Solid samples often must be crushed or ground to create particles of smaller ave

Question

Solid samples often must be crushed or ground to create particles of smaller average size prior to analysis. However, during this sample preparation, contamination or composition changes can occur.

Correctly choose what kinds of contamination AND compositional changes will occur during sample preparation involving crushing and grinding?

Blackboax v D https://uc × D https://uc × v D https://uc × D https://uc X e Study c Dwww.saplinglearning.ca/ibiscms/mod/ibis/view.php?id=185476 ×y .. Universit × Please Sh × G Solid sam × a Evaluate x O Classroomx Question 7 of 10 Due Poir Gra Des Map sapling leaming Solid samples often must be crushed or ground to create particles of smaller average size prior to analysis. However, during this sample preparation, contamination or composition changes can occur. Bas Correctly choose what kinds of contamination AND compositional changes will occur during sample preparation involving crushing and grinding? Poli You Contamination: increased ionization due to contact with grinding metal that introduces highly reactive species. Composition: thermal reactions can change the molecular structure, causing inaccurate results when analyzed You You Contamination: grinding causes contamination by heating the sample, initiating thermal you O reactions in the material. Composition: grinding causes changes in the particle size, which You in ans changes the atomic arrangement. Contamination: contamination between prepared samples and from the grinding tool that loses material from wear and abrasion. Composition: loss of volatile compounds, loss/gain of water, nonuniform grinding due to variable hardness, atmospheric reactions. O For Contamination: contamination from the grinding tool that wears off during preparation Composition: material atomization from grinding prevents accurate analysis ENG8:01 PM US 2016-01-15

Explanation / Answer

Solution :-

The contamination that can ocurr in the sample during the crushing and grinding are

Cross contamination = means suppose we used the grinding or crushing apparatus which was previously used to prepare samples of the other material then the traces of the previous sample can contaminate the new sample. This can be avoided by cleaning the grinding or crushing apparatus before use.

The other kind of contaminations are if the sample is kept open in then it can absorb the water from the atmosphere which can also affect the compositions of the sample.

If the sample is kept in the sunlight for the longer time then it can also affect composition of the sample.

Contamination of the sample may also occur if impure reagents are used to make the sample.

The difference in the hardness of the sample during the crushing can also causes the contamination

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