In this paper,an electrochemical formaldehyde meter is used to measure indoor formaldehyde.The sources of un-certainty that may be introduced into the measurement are analyzed and evaluated,and multiple uncertainty components are quantified and synthesized to obtain the extended uncertainty.The results show that the uncertainty introduced into the meas-urement repeatability of the formaldehyde standard air source tube contributes the most to the synthetic uncertainty,followed by the maximum allowable error of the temperature measuring instrument,the measurement repeatability and the uncertainty intro-duced into the certificate parameter of the formaldehyde standard air source tube.
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