MENU
A phenalenone-based receptor has been designed by Sarkar and co-workers for the sensing of iodide in THF with KSV value 32 × 104 M−1 [83]. Valiyaveettil and co-workers reported sensing of iodide using five carbazole-containing conjugated copolymers with KSV values in the range 1.43 × 104 to 16.0 × 104 M−1 in THF medium [84].
عرض المزيد
A simple and cost effective method for separation and preconcentration of Ag(1) at the 10 - 7 mol L - 1 level in the environmental and mineral samples is present. The method is based on the flotation of Ag(I)-iodide complex as an ion-associate with ferroin in pH of 4 from a large volume of an aqueous solution (500 mL) using n-heptane. The floated layer was …
عرض المزيد
Then, the total starch content of plant tissues was determined using the spectrophotometric iodide method in Elisa Microplate Reader (BioTek/Epoch, Vermont, USA) and the color change was detected ...
عرض المزيد
We developed a sensitive and selective method for quantifying nitrate, thiocyanate, perchlorate and iodide in human urine using ion chromatography coupled with electrospray ionization tandem mass spectrometry. Analysis of proficiency testing materials and spiked urine indicates that the method is precise (coefficients of variation …
عرض المزيد
The method is based on formation of an ion-associate between Ag(I)-iodide complex and ferroin, which can be floated at the interface of the aqueous/n-heptane phases. The flotation process was carried out using 500-ml aliquot of the aqueous solution and the floated layer was dissolved in 5 ml of 1 M HNO3 containing methanol (50% v/v) as the solvent.
عرض المزيد
The second method is based on ion-pair formation between iodide and Fe(phen) 3 2 −, followed by extraction of the ion associate with a mixture of 150 μL of …
عرض المزيد
Sensitized extraction spectrophotometric determination of Hg (II) with dithizone after its flotation as ion-associate using iodide and ferroin.
عرض المزيد
A further incorporating of iodide ion significantly enhanced this catalysis. This enhancement provided a turn-on signaling toward iodide down to nanomolar level. It was then coupled to an interaction between iodide and mercuric ion, and a response toward Hg 2+ down to nanomolar was obtained as well. The method was advantageous …
عرض المزيد
An Aliquat 336 iodide supported ionic liquid phase ... The average concentration of indium within the Earth's crust is only 0.05 mg kg −1 and since it only occurs in association with zinc (e.g. in sphalerite), copper (e.g. in chalcopyrite), ... it was necessary to saturate the ionic liquid using a 50 g L –1 KI solution prior to the ...
عرض المزيد
In JCE Classroom Activity #92, these two reactions are used to test for the presence of iodide ion in iodized salt. Of course table salt is comprised primarily of sodium chloride (NaCl), but iodized salt has a …
عرض المزيد
The fluorescence-based assay of iodide ion (I −) has been extensively studied by the use of different sensing probes and techniques, but it remains a tricky task to eliminate the interference of chloride ion (Cl −) for the analysis of low-level I − in complex genuine samples. Herein, we develop a redox pretreatment strategy for specific …
عرض المزيد
Water activity coefficient (left) and mean ionic activity coefficient (right) in aqueous solutions of cesium iodide at 298 K. Solid lines 1 and 2 are calculated using the extended Debye-Hückel theory (methods 1 and 2 respectively), lines 3 and 4 are calculated allowing for ion association with equilibrium constants K A = 1.33 and 0.4 L/mol ...
عرض المزيد
Sensitized extraction spectrophotometric determination of Hg(II) with dithizone after its flotation as ion-associate using iodide and ferroin (PDF) Sensitized extraction spectrophotometric determination of Hg(II) with dithizone after its flotation as ion-associate using iodide and ferroin | hamid moghaddam - Academia.edu
عرض المزيد
A combined method involving electrochemical oxidation of iodide to iodate at a platinum electrode followed by extraction in CCl4 of ionic associates of iodine-iodide complexes with brilliant green, formed in excess of iodide, was developed for the spectrophotometric quantification of iodide. The slope of the calibration curve yields a …
عرض المزيد
Analysis of iodide is less robust than the other analytes because of the potential for differential ion suppression between iodide and its internal standard (3CBS). To minimize matrix effects and increase assay accuracy for iodide, this method uses less sample material (100 μL) compared with previous methods (500 μL).
عرض المزيد
The established method has been successfully applied for the determination of iodide at the level of μg l –1 in saturated brine. 2 Experimental 2.1 Apparatus and reagents The ICS-2500 module ion chromatography system (Dionex, CA, USA) was used throughout the experiment. The system is composed of a GS50 gradient pump with on …
عرض المزيد
This can be explained by the more tendency of ion association reaction rather than binding through chelation reaction.In particular case where the later mechanism preferentially occurred, ... The iodide solution was prepared by mixing 1 µg Pd(II), 2 µg Pt(II), 0.2 mL of 1 M potassium iodide, 0.2 mL of 1 M nitric acid and water to make a 20 …
عرض المزيد
Preparation of the solutions. standard solution of potassium iodide was prepared by dissolving 0.166 g potassium iodide (Reachim, chemically pure) in double-distilled water and diluting to the mark in 100 mL volumetric flask. Solutions with less concentration are prepared with diluting of this solution.
عرض المزيد
Received June 27, 2017. Abstract—Optimal conditions for the microextraction concentration and spectrophotometric determina tion of iodine (I, V, VII) forms as ionic associates of …
عرض المزيد
The method is based on the flotation of Ag(I)-iodide complex as an ion-associate with ferroin in pH of 4 from a large volume of an aqueous solution (500 mL) …
عرض المزيد
The method is based on the flotation of Ag(I)-iodide complex as an ion-associate with ferroin in pH of 4 from a large volume of an aqueous solution (500 mL) using n - heptane.
عرض المزيد
where η r, η and η 0 are the relative viscosity of a solution, viscosity of the solution and viscosity of the pure solvent, respectively; C is the concentration and A, B and D are fitted coefficients. The C 1/2 term is associated with a reference ion and its ionic atmosphere which may be calculated by the Falkenhagen theory. 9 For organic …
عرض المزيد
A label-free fluorescent nanoprobe for iodide ion (I−) detection was developed based on the direct fluorescence quenching of spermine-functionalized carbon dots (SC-dots), whether in complex biological fluids or living cells. The positively charged SC-dots were fabricated via one-step microwave synthesis and exhibited excellent …
عرض المزيد
Abstract. This paper describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination of trace amounts of mercury. The method is based on the flotation of an ion-associate of HgI4 (2-) and ferroin between aqueous and n-heptane interface at pH 5. The ion-associate was then …
عرض المزيد
Method 2. This extraction is based on the ion-pair formation between I − and Fe (phen) 3 2 + which can be easily extracted into nitrobenzene phase [17].. 500 μL of a sample solution containing iodide was placed in a conventional 10-mL glass syringe.Using phosphate buffer, mixture was diluted to 5 mL and 1 mL of 4 × 10 −3 M tris(1,10 …
عرض المزيد
Iodides. Phenanthrolines. Water. ferroin. Mercury. This paper describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination …
عرض المزيد
This paper describes a simple and highly selective method for the separation, preconcentration and spectrophotometric determination of extremely low concentration of mercury. The method is based on the flotation of an ion-associate of HgI 4 2− and ferroin between aqueous and n-heptane interface at pH 5.The ion-associate was …
عرض المزيد
philic iodide anions were used, however, ion association was observed with small dimethyl imidazolium cations but not with imidazolium cations that contained long octyl chains.8 Also the influence of the alkyl chain length of imidazolium-based cations on cation diffusion in water has been studied in a few cases.
عرض المزيد
3. Results and Discussion A methodfor the determination of iodide in the form of an ionic associate with brilliant green has been described [8].
عرض المزيد
(2). On the other hand, the S,O:-ions were found able to reduce the produced ion-associate (CH,),N+ 1, to the iodide ion. The determination of 10 pg of periodate or iodate by the proposed procedure in artificial fresh water containing 10 mg 1~ of sodium, calcium, chloride, sulphate and bicarbonate to- gether was carried out against a blank.
عرض المزيد
A combined method involving electrochemical oxidation of iodide to iodate at a platinum electrode followed by extraction in CCl4 of ionic associates of iodine-iodide …
عرض المزيد
Tetrabutylammonium iodide contains a sufficiently hydrophobic cation to ensure a high distribution constant of the ion associate as well as the iodide ion necessary to form the extractable triiodide anionic complex. Moreover, using the colorless countercation TBA allows the shortcomings of using colored counterions – the main …
عرض المزيد
Sensitized extraction spectrophotometric determination of Hg(II) with dithizone after its flotation as ion-associate using iodide and ferroin. Hosseini MS, Hashemi …
عرض المزيد
ion-associate, which is subsequently attributed to the instability for ferroin and mercury iodide (HgI 4 2–) complexes at low and high pH values, respectively. The effect of iodide …
عرض المزيد
The methods are based on the formation of ion-association complex of Hg(II) with Rhodamine B, [(HgI4)2-][(Rhodamine B)+]2 in highly acidic solution. Extraction using benzene showed the Beer's law was obeyed for mercury(II) in the range of 5 to 27 μg Hg(II) / 20 mL of sample and molar absorptivity, ε = 17.68 × 104 L mole-1cm-1.
عرض المزيد
imply the use of the liquid ion chro matography method [33], inverse voltammetry and kinetic method [33] or extractionphotometric method [34]. The latter implies the oxidation of iodide ions to free iodine by using the nitrous acid with subsequent iodine extraction by chloroform. A disadvantage of this method is its low sensi
عرض المزيد
Copyright © 2024 Sofol Industry & Technology Group Co., Ltd.
المنتجات
محلول
حول الولايات المتحدة
اتصل بنا