At present, in the process of environmental water quality monitoring, water quality detectors are needed to measure the pollutant indicators of water samples. In this process, there are many friends have appeared measurement data will be unstable, drift phenomenon, the emergence of these situations, no doubt to the user has brought a lot of trouble. There are many reasons for the formation of interference, both may be the cause of the water quality analysis instrument itself, but also may be the cause of the environment. Then what factors will interfere with the measurement data of water quality online monitor ? The following is a brief introduction by yi yun Tian:

The measurement data of the online water quality monitor can be disturbed by the following factors:

1. Preheating effect

After starting up, the water quality online monitor was directly measured without preheating, for some water quality analysis instruments, it must be preheated for at least 10 minutes before they can be used.

2, temperature impact

users should pay attention to whether the temperature of the working environment changes, such as the switch of the air conditioner, high and low changes in ambient temperature, changing the workplace without sufficient preheating, etc. Under normal circumstances, as the temperature rises, the detection value of the water quality online monitor will be lower than the actual value; the user should complete the test as soon as possible in a short time, and should not be tested and compared repeatedly.

3, sample temperature influence

For example, for some pollutant indicators that need to be digested, after the digestion is cooled by air and water, the temperature of the sample should be as close to room temperature as possible before testing.

4. Impact of air pollution

There is serious air pollution in the work environment, for example, when measuring COD index, the concentration of chloride ion in the air is very high, because sulfuric acid has the characteristics of adsorption, chloride ion dissolved in the sample, will affect the measurement results of the water quality online monitor.

5, the influence of impurities and suspended substances in the water sample

If necessary, the water sample to be tested can be filtered, adsorbed, etc. After the pretreatment process, measure again.

In summary, there are some factors that interfere with the measurement data of the water quality online monitor. In order to effectively ensure the accuracy of the measurement data, we should also ensure the accuracy of the instrument detection and the standardization of the operator, so that we can fundamentally ensure the accuracy of the water quality detection and analysis results.