scholarly journals Report on Isotherm Studies for Cation Exchange Resins for Cr(III) Removal and Expanded Anion Exchange Column Studies for Cr(VI) Removal

1999 ◽  
Author(s):  
J.M. Norton ◽  
D.F. Lawler ◽  
H.M. Liljestrand
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Column Studies ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Cation Exchange Resins ◽  
Exchange Resins

Design and Research of Spent Resin Conical Dryer Device

2017 ◽  
Author(s):  
Yan Zhou ◽  
Haifeng Zhang
Keyword(s):  
Thermal Decomposition ◽  
Cation Exchange ◽  
Water Content ◽  
Anion Exchange ◽  
Vacuum Drying ◽  
Drying Process ◽  
Anion Exchange Resins ◽  
Cation Exchange Resins ◽  
Exchange Resins ◽  
Spent Resin

This paper introduced the design and research of spent resin conical dryer which was based on the analysis of the thermal decomposition characteristics of resins. The drying experiment of non-radioactive cation exchange resins and anion exchange resins was also carried out in this study. The result showed that the water content of resins reduced from about 55%(wt) to 8.5%(wt) and the volume reduction ration reached 2.17 with a drying end temperature of 90°C, which preliminarily verified the feasibility of the vacuum drying process and conical dryer device for treating radioactive spent resins.

Excretion of L-Dopa and Its Metabolites in Urine of Parkinson's Disease Patients Receiving L-Dopa Therapy

1971 ◽  
Vol 17 (9) ◽  
pp. 867-871 ◽  
Author(s):  
J I Routh ◽  
R E Bannow ◽  
R W Fincham ◽  
J L Stoll
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Paper Electrophoresis ◽  
Colorimetric Determination ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Cation Exchange Column

Abstract L-Dopa and its major metabolites were separated from daily 24-h urines from patients with Parkinson’s disease, who were being treated with increasing doses of the drug, up to 4 g per day. An aliquot of each sample was passed through three different ion-exchange columns. Catecholamines (dopamine, epinephrine, norepinephrine, metanephrine, and normetanephrine) were retained on a cation-exchange column, eluted with boric acid, and quantitated by fluorometric analysis. Catechol acids, present in the effluent of the cation-exchange column, were retained on an anion-exchange column. An aliquot of the eluate of the anion-exchange column was used for colorimetric determination of 3,4-dihydroxyphenylacetic acid, while the effluent from this column was used for colorimetric determination of dopa. A second aliquot of the eluate from this column was passed over a column of alumina, which retained all the acidic metabolites except homovanillic acid, which was measured fluorometrically in the effluent from the alumina column. Vanilmandelic acid was determined in another aliquot of each urine sample by use of paper electrophoresis. The excretion pattern elicited suggests a major metabolic pathway for the L-dopa administered to patients with Parkinson's disease.

scholarly journals Determination of plutonium, uranium and americium/curium isotopes in environmental samples with anion exchange, UTEVA, Sr and DGA resin

2011 ◽  
Vol 1 (1) ◽  
pp. 189-194 ◽  
Author(s):  
M.H. Lee ◽  
J.-H. Park ◽  
K. Song
Keyword(s):  
Anion Exchange ◽  
Environmental Samples ◽  
Scintillation Counter ◽  
Uranium Isotopes ◽  
Dga Resin ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Uteva Resin ◽  
Pu Isotopes ◽  
Exchange Resins

AbstractThis study presents a quantitative sequential radiochemical separation method for the Pu, U, Sr and Am/Cm isotopes with an anion exchange resin, UTEVA resin, Sr resin and DGA resin in environmental samples. After the radionuclides were leached from samples with 8 M HNO3, the Pu, U, Sr and Am/Cm isotopes were sequentially adsorbed on the anion exchange column, UTEVA column connected with Sr Spec column and DGA column. The Pu isotopes were purified from other nuclides through the anion exchange column, and the uranium isotopes were separated from other nuclides through the UTEVA column. Also, 90Sr was separated from other hindrance elements such as Ca2+, Ba2+ and Y3+ with the Sr Spec column. Finally, Am/Cm fractions were purified with the DGA and anion exchange resins. After α source preparation for the purified Pu, U and Am/Cm isotopes with the micro-coprecipitation method, the Pu, U and Am/Cm isotopes were measured by an alpha spectrometry. Strontium-90 was measured by a low level liquid scintillation counter. The radiochemical procedure for Pu, U and Am nuclides investigated in this study has been validated by application to IAEA Reference soils.

scholarly journals Ion Chromatographic Method for the Simultaneous Determination of Anions and Cations in Firecrackers and Matches Samples as Known Potential Explosives

2019 ◽  
Vol 15 (1) ◽  
pp. 138
Author(s):  
Muhammad Amin ◽  
Lee Wah Lim
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Mobile Phase ◽  
Limit Of Detection ◽  
Reference Method ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Relative Standard ◽  
Cation Exchange Column

<p class="Abstract">A reference ion chromatography method based on column switching has been presented for the simultaneous determining anions (Cl<sup>−</sup>, ClO<sub>3</sub><sup>−</sup>, NO<sub>2</sub><sup>−</sup>, SO<sub>4</sub><sup>2</sup><sup>−</sup>, and NO<sub>3</sub><sup>−</sup>) and/or cations (NH<sub>4</sub><sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup>) using one pump, one type of mobile phase, and one detector. The reference method performed anion-exchange column and cation-exchange column and arranged serially via one 10-port valve. The determination of either anions or cations in one determination system could be made by switching the valve. When the use of 1.25 mM trimellitic acid as a mobile phase and the instrument was operated at a flow rate of 0.6 mL/min, five anions and five cations were determined on the anion-exchange column and the cation-exchange column, respectively. All anions target could be determined completely within 55 minutes, whereas the cations target could be determined within 35 minutes. The calculation of limit of detection using S/N=3 was 3.85 − 14.10 µM for anions and 2.95 − 10.58 µM for cations. The relative standard deviations of all ions were less than 3.82%, 3.29%, and 3.21% for retention time, peak area, and peak height, respectively. The reference method was then applied for the simultaneous determining anions and/or cations contained in firecrackers and matches samples as known potentially explosives.</p>

Study on the Alkoxylation of Dihydromyrcene over Cation Exchange Resins

2019 ◽  
Vol 58 (27) ◽  
pp. 11871-11877 ◽  
Author(s):  
Si Chen ◽  
Su Wang ◽  
Zheng Zhou ◽  
Gaodong Yang ◽  
Zhibing Zhang
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Resins ◽  
Exchange Resins
Sign in / Sign up

Export Citation Format

Share Document