A blank solution is a solution that does not contain the analyte, or the substance of interest being tested or measured. It is typically prepared using the same reagents and procedure as the sample solution but without adding the analyte. The primary purpose of preparing a blank solution is to account for any background interference or contamination that may affect the accuracy and reliability of the analytical method.
In some experimental cases, the reagents, solvents, or lab equipment used in an analysis can produce a detectable signal. By measuring the blank solution, this background signal can be determined and subtracted from the measurements of the sample solutions to ensure that the observed signal is solely attributed to the analyte. The laboratory environment can also introduce contaminants such as dust, airborne particles, or residues from previous experiments. Thus, blank solutions help identify and correct contamination during the sample preparation or analysis.
Moreover, the blank solution is sometimes used to calibrate instruments or measurement systems. By establishing a baseline with the blank solution, the instrument's response can be standardized and provide accurate measurements that can be obtained for subsequent sample analysis.
A solution containing all the components of the analysis, except for the analyte, is known as a blank solution.
Under identical conditions, the blank solution is measured with the same instrument as the standard solution and test sample. This blank determination reveals any systematic error and errors caused by the impurities in the reagents and solvents.
The blank's value is subtracted from all subsequent measurement values, such as from the standard solutions or the test sample, to eliminate error. While the values from the blank and standard solution generate the calibration curve, the value obtained from the test sample is used to determine the unknown concentration of the analyte accurately.
In titrimetric analysis, blank solutions are used to eliminate errors caused by impurities in the titrant.
繁體中文
