What does quality control sample mean? quality control sample

　　

　　The detection process involves a lot of processes or steps, or more or less encounter some uncertain factors, which ultimately affect the accuracy of our test results, so how to ensure that our detection is within the controllable range, in other words, how to ensure the validity and comparability of our test results? This requires quality control samples. When it comes to quality control samples, everyone must be familiar with them, that is, what we usually call QC samples. What are the quality control samples? I think there are three main types: blank samples,standard solution(Substance), repetitive samples. Let me talk about the importance of these three in the detection process.

　　Let's start with the blank sample (BLK), but all the standard methods we see have this sentence: make blank with the sample, and some have to make 2. Why do you want to make blank, and what is the significance of making blank? Blank samples can check whether the entire sample processing process is contaminated, whether the reagent has ingredients that need to be tested, how much content, the detection limit of the instrument and the deduction of matrix interference during the detection process.

　　Next, let's talk about the standard material STD (solution). In the standard material, we will generally choose two that are the same or similar to the sample matrix to be tested, with one high or one low element content or component content. Usually, one is placed behind the blank sample, and the other is randomly placed. When purchasing quality control samples and standard solutions, we will go to the National Standards Network for processing the same as the sample. In the pre-processing process, the standard material is mainly used to monitor whether the processing process is abnormal and whether the processing is sufficient and thorough. In the process of instrument testing, it is mainly to check whether the test state of the instrument is normal and whether the working curve is very deviated.

　　Finally, let's talk about the duplicate sample (DUP). A duplicate sample is another sample of the sample that needs to be tested. It is taken from the same sample, and the pretreatment is the same as the sample. The function of a duplicate sample is mainly to check the uniformity and representativeness of the sample. If your test results show that the difference is very large, you have to look for the reason. Is it a mistake in the sample or the poor uniformity of the sample?

　　Summary: Seemingly inconspicuous quality control samples actually play a big role in our testing activities, monitoring the quality of the entire testing process, and providing clues and basis for us to find and analyze quality problems. Many people do not pay attention to it, and they cannot start when there is a problem. Standardized laboratories generally require quality control samples.