Download Progress in Medicinal Chemistry, Vol. 15 by G.P. Ellis, G.B. West (Eds.) PDF

By G.P. Ellis, G.B. West (Eds.)

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The estimation of the 13C content in carbonate, resulting from 13C02 trapping, involves the reaction with 100%phosphoric acid under rigorously controlled conditions originally described over 25 years ago [96]. Finally, organic samples requiring analysis of 13C isotopic content, may be combusted in a stream of oxygen to provide the carbon dioxide for isotopic analysis. Several combustion systems have been used that differ only in minor components designed to remove contaminants such as sulphur or the halogens [97,98].

The estimation of the 13C content in carbonate, resulting from 13C02 trapping, involves the reaction with 100%phosphoric acid under rigorously controlled conditions originally described over 25 years ago [96]. Finally, organic samples requiring analysis of 13C isotopic content, may be combusted in a stream of oxygen to provide the carbon dioxide for isotopic analysis. Several combustion systems have been used that differ only in minor components designed to remove contaminants such as sulphur or the halogens [97,98].

S. 6. Direct counting bridge system for isotope ratio measurement Adjustment of the divider to attain a given pen position on a potentiometric recorder provides the ratio from the sum of the divider and recorder readings. 5) is arranged such that the recorder slidewire forms part of the bridge measuring circuit and is thus an integral part of the resistor divider network. The output from both the divider network and the minor amplifier are fed to the recorder comparator and as the null point of the bridge is within the servo loop of the recorder, balance is obtained over the entire range of the recorder chart.

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