共查询到20条相似文献,搜索用时 46 毫秒
1.
T. I. Gorbovitskaya Yu. Yu. Tiliks V. P. Titaev Yu. E. Tiliks 《High Energy Chemistry》2001,35(3):161-165
Volatile compounds of radioactive iodine, including methyl iodide, are released into the environment in the cases of serious accidents at nuclear power plants. The aim of this study was to find a conceivable mechanism of the radiation-chemical formation of methyl iodide in aerated aqueous solutions of cesium iodide and acetic acid. This provides the basis for subsequent investigations aimed at preventing the formation of methyl iodide. The radiation-chemical yield of methyl iodide formation in 10–3M CsI solutions containing CH3COOH (0.1 mol/l) decreased with increasing the pH. This fact is primarily explained by a decrease in the steady-state concentration of molecular iodine with increasing the pH. An increase in the pH of irradiated solutions up to pH 9 was found not only to prevent the formation of methyl iodide but also to enhance its radiation-chemical degradation. 相似文献
2.
食品中碘的光谱电化学法测定 总被引:5,自引:1,他引:4
本文研究了用光谱电化学法测定食品中的碘,探讨了最佳的测定条件,用于海带,海带表层盐及模拟碘盐中碘的测定,结果满意,回收率高,抗干扰力强,操作快捷,方法简单易行。 相似文献
3.
Ferric iodide is isolated pure for the first time as a dark purple solid when a hexane solution of diiodotetracarbonyliron(II) and diiodine is exposed to actinic radiation. Its identity is confirmed by elemental analysis and quantitative conversion to the known tetraiodoferrate(III) by treatment with tetra-n-butylammonium iodide. Although persistent in the solid state, ferric iodide is readily decomposed in solution to ferrous iodide and 0.5 mol diiodine quantitatively. 相似文献
4.
Reaction of phenothiazine with methyl iodide in the presence of mercuric iodide did not yield a product with a methyl group attached to the sulfur atom. Instead, a quaternary ammonium salt was obtained. This paper is intended to provide correct information with supporting evidence for this raction. 相似文献
5.
E. Chmielewská-Horváthová J. Lesný 《Journal of Radioanalytical and Nuclear Chemistry》1995,200(4):351-363
The possibility to use the monoionic Ag+-form (eventually Hg+- and Hg2+- forms) of clinoptilolite of domestic origin for radioactive iodide elimination from waters has been studied. The capacity of the monoforms of clinoptilolite towards iodide exceeds many times that of the capacity of clinoptilolite in natural form. Due to the low solubility product of AgI, Hg2I2 and HgI2 iodides generate precipitates on the zeolite surface. Rtg analyses of the silver form of clinoptilolite after sorption of iodide demonstrate the formation of new crystals on the zeolite surface. The influence of interfering anions on the adsorption capacity of silver clinoptilolite towards iodide was investigated, too. Kinetic curves of iodide desorption from the surface of silver and mercury clinoptilolite were compared. Simultaneously, adsorption isotherms for the systems aqueous iodide solution/Ag–, Hg-clinoptilolite were determined. 相似文献
6.
Josue Valdes‐García Luis D. Rosales‐Vzquez Ivn J. Bazany‐Rodríguez Alejandro Dorazco‐Gonzlez 《化学:亚洲杂志》2020,15(19):2925-2938
This Minireview covers the latest developments of chemosensors based on transition‐metal receptors and organic fluorophores with specific binding sites for the luminescent detection and recognition of iodide in aqueous media and real samples. In all selected examples within the last decade (made‐post 2010), the iodide sensing and recognition is probed by monitoring real‐time changes of the fluorescence or phosphorescence properties of the chemosensors. This review highlights effective strategies to iodide sensing from a structural approach where the iodide recognition/sensing process, through supramolecular interactions as coordination bonds, hydrogen bonds, halogen bonds and electrostatic interactions, is transduced into an optical change easily measurable. The selective iodide sensing is an active field of research with global interest due to the importance of iodide in biological, medicinal, industrial, environmental and chemical processes. 相似文献
7.
A simple and specific method is described for the analysis of iodide in trace proportions. The method is based on the reaction of iodide with pentafluorobenzyl 5-dimethylamino-1-naphthalenesulfonate.in a biphasic system. The resulting derivative was determined on a gas chromatograph with a flame-ionization detector. The detection limit was about 8 nmol of iodide in 1.0 mL of aqueous sample (S/N = 2; sample size, 5 μL). Application of the method to the analysis of available iodine in povidone-iodine solution proved feasible. 相似文献
8.
《Analytical letters》2012,45(10):2353-2358
Abstract The determination of trace iodide by preconcentration using solvent sublation and subsequent spectrophotometric measurements is described using cetyltrimethylammonium bromide (CTMAB) as a collector. the optimum conditions and the influence of diverse ions1 along with the wavelength of maximum absorption, concentration range and statistics of the method are presented. the method is applied to the iodide content in sea-water and results are compared with the iodide-starch method. 相似文献
9.
《Analytical letters》2012,45(13):1339-1346
Abstract An iodide membrane electrode, in conjunction with rat liver microsomes, is used to measure thyroxine at sub-micromolar levels. The microsomes serve as biocatalytic reagents which selectively remove iodide from the hormone. The amount of iodide liberated, as measured by the electrode, is proportional to the initial thyroxine concentration. The electrode can further be employed to directly monitor the rate of deiodination of the hormone with advantages of speed and convenience over existing techniques. 相似文献
10.
Iodide fluorescence quenching of sol-gel immobilized BSA 总被引:1,自引:0,他引:1
Several potential applications of sol-gel immobilized proteins may require drying the gel before use. The attendant shrinkage may sterically restrict the penetration of solutes to the entrapped protein. In this study, collisional quenching of intrinsic bovine serum albumin (BSA) fluorescence by dissolved iodide was used to quantitatively compare the accessibility of protein molecules entrapped in hydrated and dried sol-gel monoliths. The results show that iodide penetration to immobilized BSA is sterically restricted by approximately 25% in hydrated gels and 50% in dried gels, relative to the quenching behavior of dissolved BSA. The further decrease upon drying is consistent with the overall degree of monolith shrinkage. 相似文献
11.
Enseleit U. Feller C. Partsch U. Vonau W. 《Journal of Solid State Electrochemistry》2021,25(8-9):2293-2300
Journal of Solid State Electrochemistry - The fabrication and characterisation of potentiometric chalcogenide glass electrodes with selectivity for iodide in aqueous media are reported. While such... 相似文献
12.
13.
An amperometric method for the determination of iodide ions has been developed using disposable, screen‐printed electrodes. The used sensors have a gold, graphite and platinum working electrodes with an area of about 7 mm2. Calibration curves exhibit a linear relationship between the electrode response and the iodide concentration up to 3.00 mM. The correlation coefficients for all calibration curves varied from 0.988 to 0.998. The relative standard deviations were equal to or less than 5.26 % (n=5). The lowest iodide concentration measured was 100 µM. 相似文献
14.
反相微乳液法合成碘化铅纳米棒 总被引:1,自引:0,他引:1
用Pb(NO3)2和KI为反应物, 在水溶液/Triton X-100/正己醇/环己烷反相微乳液体系中制得了碘化铅纳米棒. 研究了ω0(水与表面活性剂的摩尔比)、反应物浓度、反应温度及陈化时间等因素对产物尺寸和形貌的影响, 并用TEM和XRD等技术对产品进行了表征. 相似文献
15.
《Analytical letters》2012,45(11):2321-2331
ABSTRACT ABSTRACTA new kinetic spectrophotometric method for the simultaneous determination of concentrations of micro bromide and iodide has been proposed. It is based on their catalytic effects on the reaction of m-cresol purple oxidized by potassium periodate in hydrochloride acid medium. The reaction rate was monitored by measuring the decrease in absorbance at 528nm and the increase in absorbance at 455nm. The total difference in absorbance of the sum of bromide and iodide is identical with determination of bromide was carried out after Cr(VI) oxidized I? to I2, and I2 was removed by extraction with CCI4, and the amount of iodide was measured by subtracting the absorbance change of bromide from the total absorbance change in the presence of bromine and iodide. The optimum conditions influencing the reaction rate were studied. The linear range of determination is 0~4.0μg/ml for Br? and 0~3.0 μg/ml for I?. The detection limits are 0.032μg/ml for Br? and 0.059 μ/ml for I?. The method was successfully applied to the determination of micro amounts of bromide and iodide in food and life samples. 相似文献
16.
食品和环境样品中往往同时含有硝酸根和碘离子,用紫外分光光度法直接测定硝酸根或碘离子时,二者相互干扰。为此建立了主、次波长分别为220.0、231.5 nm的等吸收点双波长紫外分光光度法测定溶液中的硝酸根和共存的碘离子。当溶液中硝酸根的浓度在0~0.12 mmol/L的范围内,碘离子的浓度在0~0.10 mmol/L的范围内时,主、次波长下的吸光度差值A220-231.5与溶液中硝酸根的浓度 呈良好线性关系,线性方程为A220-231.5 = 2.9958 0.0016(R2 = 0.99994);其中A220 (NO3-) = 3.6099 0.0084(R2 = 0.99994),利用吸光度的加和性:A220 (I-) = A220 - A220 (NO3-) = 10.7394 0.0029(R2 = 0.99994),间接得到碘离子含量 。硝酸根和碘离子的平均相对标准偏差分别为0.6%、0.2%,回收率分别为99.5~102%、99.9~100%。方法简便快捷,可用于溶液中微量硝酸根和碘离子的同时测定。 相似文献
17.
室温固相化学反应合成表面修饰的碘化铅纳米棒 总被引:4,自引:0,他引:4
以硝酸铅和碘化钾为原料, 在体系中添加表面活性剂聚乙二醇(PEG), 采用一步室温固相化学反应制备出聚乙二醇表面修饰的碘化铅纳米棒, 利用X射线衍射, 红外光谱, 透射电子显微镜, 扫描电子显微镜, 热分析和元素分析等手段对其进行了表征. 实验结果表明: 在体系中添加的表面活性剂PEG不仅与碘化铅纳米棒发生了化学键合作用, 而且对产物形貌的控制起到决定作用, 形成了表面键合有聚乙二醇的碘化铅纳米棒, 其中被PEG600修饰的碘化铅纳米棒粗细均匀, 表面光滑, 直径约为100 nm, 长度达2 μm. 相似文献
18.
The mixture of silver iodide and ferrocene is used to prepare the membrane of iodide ion-selective electrode. The interference of sulfide can be reduced by the addition of cupric ion in the test solution. Ethylene glycol is determined by potentiometric titration using iodine ion-selective electrode as an indicator electrode. 相似文献
19.
《Analytical letters》2012,45(6):695-705
Abstract Flow injection analysis (FIA) with a double injection technique was applied to catalytic determination of thiocyanate and iodide in the redox reaction between cerium (IV) and arsenic (III). Selective inactivation of the catalytic activity of thiocyanate was investigated. Amounts of only iodide and amounts of both thiocyanate and iodide were simultaneously determined by the FIA. Detection limits of the method were 0.2 ppm SCN? and 0.1 ppm I?. 相似文献
20.
Treatment of ketals with phenyl dichlorophosphate and sodium iodide in refluxing benzene gave rise to ketones. 相似文献