for the removal of methyl iodide.

• 방사성폐기물학회지
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• 제9권1호
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• pp.33-40
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• 2011

[ $Ag_2O$ ] 첨가한 압축 벤토나이트에 대하여 관통 확산법으로 요오드 이온의 이동 특성을 관찰하였다. $Ag_2O$를 첨가하지 않은 압축 벤토나이트와 마찬가지로 $Ag_2O$를 첨가한 압축 벤토나이트에서도 요오드 이온은 확산에 의하여 이동하는데, $Ag_2O$를 첨가한 압축 벤토나이트는 $Ag_2O$를 첨가하지 않은 압축 벤토나이트에 비하여 요오드 이온의 초기 누출 시간이 지연되는 것으로 나타났다. $Ag_2O$를 첨가한 압축 벤토나이트에서 요오드 이온의 초기 누출 시간 지연은 확산 용액으로 순수 요오드 이온 수용액을 사용하였을 때 뿐만 아니라 0.1 M NaCl-요오드 이온 수용액을 사용하였을 때에도 관찰되었다. 또한 $Ag_2O$를 첨가한 압축 벤토나이트의 겉보기 확산 계수는 $Ag_2O$를 첨가하지 않은 압축 벤토나이트의 겉보기 확산 계수보다 낮은 값을 나타내었다. $Ag_2O$를 첨가하지 않은 압축 벤토나이트의 유효 확산 계수는 기존 문헌에 보고된 값과 거의 일치하는 결과를 얻었으며, $Ag_2O$를 첨가한 압축 벤토나이트에서 요오드 이온의 유효 확산 계수는 $Ag_2O$ 첨가에 따라 대체적으로 감소하는 경향을 나타내었다.

• Nuclear Engineering and Technology
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• 제46권1호
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• pp.93-100
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• 2014

The paper deals with the application of radio isotopic non-destructive technique in the characterization of two industrial grade anion exchange resins Indion GS-300 and Indion-860. For the characterization of the two resins, $^{131}I$ and $^{82}Br$ were used as tracer isotopes to trace the kinetics of iodide and bromide ion-isotopic exchange reactions. It was observed that the values of specific reaction rate ($min^{-1}$), amount of iodide ion exchanged (mmol), initial rate of iodide ion exchange (mmol/min) and log $K_d$ were calculated as 0.328, 0.577, 0.189 and 19.7 respectively for Indion GS-300 resin, which was higher than the respective values of 0.180, 0.386, 0.070 and 17.0 calculated for Indion-860 resins when measured under identical experimental conditions. Also at a constant temperature of $40.0^{\circ}C$, as the concentration of labeled iodide ion solution increases 0.001 M to 0.004 M, the percentage of iodide ions exchanged increases from 75.16 % to 78.36 % for Indion GS-300 resins, which was higher than the increases from 49.65 % to 52.36 % compared to that obtained for Indion-860 resins. The overall results indicate that under identical experimental conditions, Indion GS-300 resins show superior performance over Indion-860 resins.

• Bulletin of the Korean Chemical Society
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• 제24권1호
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• pp.23-26
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• 2003

Titanium acetylacetonate was used in the construction of a PVC-based membrane electrode. This sensor shows very good selectivity for iodide ion over a wide variety of common inorganic and organic anions. It exhibits Nernstian behavior with a slope of 59.1 mV per decade. The working concentration ranges of the sensor are with a detection limit of $3.0\;{\times}\;10^{-6}\;M$. The response time of the sensor is very fast (<8 s), and can be used for at least twelve weeks in the pH range of 4.0-9.2. The best performance was obtained with a membrane composition of 30% PVC, 65% dibutylphthalate, 3% titanium acetylacetonate and 2% hexadecyltrimethylammonium bromide. The proposed sensor was successfully applied as an indicator electrode for titration of iodide with silver ion.

• Bulletin of the Korean Chemical Society
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• 제27권12호
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• pp.1985-1988
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• 2006

The polymeric membrane electrodes based on urea derivative as an ionophore were prepared and studied for the iodide-ion selective electrode. This membrane exhibits a linear stable response over a wide concentration range ($1.0\;{\times}\;10^{-5}\sim1.0\;{\times}\;10^{-2}$) with a slope of -57.7 mV/decade, a detection limit of log[$I^-$] = -5.63, and a selectivity coefficient for iodide against perchlorate anion (log$K^{pot}_{I^-,j}$ = -1.42). The selectivity series of the membrane gives the follow as $I^-$ > $SCN^-$, $Sal^-$ > $ClO_4^-$ > $NO_3^-$ > $Br^-$ > $NO_2^-$ > $Cl^-$ > $F^-$. The proposed electrode showed good selectivity and response for iodide anion over a wide variety of other anions in pH 5.0 buffer solutions.

• 분석과학
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• 제14권4호
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• pp.306-310
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• 2001

황상용액 매질에서 요오드 음이온을 흡착제에 흡착시킨 후 황산용액에 남아있는 요오드 음이온을 정량하기 위해 이온 크로마토그래피를 적용하였다. 산화제 작용을 하는 황산의 농도를 0.25 M, 0.5 M, 1 M로 변화시키고 요오드 음이온을 각각 첨가한 후 시간변화에 따라 요오드 음이온이 산화되는 정도를 측정하였다. 황산농도가 진할수록 요오드 음이온은 산화되어 휘발하므로 적게 검출되었다. 수산화나트륨 용액을 사용하여 환산매질을 중화하였다. 중화된 0.5 M $Na_2SO_4$ 매질 중 요오드 음이온의 농도범위가 0-20 mg/L인 구간에서 검정곡선의 직선성이 좋게 나타났다(r=0.99999).

• 한국표면공학회지
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• 제29권2호
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• pp.140-145
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• 1996

Silver deposits formed on copper substrates by replacement reactions show poor adhesion, and a silver film plated on such a deposit does not adhere. Silver ion makes a highly stable complex with cyanide ion, so that in a silver cyanide solution, the activity of silver ion is very small. This is one of the reasons for the universal use of cyanide baths in the industrial silver plating. However, the consideration of the difference between the values of the stability constants for bath the silver-iodide complex and the copper-iodide complex suggest that the rate of replacement deposition of silver on the copper substrate in si]ver-potassium iodide solution, could be comparatively low. To confirm this, the rate of replacement deposition of silver in both a silver-potassium iodide solution ($AgNO_3$0.10 mol/L, KI 2.00 mol/L ) and a strike silver plating bath (AgCN 0.028 mol/L, KCN 1.15 mol/L ) was estimated from the current density corresponding to the point of intersection of the anodic and the cathodic polarization curves. These estimated values were almost the same, and it is suggested that the silver-potassium iodide solution is not only a cyanide free silver plating bath capable of employing a copper substrate but a silver plating bath which requires no strike plating.

• 분석과학
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• 제13권3호
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• pp.304-308
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• 2000

모의사용후핵연료로부터 sodium bisulfite 수층에 회수된 요오드($I^-$)를 이온크로마토그래피법을 이용해 정량할 때, 0.1 M sodium bisulfite와 1 mM 질산의 영향 없이 미량 오오드(1ppm)를 정량하기 위한 방법을 검토하였다. AS4A-SC(DIONEX) 컬럼과 자외선검출기를 사용하였고 sodium bisulfite, 질산 및 요오드의 자외선 흡광도를 측정하여 요오드 정량에 적합한 흡수파장으로 230nm를 선택하였고 용리액 농도는 0.1 M NaCl이 효율적이었다. 이 조건에서 0-1,000ppb 범위의 검정곡선을 작성하였다. 이때 선형상환계수는 0.99993 이었으며 검출한계는 5 ppb였다. 상대표준편차는 1.26% 이었다.

• 분석과학
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• 제15권5호
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• pp.445-450
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• 2002

해수에 함유되어 있는 요오드화합물의 총량을 휘발성 유기물로 유도체화 후 측정하는 방법을 확립하였다. 이 방법은 요오드 음이온은 요오드로 산화시킨 후 2,6-dimethylphenol과 반응하여 4-iodo-2,6-dimethylphenol로 전환시켜 ethylether로 1단계 추출 후 gas chromatography-mass spectrometry (selected ion monitoring)로 측정하는 것으로 구성되어 있다. Iodate는 ascorbic acid 와 acetic acid로 요오드 음이온으로 환원시킨 후 요오드 음이온 측정법과 동일하게 수행하였다. 이 방법은 검출한계가 해수에서 0.1 ng/ml이었으며 검량선은 0.9997의 좋은 상관계수값을 보였다. 이 방법은 또한 재현성이 우수하고 간단하여 해수에 인체의 필수원소인 요오드를 낮은 농도까지 분석하는데 유용하게 사용될 수 있다고 사료된다.

• 약학회지
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• 제38권4호
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• pp.379-388
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• 1994

A new method for the analysis of metocurine iodide in biological fluids was developed. Metocurine iodide was quantitatively extracted with rose bengal from aqueous layer into dichloromethane layer and the amount of metocurine iodide was calculated from the amount of rose bengal which was determined by HPLC with fluorescence detector. It was possible to analyze metocurine iodide without the effect of co-prescribed drugs in the concentration range of $0.09{\sim}9.10\;{\mu}g/ml$. The detection limits of metocurine iodide in urine and blood were 0.8 and 1.2 ng at S/N=3, each respectively.