Sample preparation of a laboratory sample can involve all of the following,except:
A) laboratory samples that do not dissolve under mild conditions may require acid digestion or fusion.
B) organic material may be destroyed by combustion or wet ashing.
C) solids are typically dried at 110 oC at atmospheric pressure to remove absorbed water prior to analysis.
D) a portion of a course solid laboratory sample should be ground into a fine powder for analysis.
E) temperature-sensitive samples may be stored in an environment to achieve a constant,reproducible moisture level.
Correct Answer:
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Q1: What mass of a solid sample containing
Q3: A mixture contains 2.5% KBr and 97.5%
Q4: For random errors,the overall variance,
Q5: _ dissolves substances that will not dissolve
Q6: Sample storage is an important aspect of
Q7: _uses a small volume of chromatographic stationary
Q8: Which samplng term is incorrectly defined?
A)laboratory sample
Q9: All of the following are used to
Q10: What mass will give a sampling standard
Q11: To calculate the number of required replicates
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