A Simple Ion-exchange Method for the Determination of Sodium, P otassium, Magnesium and Calcium in Human Saliva. Jun Yoshimura and Keisuke Tachi b a n a 41

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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Collaborative Study of a Zincon Ion Exchange Method for the Quantitative Determination of Zinc in Fertilizers

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/54.4.790 ◽

1971 ◽

Vol 54 (4) ◽

pp. 790-795

Author(s):

C E Jones ◽

L E Pracht

Keyword(s):

Ion Exchange ◽

Quantitative Determination ◽

Atomic Absorption ◽

Reference Data ◽

Collaborative Study ◽

Present Form ◽

Exchange Method ◽

Ion Exchange Method ◽

Absorption Measurements

Abstract This collaborative study represents an attempt to validate the ion exchange zincon method for the quantitative determination of zinc in fertilizers. The values of the standard deviations Sd, Sr, and Sb and the results of the F- and t-tests are presented as an estimate of the precision, accuracy, and dependability. Atomic absorption measurements were also made and provided reference data for evaluation purposes. In its present form, the method falls short of expectations as an alternative wet approach to the dithizone method. It is recommended that the methods for determining zinc in fertilizers be studied further.

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Ion Exchange Method for Determination of Caffeine in Presence of Antipyrine and Phenacetin**Analytical Laboratory of Lääketehdas Orion Oy, Pharmaceutical Manufacturers, Helsinki, Finland.

Journal of the American Pharmaceutical Association (Scientific ed ) ◽

10.1002/jps.3030470406 ◽

1958 ◽

Vol 47 (4) ◽

pp. 248-249 ◽

Cited By ~ 2

Author(s):

Eero Sjöström ◽

Lalli Nykänen

Keyword(s):

Ion Exchange ◽

Analytical Laboratory ◽

Exchange Method ◽

Pharmaceutical Manufacturers ◽

Ion Exchange Method

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Determination of ammonia in blood plasma by an ion exchange method

Clinica Chimica Acta ◽

10.1016/0009-8981(72)90387-7 ◽

1972 ◽

Vol 42 (1) ◽

pp. 141-146 ◽

Cited By ~ 14

Author(s):

Kengo Kurahasi ◽

Akiko Ishihara ◽

Hideo Uehara

Keyword(s):

Ion Exchange ◽

Blood Plasma ◽

Exchange Method ◽

Ion Exchange Method ◽

In Blood Plasma

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Protein-bound phosphorylserine in acid hydrolysates of brain tissue. The determination of [32P]phosphorylserine by ion-exchange chromatography and electrophoresis

Biochemical Journal ◽

10.1042/bj1210597 ◽

1971 ◽

Vol 121 (4) ◽

pp. 597-600 ◽

Cited By ~ 16

Author(s):

D. A. Jones ◽

R. Rodnight

Keyword(s):

Ion Exchange ◽

Specific Radioactivity ◽

Ion Exchange Chromatography ◽

Exchange Chromatography ◽

Exchange Method ◽

Unknown Composition ◽

Ion Exchange Method ◽

Guinea Pig Brain ◽

Cortical Slices

1. Partial acid hydrolysates of proteins derived from cortical slices of guinea-pig brain were divided into two parts and fractionated by ion-exchange chromatography and high-voltage electrophoresis. 2. The apparent yield of protein-bound phosphorylserine by the ion-exchange method was about three times that obtained by electrophoresis. 3. The specific radioactivity of phosphorylserine isolated from 32P-labelled slices by electrophoresis was twice that isolated by chromatography. 4. The discrepancies were found to be due to the presence of unlabelled phosphates of unknown composition in the ‘phosphorylserine’ fraction obtained by the ion-exchange method. 5. Electrical stimulation of slices respiring in the presence of [32P]phosphate increased the specific radioactivity of the total phosphate in the chromatographic ‘phosphorylserine’ fraction by 53±11%, as compared with only 19±5% for the phosphorylserine isolated by electrophoresis.

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