On the radiolysis of aqueous sodium formate solutions.

doi:10.2307/3570818

Paper

On the radiolysis of aqueous sodium formate solutions.

Published 1960 · T. J. Hardwick

Radiation research

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Abstract

In a previous paper (1), an air-free aqueous solution of sodium formate was proposed as a chemical dosimeter for light-particle radiation. Although sodium oxalate was the main product, small amounts of other products were found. In spite of this, however, the formation of products titrable with acid permanganate was linear with energy absorbed, independent of formate concentration over a wide range, and independent of temperature and dose rate. The yield (G) was found to be 3.40 molecular equivalents per 100 ev absorbed. The radiolysis of formate ion in the pH range 7 to 12 was first investigated by Fricke et al., (2). Hydrogen gas was produced; carbon dioxide was absent. The authors assumed the formation of oxalic acid in an amount equal to the hydrogen. The radiolysis of aqueous formic acid solutions has been studied by Hart (3-5). Most of this work was carried out in oxygen-saturated solutions, but in one set of experiments, made under air-free conditions, the radiolysis products at pH = 3 were hydrogen gas and carbon dioxide, produced in equal yield (G = 2.63). From the kinetics of the radiolysis of oxygen-saturated formate solutions pH 5 to 11.5, Hart (4) found radical and molecular yields to be constant within experimental error in this pH range. The mean values obtained were: GH = 3.07, GOH = 2.99, G2 = 0.41, and G02 = 0.45. Garrison et al. (6) recently reported the results of helium ion bombardment of air-free formic acid solutions. Among his solute products were oxalic acid, glyoxalic acid, glycolic acid, mesoxalic acid, tartaric acid, and formaldehyde. In one experiment using 10-Mev neutrons on 0.25 M sodium formate, they found oxalic acid (G = 1.2), glyoxalic acid (G = 0.80), and glycolic acid (G = 0.25), with negligible amounts of other solute products. From these data it appeared that the reactions on light-particle radiolysis of sodium formate solutions might be somewhat complicated. It has, however, been shown that the number of reducing equivalents formed is independent of energy absorbed to at least 80% conversion of the formate ion (1). It seems reasonable,

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Light-particle radiolysis of sodium formate solutions produces a complex reaction with oxalic acid, glyoxalic acid, and glycolic acid as main products, but the number of reducing equivalents formed remains independent of energy absorbed.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

On the radiolysis of aqueous sodium formate solutions.

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References

Citations

Pulse radiolysis of sodium formate aqueous solution up to 400 °C: Absorption spectra, kinetics and yield of carboxyl radical CO2−

Pulse radiolysis of sodium formate aqueous solutions with N2O reveals a red shift in CO2 absorption spectra, temperature-dependent kinetics, and significant density effects on Ge (CO2) at 400 °C.

A common carbanion intermediate in the recombination and proton-catalysed disproportionation of the carboxyl radical anion, CO2*-, in aqueous solution.

The bimolecular decay rate constant of CO2*- in aqueous solution is independent of pH, but the yields of CO2 and oxalate anion strongly depend on pH, with an inflection point at pH 3.8.

Synthese organischer stoffe aus Kohlensäure in wässeriger Lösung unter einwerkung von Co60 γ-Strahlung

Co60 gamma rays can reduce CO2 in aqueous solution to organic products like aldehyde, formic acid, oxalic acid, and glycol, with strong dependence on pH and ferric ions providing protection against radicals.