Analytical techniques used in laboratories encompass a wide range of methods, each suited to specific types of analysis and sample properties. These techniques can broadly be categorized into elemental analysis, particle size analysis, and sample preparation for spectroscopy.
Elemental Analysis: Laboratories often use techniques such as optical emission spectrometry (OES) and laser-induced breakdown spectrometry (LIBS) for direct elemental analysis of workpieces. These methods do not require extensive sample preparation but have limitations in analytical capabilities compared to benchtop XRF spectroscopy. Additionally, they may leave visible marks on the workpieces, which can be a drawback despite their convenience.
Particle Size Analysis: The determination of particle sizes and distributions is crucial in many analytical and industrial processes. Common methods include sieve analysis, direct image analysis (both static and dynamic), static light scattering (SLS), and dynamic light scattering (DLS). Sieve analysis, for instance, is a traditional method that can measure solid particles ranging from 125 mm down to 20 μm. This method is specified in numerous national and international standards, detailing the required sieve sizes, sample sizes, test durations, and expected results.
Sample Preparation for Spectroscopy: For spectroscopic analysis, such as Fourier Transform Infrared Spectroscopy (FTIR) and X-ray fluorescence (XRF), sample preparation is essential. Techniques like the pressed pellet technique involve mixing a small amount of finely ground solid sample with potassium bromide and compressing it into a thin, transparent pellet using a hydraulic press. This preparation allows for the analysis of the sample without interference from the sample's physical form.
Equipment and Materials: The use of specialized lab equipment like platinum labware, high-performance fusion furnaces, and chemistry-specific molds enhances the accuracy of both quantitative and qualitative analysis. These tools facilitate non-destructive testing, ensuring that the sample integrity is maintained throughout the analysis process.
In summary, laboratory analytical techniques are diverse and tailored to the specific needs of the sample and the type of data required. From elemental analysis to particle size determination and sample preparation for spectroscopy, each method has its advantages and limitations, and the choice of technique depends on the specific requirements of the analysis.
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