The disadvantages of producing a laboratory sample from a gross sample by crushing and grinding include:
1. Composition Change: Crushing and grinding can lead to a significant change in the composition of the gross sample. Decreasing the particle size increases the available surface area, which can result in the loss of volatile components. This is particularly problematic when dealing with samples that contain volatile substances.
2. Frictional Heat: The process of crushing and grinding generates frictional heat, which can further alter the composition of the sample. The heat can cause chemical reactions or degradation of certain components, leading to inaccurate results in subsequent analysis.
3. Loss of Homogeneity: Crushing and grinding may not result in a homogenous sample. The process itself can introduce variability and unevenness in particle size distribution, making it difficult to obtain a representative sample for analysis.
4. Contamination: The equipment used for crushing and grinding may introduce contaminants into the sample. This can compromise the accuracy and reliability of the analysis, especially in cases where trace elements or contaminants are of interest.
5. Time and Cost: Producing a laboratory sample from a gross sample by crushing and grinding can be time-consuming and expensive. The process requires specialized equipment and skilled operators, which adds to the overall cost and duration of sample preparation.
Overall, while crushing and grinding are important steps in sample preparation, they can introduce various disadvantages that need to be carefully considered to ensure accurate and reliable analysis results.
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