In-vitro 137Cs sorption by natural and monoionic forms of clinoptilolite (original) (raw)
Related papers
The effect of clinoptilolite on 137 Cs binding in broiler chickens
The objective of this study was to evaluate the 137 Cs binding capacity of clinoptilolite. In the first in vitro experiment we investigated sorption of 137 Cs to natural and modified forms of clinoptilolite in highly acid solution, prepared to be similar to that of the gut of pigs (pH = 2-3) at 37ºC. In the second in vivo experiment 137 Cs binding to a modified form of clinoptilolite was studied in orally contaminated broiler chickens. 137 Cs sorption in the high acidity solution depended on clinoptilolite concentration and varied between 30-85% of the initial activity. In the chickens, three hours after 137 Cs administration, there was 67% and 63% lower accumulation of 137 Cs in meat and edible organs (respectively) and seven hours after 137 Cs administration, there was 69% and 49% lower accumulation of 137 Cs in meat and edible organs (respectively) compared to the controls with no clinoptilolite added in food. Natural and modified forms of clinoptilolite have been shown to high sorption efficiency towards 137 Cs ions and could be recommended as possible radiocaesium binders in domestic animals.
Separation and Purification Technology, 2002
Distribution coefficients of cesium on natural and cation-enriched (Na + , K + , NH 4 + and Ca + 2 ) forms of clinoptilolite were measured by batch, radioactive tracer technique. The measurements were carried out for an initial cesium concentration range of 10 − 6 -10 − 1 mol/dm 3 and at temperatures of 25, 40, 60 and 80°C. Experimental isotherms evaluated from distribution coefficients were fit to Langmuir, Freundlich and Dubinin-Radushkevich (D-R)models. Of the models tested, D-R model was found to represent the isotherms better in a wider range of concentrations than either Langmuir or Freundlich model. Breakthrough behavior of cesium on natural and cation-enriched forms of clinoptilolite for a particular set of conditions were also determined in a small size column. Column parameters were evaluated using mass transfer zone concept.
Acta veterinaria, 2004
Various radioprotective agents are used with the aim of protecting animal and food of animal origin from radioactive contamination. The most efficient radiocaesium binder in animals is ammonium ferric hexacyanoferrate (AFCF). Based on the results obtained so far it can be concluded that the protection efficiency of AFCF in broiler meat and liver was 88%, after a single 137 Cs contamination, followed by immediate AFCF administration via gastric tube, while when mixed in the feed pellets this rate increased to 95%. In broiler chickens given clinoptilolite via gastric tube, the protection efficiency for meat and liver was 50%, while clinoptilolite mixed in the feed pellets showed the lowest protection efficiency in meat and liver of only 28%.
The ion exchange sorption of Cs + and Sr 2+ on clinoptilolite (CL) from deposit of Armenia in initial, modified by e-and γ-irradiation, decationated with a hydrochloric acid, and cation-contained forms was studied. On the basis of received data the exchange capacity Е for Sr 2+ and Cs + , distribution factor К d , sorption factor К s were determined. It was shown that untreated CL(Ar), decationated CL(Ar)H and Cacontaining forms are characterized by a big ion exchange activity on strontium and cesium to compare with irradiated samples and the most perspective ion exchange sorbents for these ions are CL samples modified by a chemical way. Ion Exchange Properties of Irradiated and Chemically Modified _____________________________________________________________________________________________ ХФТП 2010. Т. 1. № 3 285
Nutrition and Dietary Supplements, 2009
Effective treatment of chronic illness resulting from the long-term buildup of heavy metals in the body, such as chelation therapy, presents numerous clinical challenges, including undesirable side effects and unpredictable efficacy. Use of a naturally occurring zeolite, clinoptilolite, to remove these toxic substances may offer an efficacious and safe alternative to the traditional approaches. This study was designed to evaluate the ability of activated clinoptilolite suspended in water (ACS) to remove heavy metals from the body through urinary excretion without the undesirable removal of physiologically important electrolytes. The protocol utilized two treatment groups, each consisting of eleven healthy men aged 36 to 70 years. Volunteers were given a commercially available version of the study substance for seven days (Group 1) and 30 days (Group 2) and urine samples were collected at specified time points in the study. Changes in urinary concentration of the heavy metals were measured by inductively coupled plasma mass spectrometry and compared to the baseline. Also, serum samples were obtained from five individuals in each group and serum electrolytes were measured prior to and after taking the product. Participants in both groups had increased concentrations of heavy metals in the urine with the peak excretion at around day 4. No clinically significant alterations in serum electrolyte levels were seen at either seven or 30 days on ACS. In conclusion, this study demonstrates that the daily use of an activated clinoptilolite suspension represents a potentially safe and effective way to remove toxic heavy metals from the body through increased urinary excretion without removing clinically detrimental amounts of vital electrolytes.
Adsorption of bovine serum albumin (BSA) on clinoptilolite
Biochemical …, 2008
The purpose of the present work was to investigate the adsorption of BSA onto the clinoptilolite in aqueous media. In this study, batch adsorption experiments were carried out and the effects of pH, protein concentration, ionic strength and Si/Al ratio of zeolite on the ...
Spectroscopic study of heavy metals sorption on clinoptilolite
Physics and Chemistry of Minerals, 2005
Sorption of heavy metal cations (Pb(II), Cr(III), Cd(II), Ni(II)) from aqueous solutions on natural Na-clinoptilolite was studied using atomic absorption spectrometry (AAS) and FT-IR spectroscopy. It was found that the sorption capacity of clinoptilolite decreases in the following order: Pb(II) (22,600 mg/kg), Cr(III) (21,200 mg/kg), Cd(II) (10,400 mg/kg) and Ni(II) (6,200 mg/kg). In the FT-IR spectra of the samples, in the region of pseudolattice vibrations (500-800 cm À1 ), systematic changes connected with the type of cation and its concentration in the initial solution were observed. The proportions of ion exchange and chemisorption in the whole process of sorption were also estimated. It was found that the amount of cations sorbed on clinoptilolite depended on the concentrations and pH of the solutions used as well as on the contact time of zeolite-solution system. After 120 min of the reaction, despite the metal type, 90-100% of the total amount of cations were immobilized.
Scientific Reports, 2021
Lead exposure can cause substantial organ damage. Enteral lead absorption may be reduced by concomitant intake of clinoptilolite tuff, a zeolite from natural sources. This study aimed to assess the effect of purified clinoptilolite tuff (G-PUR) on enteral lead uptake in adults using stable lead isotope 204Pb as a tracer. In this randomized, placebo-controlled, double-blind, parallel-group study, 42 healthy participants were randomized to receive oral G-PUR 2.0 g, 2 * 2.0 g, or placebo, together with 2.5 µg of 204Pb in water. The enrichment of 204Pb caused by the tracer in blood and urine was measured by mass spectrometry. G-PUR was well tolerated. The mean maximum 204Pb enrichment of 0.505% of total blood lead was significantly higher (p < 0.0001) in the placebo group compared to G-PUR 2.0 g (0.073%) or G-PUR 2 * 2.0 g (0.057%) group. Normalized 204Pb AUC0-192 was 86.5, 11.9, and 8.5% * h without and with G-PUR 2.0 g, and G-PUR 2 * 2.0 g, respectively (p < 0.0001 vs. placebo)....
The removal of caesium ions using supported clinoptilolite
Journal of hazardous materials, 2015
In this paper, the sorptive kinetic and diffusional characteristics of caesium ion removal from aqueous solution by carbon-supported clinoptilolite composites are presented. Natural clinoptilolite was supported on carbonaceous scaffolds prepared from date stones. Thermal treatment was applied to produce voids in the carbon which was conditioned using polydiallyldimethylammonium chloride to facilitate the clinoptilolite attachment. This method allowed the formation of a consistent zeolite layer on the carbon surface. The composite was applied in the removal of non-radioactive caesium ions showing an enhanced uptake from 55mgg(-1) to 120.9mgg(-1) when compared to clinoptilolite. Kinetic studies using Pseudo First Order model revealed an enhanced rate constant for carbon-clinoptilolite (0.0252min(-1)) in comparison with clinoptilolite (0.0189min(-1)). The Pseudo-First Order model described the process for carbon-clinoptilolite, meanwhile Pseudo Second Order model adjusted better for pu...