sampling
Quick Summary
In analytical chemistry, sample preparation is a crucial process that begins with sampling. Sampling involves extracting a representative portion of a larger material for analysis. This initial step is vital because it determines the relevance and accuracy of all subsequent analytical work.12
The goal of sampling is to obtain a microcosm that accurately reflects the larger system being studied. This is particularly important for heterogeneous materials, where variations in composition can occur spatially or over time. Different types of materials, such as solids, liquids, and gases, require specific sampling techniques to ensure representativeness. For instance, sampling a lake for pollutants necessitates collecting water from various locations and depths, not just a single spot.234
Following sampling, sample preparation readies the extracted material for measurement. This can involve converting the sample to a solution, isolating or concentrating the analyte, or chemically altering it to facilitate analysis. The accuracy of any chemical analysis hinges on the correct execution of each step, starting with proper sampling.12
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