Iodide transport in thyroid cells. As illustrated in Figure 1, the NIS (SLC5A5), a member of the solute carrier family 5, located at the basolateral plasma membrane of the thyroid follicular cells actively transports iodide into the thyroid using the electrochemical gradient generated by the Na,K-ATPase [9–11].This process also …
Flow injection spectrophotometric method [16] was described using an ion associate of iodate with 3,5-Br 2-PADAP and thiocyanate, with the detection limit of 63 ng ml −1 and a sampling frequency of 80 h −1. Choengchan et al. [17] developed a flow injection spectrophotometric based on blue I 3 − –starch complex.
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).
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 …
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.
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 …
Spectrophotometric determination of trace amounts of iodide-ions in form of ionic associate with brilliant green using electrochemical oxidation March 2011 Open …
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 ...
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 then dissolved in dimethylsulfoxide (DMSO) for the subsequent spectrophotometric determination.
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.
In this work, we use quantum chemical methods to calculate the binding energies, enthalpies and free energies for clusters of an iodide ion with a number of …
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 …
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 …
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 …
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 …
An iodide ion is the ion I −. [2] Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate. Worldwide, iodine deficiency affects two billion people and is the leading preventable cause of intellectual disability.
Extraction constant of ionic associate of iodine-iodide complexes with brilliant green in CCl4 has been estimated (Kextr115±5). Discover the world's research 25+ million members
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 ...
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
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 nheptane.
The detection limit for the iodide ion is 0.12 nM based on the standard deviation of the blank, while sample reproducibility is typically <2% at >8 nM and ∼4% at <8 nM. Since there is no environmental certified reference material for iodine species, the measurements made on seawater samples using this IC method were compared to …
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 …
(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.
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 …
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 then dissolved in dimethylsulfoxide (DMSO) for the subsequent spectrophotometric determination.
Quantitative flotation of the ion-associate was achieved when the volume of the water sample containing Hg(II) was varied over 50–800 ml. Beer's law was obeyed …
The mechanism of Zr(IV) to enhance the oxidation of I − was analyzed. Electron spin resonance (ESR) analysis showed that the coexistence of Zr(IV) with H 2 O 2 caused the generation of ⋅OH, indicating that Zr(IV) exhibited peroxidase-like activity to trigger the homolytic splitting of H 2 O 2 into ⋅OH (Figure 1 A).After the addition of I −, …
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 …
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 ...
Gel polymer electrolytes using imidazolium based ionic liquids have attracted much attention in dye-sensitized solar cell applications. Hydroxypropyl cellulose (HPC), sodium iodide (NaI), 1-methyl ...
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 …
