ارتباط با ما
با ما تماس بگیرید
0086-21-58386256
0086-21-58386256
Cow's milk has a naturally low iodine concentration but is a rich source of iodine through standard farming practices such as the addition of iodine salts to cattle feed and use of iodine-based ... plant-derived proteins are associated with lower GHGE (<4 kg of carbon dioxide per kg of edible weight) than most animal-derived protein ...Web
In situ SAXS/WAXS indicates remarkable amounts of solid iodine deposited in the carbon nanopores. Combined with stochastic modeling, in situ SAXS allows …Web
The speciation of iodine in environment must be known in order to properly assess its geological fate and to study potential remediation materials for the decontamination of water containing radioactive iodine. In this study, the utilization of silver-impregnated granular activated carbon for separation between two iodine species, …Web
The results show that the FCDI cells can effectively treat different concentrations of iodine-containing brackish water and the RE (50 to 500 mg/L) is up to 91%, while the ASAR and SAC are almost positively correlated with the increase of feed iodine concentration (Fig. 6 b, c). When the initial concentration is 50–500 mg/L, the …Web
3.1.1 Effect of KOH solution concentration on activated carbon. Under the conditions of solid-liquid ratio of 1: 4, activation temperature of 750 ℃ and activation time of 2h, the concentration of KOH ... and reached the highest yield of 24.48% at the concentration of 40%, the maximum iodine adsorption value and the highest methylene blue ...Web
Preliminary studies have shown that the concentration of iodine in brine is much higher than that in seawater, ... (nZVI), carbon nanotubes (CNTs), and covalent organic frameworks (COF) [11]. For Iodine adsorption, Pei et al. used two porous organic frameworks, PAF-1 and JUC-Z2, to adsorb iodine at 298 K and 40 Pa [12].Web
Iodine in natural salt waters such as iodine-rich underground brine generally exists as iodide ions, and to extract iodide ions, it is necessary to oxidize them to nonpolar iodine molecules. In this study, we report that iodide ions in natural brine containing high concentrations of chloride ions can be quantitatively extracted without oxidation by …Web
In this work, we report on a rapid, efficient electrochemical iodine sensor based on mechanically treated carbon nanofiber (MCNF) electrodes. The electrode's highly graphitic content, unique microstructure, and the presence of nitrogen heteroatoms in its atomic lattice contribute to increased heterogeneous electron transfer and improved …Web
two, total iodine concentration was determined in this laboratory using the standard ICP-MS method for iodine determination in food by EN 15111:20077. For all samples, ... The addition of carbon is a well-known way to increase the observable detection sensitivity especially for elements with an elevated 1st ionization potential. Therefore ...Web
Iodine (I), chemical element, a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. atomic number53 atomic weight126.9044 melting point113.5 °C (236 °F) boiling point184 …Web
In the dynamic mixed-gas adsorption with 150 ppm of I2 and 50 ppm of CH3I, COF-TAPT presents an excellent total iodine capture capacity (1.51 g·g−1), …Web
It can be seen that solubility of iodine increases with growth of temperature and pressure. Mole fraction of iodine on saturated solution at 20°C and 60–350 atm reached (0.12–1.42) × 10 –3; this corresponds to mass concentration of 0.035–0.062% and 2.2–3.9 times greater than solubility of iodine in water at the given temperature [].In this …Web
Together, iodine and bromine chemistry contribute a maximum of 92% of the ozone loss on 26 March 2020. When averaged over spring, iodine and bromine contribute about 56% of the ozone loss (bromine ...Web
Further, the greater the amount of activated carbon added, the faster the concentration of the gold iodide complex decreases. When the amount of activated carbon was 4 g, the recovery rate of gold on the activated carbon was 85.6% after 4 h. ... Moreover, as the iodide concentration increases, the electrode potential of the reaction …Web
3.1 Iodine in the Geosphere (Rocks, Minerals, and Soils). Iodine content in rocks varies with different rock types; however, the concentration is generally higher in sedimentary rocks (especially sedimentary deposits of marine origin) than in metamorphic and igneous rocks due to volatilization of iodine during the formation of igneous and …Web
Unexpectedly, iodide (I-), which was likely the form of iodine in the source materials and the expected dominant groundwater species based on thermodynamic considerations, only accounted for 1% to 2% of the total iodine concentration (Santschi et al. 2012). Organo-iodine comprised approximately 26% of the iodine speciation in groundwater, which hasWeb
Calculation where: 11.1 The capacity of a carbon for any adsorbate is depen- N2 = iodine, N, dent upon the concentration of the adsorbate in solution. The S = sodium thiosulfate, mL, concentrations of the standard iodine solution and filtrates must N1 = sodium thiosulfate, N, and be specified or known.Web
An activated carbon was prepared for capture of high concentration gaseous iodine. The sorbent reached a record high iodine uptake of 1634 mg/g in …Web
The iodine number is defined as the milligrams of iodine adsorbed by 1.0 g of carbon when the iodine concentration of the filtrate is 0.02 N . The iodine number is determined …Web
The adsorption of iodine by material sp 2 c-TFPA-Pxd can also be directly confirmed by the comparison of the photographs before and after the adsorption system (Fig. S10). 2 mg sp 2 c-TFPA-pXD was immersed in cyclohexane solutions with iodine concentration of 88 mg/L and 176 mg/L, respectively. With the increase of immersion …Web
Aqueous PEG solutions are capable of extracting iodine from chloroform and carbon tetrachloride solutions . The iodine vapor pressure over a PEG–iodine system is substantially lower than over pure iodine. ... The composite membranes showed a high efficiency against E. coli and S. aureus at an iodine concentration of 0.31 wt %, the ...Web
A low iodine concentration shows up in dull tissue, reduced growth, colourless growth tips or growth edges and clear light sensitivity. Corals become more sensitive to parasites, dinoflagellate infestation by ejected zooxanthellae occurs more frequently. ... they can be removed from the water by activated carbon and other adsorbers. As in the ...Web
Most iodine found in the atmosphere comes from the ocean—where it exists as iodide, also present in table salt. Its three-fold increase in the atmosphere over the past 70 years is linked to an …Web
The extracted iodine concentration for the three binding states (exchangeable, bound to carbonate, bound to Fe 2 O 3) in the borehole sediments is shown in Tables 4 and 5. The total iodine concentration extracted from the borehole sediments ranges from 0.053 to 1.7 μg/g for BT, 0.089 to 0.88 μg/g for CZ, and 0.17 to 3 μg/g for HH.Web
The isotherms of the adsorption of iodine onto the pSi–C composite are obtained at a temperature of 298, 308, and 318 K. In the same way, 20 mg of the adsorbent is added into 4 mL of iodine solution, and the concentration of the iodine solution and the concentration of the iodine solution is changed from 500 to 2100 mg L −1.Web
In this work, we report on a rapid, efficient electrochemical iodine sensor based on mechanically treated carbon nanofiber (MCNF) electrodes. The electrode's highly graphitic content, unique …Web
The iodine adsorption on activated carbon is mainly chemisorption, which is spontaneous and endothermic. • Pseudo-second order kinetics and the Langmuir model …Web
Organic iodine may include organic molecules in which iodine is covalently bonded to carbon, for example, the very low concentrations of low molecular weight volatile organoiodine compounds (e.g., methyl iodide) or there are higher molecular weight complexes such as iodinated metabolites or complexes in which the denticity and type of …Web
A population's iodine status is defined as 'inadequate' if the median UI concentration is <100 μg/l according to the World Health Organization and the median urinary iodine concentrations <20 μg/l indicate severe iodine deficiency in a population 26. For our lowest standard (13 μg/l) the CV exceeds the set of limit of ≤15%.Web
