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Method Development and Sampling Techniques
Blank Solutions in Analytical Testing
Description
Blank solutions are used in analytical testing to show the background signal before a sample is measured. A blank solution does not contain the analyte, which is the substance of interest being tested or measured. It is usually made with the same reagents and procedure as the sample solution, but without the analyte.
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Transcript
包含分析的所有组分(分析物除外)的溶液称为空白溶液。
在相同条件下,使用与标准溶液和供试品相同的仪器测量空白溶液。这种空白测定揭示了任何系统误差以及由试剂和溶剂中的杂质引起的误差。
从所有后续测量值(例如标准溶液或测试样品)中减去空白值,以消除误差。空白溶液和标准溶液中的值生成校准曲线,而从测试样品中获得的值用于准确确定分析物的未知浓度。
在滴定分析中,使用空白溶液来消除滴定剂中杂质引起的误差。
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