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Chapter: Modern Analytical Chemistry: Gravimetric Methods of Analysis

Particulate Gravimetry: Evaluating Particulate Gravimetry

The scale of operation and detection limit for particulate gravimetry can be ex- tended beyond that of other gravimetric methods by increasing the size of the sample taken for analysis.

Evaluating Particulate Gravimetry

The scale of operation and detection limit for particulate gravimetry can be ex- tended beyond that of other gravimetric methods by increasing the size of the sample taken for analysis. This is usually impossible for other gravimetric meth- ods because of the difficulty of manipulating a larger sample through the indi- vidual steps of the analysis. With particulate gravimetry, however, the part of the sample that is not analyte is removed when filtering or extracting. Conse- quently, particulate gravimetry is easily extended to the analysis of trace-level analytes.

Except for methods relying on a quartz crystal microbalance, particulate gravimetry uses the same balances as other gravimetric methods and is capable of achieving similar levels of accuracy and precision. Since particulate gravime- try is defined in terms of the mass of the particle itself, the sensitivity of the analysis is given by the balance’s sensitivity. Selectivity, on the other hand, is de- termined by either the filter’s pore size or the properties of the extracting phase. Particulate gravimetric methods based on filtration are generally less time-, labor-, and capital-intensive than other gravimetric methods since they require only a filtration step.

 

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