For the method of detecting phosphate by metal molybdenum-based phosphate ion selective electrode

in order to analyze on the main source of measurement uncertainty during the detection process and the credibility of the test result

according to measurement uncertainty evaluation standard

the sources of each uncertainty component and their corresponding standard uncertainties are analyzed and calculated. The results show that the main factors affecting the detection precision of the scheme are the preparation of the standard solution and the precision of the amplification circuit. This study provides theoretical support and basis for improving the detection precision of molybdenum-based phosphate ion selective electrode method.