基础化学习题及答案

nicotine. If a 500 mL sample of urine is used and all of the nicotine present is concentrated during sample preparation into a final solution volume of 10.00 mL, what is the minimum concentration of nicotine (in ?g?L-1) that can be detected in urine by the assay?

注:nicotine——尼古丁,urine——尿。

27. A spectrophotometric assay was to be carried out on a compound with κ = 5 000 L?mol -1?cm-1.The stock solution of standard had been made with a concentration of 0.020 3 mol?L-1. Given a path length of 1.000 cm and the fact that the final absorbance should be around 0.40 to 0.5, by what factor should the stock solution be diluted?

注:stock solution——储备溶液

28. 画出单光束原子吸收分光光度计结构方框示意图,并简要说明各部分作用。

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