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Judgment of the main indicators of the trace element analyzer are the following:
1. Repeatability: Repeatedly measuring the same sample or measuring the error of multiple samples with the same content, generally expressed by the coefficient of variation, the smaller the better, this indicator is mainly the credibility of the expression instrument, precision and stability.
2. Lower detection limit: It refers to the lowest limit of the detectable content. Generally speaking, it uses triple noise as the standard. Generally, it uses low-contamination and high-sensitivity elements such as electrochemical detection with cadmium ions and atomic absorption with copper ions. This indicator indicates the sensitivity of the instrument.
3. Correlation coefficient: The regression coefficient for different concentrations of elements and linear equations, the maximum is 1, at least 0.99 or more.
4. Calibration curve deviation: The difference between a known amount and a certain point of the standard curve is smaller, the better, generally less than 10%.
The two terms 3 and 4 express the accuracy of the instrument. No matter what the principle instrument is, it must meet the most basic requirements of the analytical instrument before it can be used for actual detection.
At present, the trace element analyzers on the market are mainly divided into three categories:
One is the detection through optical principles. The process is simple and inexpensive, but the test results are inaccurate. Most of them are used to promote health products. Hospital clinics must not be used.
One is atomic absorption spectrometry. This instrument has accurate detection results, but its one-time investment is too high and the operating cost is high. Generally, it is only suitable for hospitals with more than three grades.
One is the electrochemical analysis method. The instrument price is moderate, the test results are accurate, and it meets the requirements of the hospital. There is a clear national inspection standard. The hospital's one-time investment is not high, and the operating cost is low, such as county-level hospitals, township hospitals, and maternity and child care hospitals. The most appropriate use of the CDC, as well as private hospitals and clinics, is the electrochemical analysis of trace element detectors.
1. Repeatability: Repeatedly measuring the same sample or measuring the error of multiple samples with the same content, generally expressed by the coefficient of variation, the smaller the better, this indicator is mainly the credibility of the expression instrument, precision and stability.
2. Lower detection limit: It refers to the lowest limit of the detectable content. Generally speaking, it uses triple noise as the standard. Generally, it uses low-contamination and high-sensitivity elements such as electrochemical detection with cadmium ions and atomic absorption with copper ions. This indicator indicates the sensitivity of the instrument.
3. Correlation coefficient: The regression coefficient for different concentrations of elements and linear equations, the maximum is 1, at least 0.99 or more.
4. Calibration curve deviation: The difference between a known amount and a certain point of the standard curve is smaller, the better, generally less than 10%.
The two terms 3 and 4 express the accuracy of the instrument. No matter what the principle instrument is, it must meet the most basic requirements of the analytical instrument before it can be used for actual detection.
At present, the trace element analyzers on the market are mainly divided into three categories:
One is the detection through optical principles. The process is simple and inexpensive, but the test results are inaccurate. Most of them are used to promote health products. Hospital clinics must not be used.
One is atomic absorption spectrometry. This instrument has accurate detection results, but its one-time investment is too high and the operating cost is high. Generally, it is only suitable for hospitals with more than three grades.
One is the electrochemical analysis method. The instrument price is moderate, the test results are accurate, and it meets the requirements of the hospital. There is a clear national inspection standard. The hospital's one-time investment is not high, and the operating cost is low, such as county-level hospitals, township hospitals, and maternity and child care hospitals. The most appropriate use of the CDC, as well as private hospitals and clinics, is the electrochemical analysis of trace element detectors.
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