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Density refers to the proximity between individual results obtained by multiple sampling using a uniform sample under specified measurement conditions. Precision is generally expressed in terms of deviation or relative standard.
When using standard deviation or relative standard deviation, the number of sampling measurements should be statistically significant, and at least 6 results should be used for evaluation.
Under the same conditions, the precision of the results obtained by one analyst is called repeatability. In the same laboratory, the precision of the results measured by different analysts at different times at different times is called intermediate precision.
The precision of the results measured by different analysts in different laboratories is called reproducibility. When the analytical method is to be adopted by a statutory standard, a reproducibility test should be conducted.
The recovery rate is that when you make a sample, the standard is added. After pre-treatment, the ratio to the original standard may exceed 100%.
The precision check is to reproduce the method between the methods; the relative standard deviation RSD% is generally not more than 2.0%.
The recovery rate is the accuracy of the method method, and the relative standard deviation RSD% is generally not more than 2.0%.
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