The Ion-exchange Equilibrium between Cesium and Phenol-sulfonic-acid-type Cation Exchange Resin

Abstract A convenient screening procedure for presence of drugs of abuse in urine consists of two steps: adsorption of the drugs from urine onto a paper loaded with cation-exchange resin and detection of the adsorbed drugs by direct radioimmunoassay. The first step can be performed in the field, the second in a central laboratory. Storage and transport to the laboratory are simplified because specimens adsorbed on dried paper are stable and can be sent in letter-mail. In the laboratory, a small disc of the ion-exchange paper is exposed to antigen and antibody, rinsed, and tested for radioactivity. Discs treated with positive urines are more radioactive than discs from negative urines.

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DISTRIBUTION COEFFICIENTS AND ION EXCHANGE BEHAVIOUR OF SOME CHLORIDE COMPLEX FORMING ELEMENTS WITH BIO RAD AG50W-XB CATION EXCHANGE RESIN IN MIXED NITRIC-HYDROCHLORIC ACID SOLUTIONS

Solvent Extraction and Ion Exchange ◽

10.1080/07360298908962334 ◽

1989 ◽

Vol 7 (4) ◽

pp. 735-747 ◽

Cited By ~ 5

Author(s):

F.W.E. Strelow

Keyword(s):

Hydrochloric Acid ◽

Ion Exchange ◽

Cation Exchange ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Distribution Coefficients ◽

Chloride Complex ◽

Acid Solutions ◽

Hydrochloric Acid Solutions ◽

Exchange Behaviour

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Study on Synthesis of Ester of Citric Acid and Palmityl Alcohol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.900.361 ◽

2014 ◽

Vol 900 ◽

pp. 361-364

Author(s):

Xiao Hui Wang ◽

Xi Hua Du ◽

Li Min Dong

Keyword(s):

Reaction Time ◽

Citric Acid ◽

Cation Exchange ◽

Sulfonic Acid ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Molar Ratio ◽

Esterification Reaction ◽

Process Conditions ◽

Toluene Sulfonic Acid

Esters of Citric acid and palmityl alcohol were synthesized by esterification reaction under catalysis of cation exchange resin and P-toluene sulfonic acid respectively. The effects of amount of catalyst, ratio of raw materials, reaction time and temperature on the synthesis reaction were investigated . The experimental results showed that optimum of process conditions were 1:1~1:1.5 molar ratio of citric acid and palmityl alcohol, reaction temperature of 130~140°C, reaction time of 2 h. Conversion of palmityl alcohol were all more than 90% under 0.3% dosage using p-toluene sulfonic acid as the catalyst, or 0.5% dosage using 721 cation exchange resin with sulfonic acid type as catalyst. The synthesized product had good surface activity.

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Ion Exchange Method for Rapid Determination of Alkalinity of Water-Soluble Tea Ash Containing High Levels of Manganese

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/63.3.460 ◽

1980 ◽

Vol 63 (3) ◽

pp. 460-461

Author(s):

Saidul Z Qureshi ◽

Fadhil M Najib ◽

Fahmi A Mohammed

Keyword(s):

Ion Exchange ◽

Cation Exchange ◽

Exchange Resin ◽

Rapid Determination ◽

Cation Exchange Resin ◽

Water Soluble ◽

Exchange Method ◽

Strong Cation Exchange ◽

Ion Exchange Method

Abstract An ion exchange method to determine the alkalinity of water-soluble tea ash containing high levels of manganese is described. A chromatographic column containing a strong cation exchange resin (20–50 mesh) in Na+ form, with a bed volume of 5 mL is used. The present ion exchange method is compared to pH titrations and also to the official AOAC methods (31.012, 31.015, 31.016). Results with the new method are accurate and precise.

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