Chemical Microstandards from Ion Exchange Resin

Freeman, David H.; Paulson, Rolf A.

doi:10.1038/218563a0

Cited by 14 publications

(4 citation statements)

References 3 publications

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“…The microprobe results as reported [4], imply suitability of the beads as correspondence standards between signal ratio and absolute elemental ratio.…”

Section: Discussionsupporting

confidence: 53%

Separation and Purification Section :

Zielinski¹,

Freeman²

1970

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“…The microprobe results as reported [4], imply suitability of the beads as correspondence standards between signal ratio and absolute elemental ratio.…”

Section: Discussionsupporting

confidence: 53%

Separation and Purification Section :

Zielinski¹,

Freeman²

1970

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“…The amounts ranged from 2 to 100 yg of copper and aluminum, 43 to 3600 yg of nickel, and 35 to 900 yg of chromium.…”

Section: Determination Of Lead In Leaded Steelmentioning

confidence: 99%

Microchemical analysis section:

Taylor¹

1968

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“…This will cause the copolymers to swell, which in turn facilitates access of the electrophilic reagent to the aromatic rings in the rigid structure of the polymer. The need for homogeneity in this reaction, i. e. the provision of one sulfonic group for each aromatic ring and the absence of sulfone bridges, has arisen mainly as a result of new uses of cation exchangers as microstandards [1] and due to the possibility of improving chromatographic methods by means of resins having a well-defined structure.…”

mentioning

confidence: 99%

Homogeneous Sulfonation of Styrene‐Divinylbenzene Copolymers with Oleum in Organic Solvents

Freeman

Goldstein

Schmuckler

1969

Israel Journal of Chemistry

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In order to obtain homogeneously sulfonated cation exchangers, the copolymers were s1'.1fonated by oleum in a mixture of methylene-chloride and nitromethane. The influences of the chemical interaction and of the diffusion process on the kinetic behavior of these systems were investigated, and it was shown that raising the temperature of the sulfonation mixture markedly increases the chemical reaction rate, while the effect on the diffusion is small. A curve-fitting technique was used for the interpretation of the degree-of-sulfonation-vs.time curves. These investigations served as guidelines for the subsequent preparation of homogeneous highly sulfonated copolymers.

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Chemical Microstandards from Ion Exchange Resin

Cited by 14 publications

References 3 publications

Separation and Purification Section :

Separation and Purification Section :

Microchemical analysis section:

Homogeneous Sulfonation of Styrene‐Divinylbenzene Copolymers with Oleum in Organic Solvents

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