Skolnik Introduction To Radar Solution Manual 113 ((HOT))
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In the selection of extraction solvent for the analysis of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in environmental samples, only the addition of an acidic solution of 1% (w/v) sodium chloride to the extraction solvent is regarded as an effective pretreatment. Although this approach can effectively reduce the background noise during the sample preparation step, the use of an acid solution is apt to produce pH changes in the sample solution itself. In this study, the reactivity of sodium chloride to the stability of PCDD/Fs in the sample solution at different pH values was investigated. The results indicated that the reactivity of sodium chloride to the stability of PCDD/Fs in the sample solution at different pH values was not affected when the concentration of sodium chloride was kept at the recommended amount and when the extraction solvent was changed from methanol to dichloromethane. However, the stability of the target compounds was deteriorated when the methanol solution with a pH value of 2.0 was replaced with the dichloromethane solution with a pH value of 3.3. In addition, the reactivity of sodium chloride to the stability of PCDD/Fs in the sample solution was inversely related to the sample matrix.
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One of the drawbacks to this approach was that we needed to recompile every time we made even a small change to the code. This slowed everything else we were doing down and because we couldn't always have someone waiting for the application to finish building. 827ec27edc