Training Tricks in sample prep Quiz

What is the first step in the analytical process?

• Problem definition

• Method selection

• Sample preparation

• Sampling

Which of the following is NOT an attribute of a good analytical chemist?

• Able to develop new methods

• Has a degree in chemistry

• Able to evaluate results

• Understands principles of analysis

What does 'validate' mean in the context of analytical methods?

• Prepare samples for analysis

• Ensure analysts obtain correct results

• Select the appropriate method

• Prove that the method works

Which sampling method is critical for accuracy?

• Destructive sampling

• Homogeneous sampling

• Random sampling

• Representative sampling

What is the purpose of sample preparation?

• To change the sample's physical state

• To increase the sample size

• To obtain a clean sample for analysis

• To analyze the sample directly

Which of the following is a method of sample preparation for organic analytes?

• Drying

• Grinding

• Extraction

• Digestion

What is the acceptable recovery percentage for analytical methods?

• 50 - 70%

• 80 - 120%

• 90 - 110%

• 70 - 90%

What is the main requirement during sample preparations for trace element analysis?

• Use of expensive reagents

• Management of analytical blanks

• High temperature conditions

• Use of complex instruments

What does the term 'homogenize' refer to in sample preparation?

• To analyze the sample

• To dry the sample

• To grind and mix the sample uniformly

• To dissolve the sample in a solvent

Which of the following is a source of error in sample dissolution?

• Proper storage

• Using too much solvent

• Excessive heating

• Incomplete dissolution