【Daily Question】Chemical Analysis Edition, 2021.6.9
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The analytical method in which the sample volume taken is 1–10 mL is called A. Microanalysis, B. Macroanalysis, C. Semi-microanalysis, D. Ultra-microanalysis. B
Choose C. Explanation: An analytical method in which the sample volume ranges from 1 to 10 milliliters is called semi-microanalysis. Based on the amount of sample used in analysis, analysis methods can be divided into: macroanalysis (sample amount > 100 mg, solution volume > 10 ml) ； Semimicroanalysis (sample amount: 10 m–100 mg, solution volume: 1–10 ml) ； Trace analysis (sample amount: 0.1–10 mg, solution volume: 0.01–1 ml) ； Ultra-trace analysis (sample amount used
C Discussion: Here, the “amount of test solution sampled” refers to the volume of test solution taken for analysis during the analytical process, or it refers to the volume of sample collected during the sampling process. Based on the reply from the second floor, I think it is correct. For example, a description like “Accurately transfer 5 mL of sample and follow the steps below…” can generally be understood as referring to a constant value (a quantity commonly used in experiments). However, in practical work, there is no need to worry about whether it is a constant or a semi-micro amount; when solving problems, there is only one correct answer, so one should choose the semi-micro amount.