Flowing adding sodium analyzer checking method and device

Abstract

The invention discloses a flowing adding sodium analyzer checking method and a flowing adding sodium analyzer checking device. The device comprises a desalting device connected with a water sample, a valve, a flow meter and a checked sodium analyzer; and a trace flow meter, a liquid delivery device, a sodium standard solution valve and a sodium standard solution water tank which are intercommunicated are connected in parallel on a pipeline between the flow meter and the checked sodium analyzer. High-concentration sodium standard solution is continuously added into water flow with extremely low sodium concentration. The dilution ratio of the water sample can be calculated by accurately metering the flow of the water sample and the adding flow of the high-concentration sodium standard solution, so that the sodium concentration increment of the low-concentration sodium standard water sample is calculated. Compared with the conventional high-concentration sodium standard solution static checking method, the sodium standard water sample of any concentration in a range of 1 to 10mug / L can be produced, so the standard water sample with the same or similar concentration as the concentration measured by an online sodium analyzer can be provided, and the accuracy and the reliability of the online sodium analyzer measurement value are greatly improved after the online sodium analyzer is checked and calibrated.

Description

technical field [0001] The invention relates to an online sodium meter inspection method and device, in particular to a flow adding type online sodium meter inspection method and device. Background technique [0002] At present, the existing online sodium meter inspection method at home and abroad is the static inspection method of sodium standard solution. [0003] The main problem that the static test method of sodium standard solution exists is: due to reasons such as the pollution of dust in the air, the pollution of container, preparation low concentration sodium standard solution (concentration of several μ g / L), its uncertainty is bigger; And static test When, the potassium ions leaked from the reference electrode will interfere with the measurement, and the sodium ions produced by the dissolution of the glass electrode will also interfere with the measurement. Therefore, the concentration of the sodium standard solution used in the sodium standard solution static te...

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Problems solved by technology

[0003] The main problem that the static test method of sodium standard solution exists is: due to reasons such as the pollution of dust in the air, the pollution of container, preparation low concentration sodium standard solution (concentration of several μ g / L), its uncertainty is bigger; And static test When the reference electrode leaks potassium ions will interfere with the measurement, and the sodium ions produced by the dissolution of the glass electrode will also interfere with the measurement

Since the slope calibrated in high-concentration sodium standard solution is extended to low-concentration use, the small error in slope calibration will be amplified. At the same time, when the sodium electrode measures low-concentration sodium solution, the electrode response slope will change, resulting in low-concentration sodium. large error

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