Semiquantitative Spectrochemical Analysis

Spectrochemical methods are useful for what has become known as semiquantitative analysis. Frequently it is not necessary to have high-precision results and often it is only necessary to determine if an element has a concentration above or below some specified concentration. Several different techniques are available to determine the concentration level of an element in a sample and also to obtain semiquantitative data. In spectrochemical analysis semiquantitative results usually imply an accuracy of 

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Harvey developed a comprehensive method of semiquantitative spectrochemical analysis involving careful control of a large number of... 

FIGURE 7-6. Electrode design for semiquantitative spectrochemical analysis by the Harvey method standard cup electrode, 10 mg size. Dimensions in inches. [Courtesy Applied Research Laboratories.]... 

Qualitative and Semiquantitative Arc—Spark Emission Spectrochemical Analysis... 

Harvey s original work (1947), in which he published k values for 42 elements in 36 different matrices, illustrated the significance of matrix effects on spectrochemical analytical data. If all samples could be reduced to a common matrix, semiquantitative and quantitative spectrochemical analysis could be simplified. A method to accomplish this, in part, involves the addition of another substance to the sample. The added substance is frequently referred to as a spectroscopic buffer and is added in sufficient quantity to become a major constituent of the sample mixture. 

A semiquantitative method of spectrochemical analysis based on Strock s work was developed by Rudolph. 

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