Objective In chemical analysis,the focus used to be on the precision and accuracy of detection results.However,many testing activities currently require establishing the credibility of the results.Especially by measuring the credibility of the results to prove their suitability,this generally includes the degree to which one outcome is expected to match other outcomes,which is also the significance of exploring uncertainty.Methods According to the CNAS-GL06 Guidelines for Evaluation of Uncertainty in Chemical Analysis,this article detected the content of phosphate ions in a certain industrial wastewater and studied and analyzed the components that affect measurement uncertainty during the experimental process.Results Through calculation,it can be concluded that when the result of phosphate ion is 3.00 mg/L,the confidence interval is 2.86-3.14 mg/L(k=2).Conclusion The main factor affecting its measurement uncertainty is the uncertainty introduced by the calibration curve fitting.In order to make the detection results more scientific and accurate,it is necessary to pay attention to the maintenance and upkeep of the ion chromatograph in daily work,minimize the background noise of the instrument,and improve the sensitivity and accuracy of the instrument.
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