E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

How to improve the accuracy of the water quality analyzer?

by:BOQU     2021-08-04

1. Fully airtight system

The connection of the Karl Fischer reagent liquid path must be fastened, from the reagent bottle to the metering pump to the reaction tank, otherwise, the leakage of the reagent will directly affect the test results. Another problem with its non-sealing is that the Karl Fischer reagent absorbs air moisture during the test, which will cause the end of the titration to be delayed.

2. The precise problem of sampling

When calibrating the Karl Fischer reagent, it is necessary to take 10mg of water, and try to use a 10ul sampler, which is not only accurate but also fast, but also can prevent the adhesion of water droplets. Similarly, the use of methanol reagent. Ethyl ester has similar problems. After the handling is completed, attention should be paid to shorten the time when the reaction cell is opened as much as possible.

3. Magnetic mixing speed adjustment

In the reaction cell, because the titration reagent is in the part when it is added, it is not in the same place with the electrode, so the mixing speed is so fast that no turbulence is formed so that the end can be reached as soon as possible.u200b

4. The titration speed setting should be fast and then slow

Drop punctuality first to shorten the experimental time as much as possible, and strain slowly towards the end, which can improve measurement accuracy.

5. Be sure to empty the Karl Fischer reagent in the system

Then clean it with methanol. Never use water to clean the system. Because it is not easy to volatilize, the reagent calibration will be incorrect in the next experiment.

6. The portable water analyzer should be kept away from strong magnetic fields

Prevent electronic display beating and abnormal phenomena during work. The portable water analyzer, because it is necessary to use the glass active burette to measure the Karl Fischer reagent and the methanol solvent, and the glass burette itself is due to the connection of the equilibrium pressure. It is necessary to communicate with the outside world.

7. The system is as tight as possible

The manual moisture analyzer needs to add a U-shaped tube filled with desiccant to the top of the suction bulb pipe and the glass burette to reduce the interference of air moisture on the test results. In an environment where the relative humidity of the air is greater than 70%, the moisture test should not be arranged as much as possible.

8. When adjusting the titration speed of the burette, adjust it to 1 drop/sec.

The titration speed is too fast will lead to a larger delay error when the end is reached; while the titration speed is too slow will extend the process of the test, the above-mentioned disturbances simply lead to the delay in reaching the end.

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