Separation of Be and Al for AMS using single-step column chromatography
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Abstract:
With the aim of simplifying AMS target preparation procedures for TCN measurements we tested a new extraction chromatography approach which couples an anion exchange resin (WBEC) to a chelating resin (Beryllium resin) to separate Be and Al from dissolved quartz samples. Results show that WBEC–Beryllium resin stacks can be used to provide high purity Be and Al separations using a combination of hydrochloric/oxalic and nitric acid elutions. 10Be and 26Al concentrations from quartz samples prepared using more standard procedures are compared with results from replicate samples prepared using the coupled WBEC–Beryllium resin approach and show good agreement. The new column procedure is performed in a single step, reducing sample preparation times relative to more traditional methods of TCN target production.Keywords:
Oxalic Acid
Nitric acid
Chelating resin
Ion-exchange resin
Ion chromatography
Sample Preparation
Hydrochloric acid
Experiments were performed for the removal of Cr, Fe+2, Cu+2, and Ni+2 with Dowex XFS 4195.02 ion exchange resin at 25°C. A mathematical model for the removal of both Cr and Cu+2 from aqueous solutions in the presence of the resin was developed with the assumption that intraparticle diffusion is a controlling step for the adsorption of the heavy metal ions on the resin. The intraparticle diffusivities of Cr and Cu+2 through the resin were obtained to be 0.5 and 0.03 - 0.05 cm2/min, respectively. A series of experiments on the regeneration of Cu+2 saturated resin were conducted at 25°C, using 0.5 - 2 N NH4OH aqueous solution. A mathematical model on the regeneration of the exhausted resin was developed.
Ion-exchange resin
Chelating resin
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A selective chelating resin was prepared by loading pyrogallolsulphonic acid (PGS) on a conventional anion-exchange resin, Seralite SRA-400. The loaded resin was stable in 0.1 M HCl. Its equilibrium sorption capacity as a function of pH and the exchange kinetics for various metal ions were studied. The loaded resin showed high selectivity towards MoVI, VV and FeIII. The sorption capacities of the PGS-loaded resin for FeIII, VV and MoVI were 0.69, 0.75 and 0.4 mmol g–1, respectively. The loaded resin was used for the separation and enrichment of these metals.
Chelating resin
Ion-exchange resin
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Chelating resin
Ion-exchange resin
Neutron Activation Analysis
Trace Amounts
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The separation of Cu2+ and Ni2+ in an acidic aqueous solution with chelating ion-exchange resin, Dowex A-1, has been studied in the batch. and column processes. In the batch process, the adsorption test was carried out over the range of concentration from 0.001 to 0.1 M. Adsorption of Cu2+ and Ni2+ on the resin was influenced by various factors such as specieses of cation, pH value and concentration in the test solution. Although both Cu2+ and Ni2+ ions were adsorbed on the resin from the mixed solution, the adsorption ratio of Cu2+ to Ni2+ on the resin was increased with increasing the Cu2+ concentration in the solution. When thequantity of Cu2+ ion exceeds the exchange capacity of the resin, Cu2+ion was selectively adsorbed on the resin, and almost all of the Ni2+ ion remained in the solution. The data obtained from these experiments revealed that the batch process was more useful method than the column process for the selective separation of Cu2+ from the mixed solution containing Cu2+ and Ni2+ ions.
Ion-exchange resin
Chelating resin
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Mixtures of amines can be separated by elution chromatography on a chelating resin, Dowex A-1 loaded with nickel ions based on ligand exchange. Aqueous ammonia is used as the eluent. The method has proved particulary effective for separating aromatic amines.
Iminodiacetic acid
Chelating resin
Ion-exchange resin
Ion chromatography
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Chelating resin with macrocyclic mercaptal group supported on macroporous polystyrene beads was synthesized, which showed good selectivity to Hg~(2+): its complexing capacity amounted to 30—60 mg Hg~(2+)/g resin, two orders of magnitude greater than for other metal ions such as Ca~(2+), Zn~(2+), Cd~(2+), Pb~(2+) etc. This resin could restore the activity of urease which had been deactivated by poisoning with Hg~(2+). Its restoring power was far better than that of the mercapto-resin and common anionic exchange resins. It showed some promising use as an oral polymeric detoxifying drug for mercury poisoning.
Chelating resin
Ion-exchange resin
Mercury
Acrylic resin
Polystyrene
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An Al(III)-loaded and Al(OH)3-coated chelating resin Lewatit TP 260 was utilized for the removal of F− from aqueous solutions. Both forms of resin showed superior properties in the removal of F−. Removal performances of such resins were investigated extensively by adsorption isotherms and kinetic tests. It was revealed that maximum adsorption capacity of Al(OH)3-coated resin (0.55 mg/g) was higher than Al(III)-loaded resin (0.40 mg/g). The adsorption kinetics of both resins fitted well with the pseudo-second-order equation. The initial adsorption rate of Al(OH)3-coated resin was approximately seven times greater than Al(III)-loaded resin. The equilibrium isotherms have been investigated by using Langmuir and Freundlich isotherm equations and the obtained experimental data were best described by Langmuir model. The removal of F− by both forms of resin was accomplished by an anion-exchange mechanism. In the presence of Cl− and , removal performances of resins did not vary however, when the Al(III)-loaded resin was used, the presence of species reduced the removal efficiency of such resin.
Ion-exchange resin
Chelating resin
Langmuir adsorption model
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Ion-exchange resin has capacity of exchange,selection,adsorption and catalysis in the industrial wastewater treatment.It was mainly used for the recovery of heavy metals or rare metals,purification of toxic substances and the removal of acidic or alkaline organic material.The research progresses of ion-exchange resin(anion exchange resin,cation exchange resin,amphoteric ion exchange resin,chelate resin and redox resin) in industrial wastewater treatment were reviewed.It was also pointed out that because of its advantages of deep purification,high efficiency and comprehensive recovery of the various metals,the method of ion-exchange resin was one of the most widely used technology for industrial treatment in China,which would get more in-depth application in the field of water treatment.
Ion-exchange resin
Chelating resin
Industrial wastewater treatment
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陰イオン交換樹脂およびキレート樹脂を用い,種々の配位子が存在する廃液中の水銀の除去条件を検討した。キレート化剤(EDTA,ペプトン)の存在は樹脂による水銀の除去を妨害したが,Br-あるいはI-の存在は陰イオン交換樹脂による水銀の除去効果を増大させた。陰イオン交換樹脂2gを充墳したカラムを用いて水銀(II)(1mg/l)溶液を処理した結果,KI(0.17%,pH2.5)のみを添加した系においては,90lを処理した後でも水銀濃度0.5μg/l以下の処理水が得られた。EDTA(1mmol/l,pH6)あるいはペプトン(5g/l,pH2.5)が存在すると水銀の除去はほとんどなされなかったが,これにKIを0.017あるいは0.17%添加することによりKIのみを添加した場合と同程度の結果が得られた。水銀吸着用キレート樹脂を用いた場合も同様に,KIの添加によって水銀の除去効果は大きく向上したが,処理液量は陰イオン交換樹脂より少なかった。これらの結果から,キレート化剤を含有する水銀廃液の処理にさいしては共吸着剤としてKIを添加することが効果的であり,吸着剤としては陰イオン交換樹脂が優れていると結論した.
Ion-exchange resin
Mercury
Chelating resin
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ボスホン酸ジフェニルーホルムアルデヒド縮合樹脂にイミノ二酢酸を導入したキレート樹脂の合成を試み,その金属イオン吸着性および六価クロム吸着性について検討した。イミノ二酢酸の導入反応は80℃,2時間加熱することにより容易に行なわれ,イオン交換容量は1.9meq/g-R(乾燥樹脂)で,吸着速度および通液性にすぐれた樹脂が得られた。Cu2+イオンに対して低pH域で選択吸着性を示し,ほかの二価金属イオンからの分離が可能であった。また,同属金属イオンであるCo2+とNi2+イオンとの相互分離が1.0mol・dm-3酢酸でできることが見いだされた。本樹脂は耐酸化性に富み,硫酸溶液中のCr2O72-イオンの良好な吸着性を示した。硫酸濃度を低くすると高濃度のCr2O72-イオンの吸着処理が可能であり,また,吸着したイオンは0.3v/v%H2O2-0.1mol・dm-3NaOH溶液で100%回収できた。
Iminodiacetic acid
Ion-exchange resin
Chelating resin
Phosphonate
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