It is necessary to store a certain amount of chemical reagents when conducting water quality testing. These reagents include purchased finished chemical reagents and various reagents prepared by ourselves. In principle, these reagents should be properly managed by specialized personnel, especially some hazardous chemical reagents, to avoid some problems caused by improper management. At the same time, water quality testing personnel need to pay attention to checking and checking the shelf life of the chemical reagents used regularly to avoid inaccurate water quality parameters caused by the use of expired reagents in the testing.
To avoid this kind of situation, you must first be able to master the chemical properties of various reagents, and secondly, you must know the storage requirements of different types of reagents and the reasons for the deterioration of the reagents in the water quality detector. Only in this way can the effectiveness of the reagent be guaranteed.
Factors that cause deterioration of chemical reagents
1. The influence of reagent air
Oxygen in the air easily oxidizes reducing reagents and deteriorates; for example, strong alkaline reagents will become carbonates after absorbing carbon dioxide in the air; moisture in the air can deliquescence and agglomerate some reagents, in addition to fibers and dust It can reduce or change color of some reagents.
2. The influence of reagent storage temperature
High temperature environment can accelerate the decomposition rate of unstable reagents, but too low ambient temperature also affects some reagents. For example, if the temperature is too low, precipitation and freezing will occur. Therefore, it should be classified and stored according to the characteristics of the reagents used in the water quality detector.
3. Save the influence of ambient light intensity
Ultraviolet rays in sunlight can accelerate the chemical reaction of certain reagents and make them deteriorate (such as silver salt, mercury salt, potassium, sodium, ammonium salt of bromine and iodine, and certain phenolic reagents). Therefore, most reagents need to be stored away from light.
4. The influence of storage environment humidity
Generally, the relative humidity in the air is normal at 40%-70%. If the humidity is too high or too low, it is easy to cause chemical or physical changes in the reagents, which can cause deliquescent, weathering, dilution, decomposition and other changes of different reagents.
5. Reagent impurities
Whether the reagent is pure or not will directly affect its deterioration. Therefore, pay special attention when taking reagents to prevent impurities from affecting the quality of reagents.
6. The influence of reagent during storage period
Some unstable reagents will undergo disproportionation, polymerization, decomposition or precipitation after long-term storage, so be careful when using them.
The above are the reasons that can cause the deterioration of the reagents of the water quality detector. You must remember.
