High Sensitivity Thermochemical Analysis

Earl B. Smith; Charles S. Barnes; Peter W. Carr

doi:10.1021/ac60317a010

High Sensitivity Thermochemical Analysis

Earl B. Smith, Charles S. Barnes, Peter W. Carr

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

A lock-in amplifier and linear ramp generator system has been developed which permits an rms temperature resolution of 3-4 m°C. This temperature resolution approximates the theoretical Johnson noise limit of the signal source. The system was employed to improve the sensitivity of thermometric analysis. In a 100-ml calorimetrie vessel, solutions of 15 nM perchloric acid have been titrated with sodium hydroxide with a precision and accuracy of better than 10%. This reaction generated 20 millicalories of heat and caused a temperature change of approximately 0.2 m°C. At higher concentrations (1.5mM) the optimum precision achieved was 0.2%, which is the limiting precision of the volume delivery device.

Original language	English (US)
Pages (from-to)	1663-1669
Number of pages	7
Journal	Analytical chemistry
Volume	44
Issue number	9
DOIs	https://doi.org/10.1021/ac60317a010
State	Published - Aug 1 1972

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abstract = "A lock-in amplifier and linear ramp generator system has been developed which permits an rms temperature resolution of 3-4 m°C. This temperature resolution approximates the theoretical Johnson noise limit of the signal source. The system was employed to improve the sensitivity of thermometric analysis. In a 100-ml calorimetrie vessel, solutions of 15 nM perchloric acid have been titrated with sodium hydroxide with a precision and accuracy of better than 10%. This reaction generated 20 millicalories of heat and caused a temperature change of approximately 0.2 m°C. At higher concentrations (1.5mM) the optimum precision achieved was 0.2%, which is the limiting precision of the volume delivery device.",

author = "Smith, {Earl B.} and Barnes, {Charles S.} and Carr, {Peter W.}",

year = "1972",

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N2 - A lock-in amplifier and linear ramp generator system has been developed which permits an rms temperature resolution of 3-4 m°C. This temperature resolution approximates the theoretical Johnson noise limit of the signal source. The system was employed to improve the sensitivity of thermometric analysis. In a 100-ml calorimetrie vessel, solutions of 15 nM perchloric acid have been titrated with sodium hydroxide with a precision and accuracy of better than 10%. This reaction generated 20 millicalories of heat and caused a temperature change of approximately 0.2 m°C. At higher concentrations (1.5mM) the optimum precision achieved was 0.2%, which is the limiting precision of the volume delivery device.

AB - A lock-in amplifier and linear ramp generator system has been developed which permits an rms temperature resolution of 3-4 m°C. This temperature resolution approximates the theoretical Johnson noise limit of the signal source. The system was employed to improve the sensitivity of thermometric analysis. In a 100-ml calorimetrie vessel, solutions of 15 nM perchloric acid have been titrated with sodium hydroxide with a precision and accuracy of better than 10%. This reaction generated 20 millicalories of heat and caused a temperature change of approximately 0.2 m°C. At higher concentrations (1.5mM) the optimum precision achieved was 0.2%, which is the limiting precision of the volume delivery device.

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High Sensitivity Thermochemical Analysis

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