Separation Of Iodide Research Articles

Electrochemical behavior and separation of iodide in molten LiF-NaF-KF melt

This work studied the electrochemical behavior of iodide in molten LiF-NaF-KF mixture and the separation of iodide from the molten salt at 973 K using a graphite working electrode. The cyclic voltammetry (CV) and chronoamperometry (CA) measurements indicated an anodic passivation layer was formed on the graphite electrode in this melt and the layer blocked the charge transfer across the electrolyte/electrode interface. However, the added I− ions could pass through the passivation layer and were oxidized at the graphite electrode. The characterization of the obtained products proved that iodide ions was efficiently oxidized to I2 gas during electrolysis. Furthermore, the graphite anode showed excellent stability without any obvious change in dimensions after electrolysis, which showed the high current efficiency of I2 evolution reaction. Thus, the graphite electrode was possible to be served as an excellent anode to separate other anions (such as Br) from molten fluoride salts.

Radio-iodide uptake by modified poly (glycidyl methacrylate) as anion exchange resin

Abstract Poly(glycidyl methacrylate) (PGMA) microspheres were prepared by radiation induced polymerization of glycidyl methacrylate (GMA) monomer. The factors affecting the degree of polymerization and yield (%) of PGMA such as type of solvent, monomer concentration, and irradiation dose were investigated. It was found that the PGMA yield (%) increases with increasing monomer concentration up to 50% and absorbed dose of 5 kGy. The resulting PGMA containing the epoxy group waschemically modified by hydroxyl amine to act as anion-exchange resin for uptake of 131I− ions. The modified PGMA (MPGMA) was characterized by Fourier transform infra-red (FT-IR) spectrophotometer, thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). I-131 is produced from the fission of U-235 with low-enrichment uranium (LEU) targets in the Egyptian Second Research Reactor (ETRR-2). Separation of iodide from the radioactive solution by batchwise and column techniques was employed to determine the adsorption capacity of the MPGMA. Quality control of 131I product solution and radiochemical purity was examined by using the ascending paper chromatography method. The uptake behavior of MPGMA towards 131I− ions were studied at different experimental conditions and achieved by X-ray fluorescence (XRF). The synthesized MPGMA showed good results as anion-exchange and an effective adsorbent for uptaking 131I− ions.

Optimizing Separation of Iodine from Halogen Interferences in Preparation for TIMS Analysis

Low-level analysis of radioiodine performed by TIMS requires an initial chemical separation from interfering higher electron-affinity halogens. Experiments using 125I and 36Cl tracers have shown that iodide can be selectively oxidized and purged from solution while the chloride remains in the solution. A systematic investigation of the experimental factors that affect the oxidation and transfer of iodine along with the separation of iodide from chloride has been completed. Experimental design was used to determine the optimum experimental conditions by obtaining a better understanding of factor affects and interactions. Factors such as gas purge rate, experiment run time, and oxidant concentration were simultaneously studied in a central composite design of experiments and response surfaces were generated from results. Optimizing experimental factors resulted in improved iodide oxidation and transfer efficiencies, halogen separation, and shorter analysis times.

Determination of Trace Iodide in Saturated Brine Using Ion Chromatography

A new method was developed for the determination of iodide in saturated brine after in-line pretreatment by ion chromatography with pulsed amperometric detection. IonPac Cryptand C1 column was used to concentrate iodide in saturated brine sample, which was subsequently rinsed with 10 mM NaOH to remove interfering chloride. Third, NaOH at 0.5 mM concentration was used to elute iodide from the concentrator column and refocus it on the head of the AG20 guard column. The separation of iodide was achieved on an IonPac AS20 column with 25 mM NaOH as eluent. The detection limit of iodide was 0.07 μg l −1 (50 μl injection, signal-to-noise ratio of 3) and the linear range of the calibration curve of peak height vs analyte concentration was from 5.0 to 1000 μg l −1. The relative standard deviation (RSD) of the peak height for 50 μg l −1 iodide was 1.0% ( n = 9).

Control of relative migration of small inorganic and organic anions with cyclodextrins in capillary electrophoresis (CE)

The capillary electrophoretic separation of iodide, nitrate, perchlorate, thiocyanate, bromate, iodate, and ethane-, butane-, pentane-, and octanesulphonate was examined in sodium chromate or potassium hydrogen phthalate electrolytes and in the presence of α -, γ -, (0-40 mmol/L) and β -cyclodextrin (0-10 mmol/L). Largest decreases in electrophoretic mobility were observed for iodide, perchlorate, and thiocyanate, probably due to inclusion of these anions in the cyclodextrin (CD) cavity. Changes in migration patterns and electroosmotic flow were observed, which depended on cyclodextrin type and concentration and on electrolyte-cyclodextrin interactions. Thus for larger cavity cyclodextrins ( β-or γ-cyclodextrin) or in the presence of chromate, relatively small decreases in electrophoretic mobilities for all the anions were observed, indicating that a good match between analyte and cavity size and minimal cyclodextrin affinity for electrolyte ions are essential for different migration patterns. Separation efficiencies were between 50 000 and 400 000 theoretical plates, and calibration plots for iodide and octanesulphonate were linear; R2 = 0.998 and 0.9999, respectively, in the concentration range (5 x 10-5)-(5 x 10-3) mol/L.Key words: capillary electrophoresis, inorganic and organic anions, cyclodextrins, inclusion complex, electroosmotic flow control.

Determination of Iodide in Seawater by Ion Chromatography

A simple and highly sensitive ion chromatographic method with UV detection was developed for iodide (I(-)) in seawater. A high-capacity anion-exchange resin with polystyrene-divinylbenzene matrix was used for both preconcentration and separation of iodide. Iodide in artificial seawater (salinity, 35‰) was trapped quantitatively (98.8 ± 0.6%) without peak broadening on a preconcentrator column and was separated with 0.35 M NaClO(4) + 0.01 M phosphate buffer (pH 6.1). On the other hand, the major anions in seawater, chloride and sulfate ions, were partially trapped (5-20%) and did not interfere in the determination of I(-). The detection limit for I(-) was 0.2 μg/L for 6 mL of artificial seawater. The present method was applied to determination of I(-) (ND - 18.3 μg/L) and total inorganic iodine (I(-) + IO(3)(-) - I, 50.0-52.7 μg/L) in seawater samples taken near Japan.

Separation of iodide and iodate by anion exchange resin and determination of their ions in surface water.

雨水,河川水,水道水中のヨウ化物イオン及びヨウ素酸イオンの分離定量法を検討した.ヨウ化物イオンの定量は,これを陰イオン交換樹脂に吸着させ,過マンガン酸カリウムを含むアルカリ溶液でヨウ素酸イオンとして分離溶出し定量した.ヨウ素酸イオンの定量は,亜硫酸でヨウ化物イオンに還元し,もともと存在するヨウ化物イオンと併せて定量し,この値からヨウ化物イオンの値を差し引いて求めた.ヨウ化物イオンの比色定量は,高感度であるロイコクリスタルバイオレット法を応用した.雨水,河川水,水道水には,ヨウ化物イオン及びヨウ素酸イオンを含むが,特に水道水のヨウ素は,ほとんどすべてがヨウ素酸イオンとして存在することを明らかにした.

Comparison of 125I-labelling of polypeptides using chloramine-T and 1,3,4,6-tetrachloro-3α,6α-diphenyl-glycoluril (iodogen®) with subsequent separation of iodide and labelled protein on cation-exchange dextran

Comparison of 125I-labelling of polypeptides using chloramine-T and 1,3,4,6-tetrachloro-3α,6α-diphenyl-glycoluril (iodogen®) with subsequent separation of iodide and labelled protein on cation-exchange dextran

Separation of iodides, tellurites and tellurates by extraction with ethyl acetate-methyl isobutyl ketone mixtures

Separation of iodides, tellurites and tellurates by extraction with ethyl acetate-methyl isobutyl ketone mixtures

Electrophoretic and Chromatographic Separation of Iodide, Iodate, Tellurite and Tellurate

Two procedures for separation of iodine and tellurium anions are described. Electrophoresis and paper chromatography were used to study the radioactive and radiochemical purity of carrier free Na131J solution.

Separation of iodine anions by glass fibre paper chromatography

The separation of iodide, iodide, iodate and periodate by chromatography on glass fibre paper with different eluants is investigated. Cellulose papers are unsatisfactory for trace-scale separations of periodate because the bulk of the periodate is reduced, probably to iodate.

Selective precipitation of silver halides from homogeneous solution. Separation of iodide, bromide, and chloride using volatilization of ammonia

Selective precipitation of silver halides from homogeneous solution. Separation of iodide, bromide, and chloride using volatilization of ammonia

Studies on Analysis with Convection Electrede. II. Scanning of the Effluent from the Column of Ion-exchange Resins by Convection Electrode (Separation of Iodide and Bromide Ions)

イオン交換樹脂柱(Amberlite IRA-400,120～140メツシュ,4cm1×7cm,NO3-形)にBr-0.3mmolおよびI-0.1mmolを吸着させ,2mo1/l硝酸カリウム溶液で溶離するとき,さきに著者らが試作した白金線対流電極を用いて各イオンの溶出状態を追跡した。溶離曲線は普通の方法によるものとほぼ同様で,流速の変化による影響は少ないが,かきまぜの影響が認められた。本電極による溶離曲線の山の高さおよび面積の再現性は十分ではないが,流動液に対して比較的簡単でかつきわめて敏鋭なモニターとして使用し得ることを知った。

第一銅塩による沃化物と塩化物の分析的分離について (第2報)

第一銅塩による沃化物と塩化物の分析的分離について (第2報)

Separation of iodide, bromide, and chloride from one another and their subsequent determination

Separation of iodide, bromide, and chloride from one another and their subsequent determination

第一銅塩による沃化物と塩化物の分析的分離について

第一銅塩による沃化物と塩化物の分析的分離について

Report on Separation of Iodides, Bromides, and Chlorides

Report on Separation of Iodides, Bromides, and Chlorides