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2022

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11

Classification of non-hazardous reagents: The properties and storage requirements of non-hazardous reagents can be divided into:

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(1) Light easily deteriorated reagents

Refers to the influence of ultraviolet light, easy to cause the decomposition of the reagent itself, or promote the chemical change of the reagent and the composition in the air. Such as nitric acid, silver nitrate, ammonium sulfide, ferrous sulfate and so on.

(2) reagents that are easy to deteriorate in case of heat

Most of these reagents are biological products and unstable substances, which can be decomposed, moldy and fermented at high temperatures, and some are also at room temperature. Such as ammonium nitrate, ammonium bicarbonate, AGAR, etc.

(3) Freezable reagent

The melting point or freezing point of this kind of reagent is within the temperature change, when the temperature is higher than the melting point, or falls below the freezing point, the reagent volume due to melting or solidification expansion or contraction, easy to cause the cracking of the reagent bottle. Such as glacial acetic acid, crystal sodium sulfate, crystal sodium iodate and bromine aqueous solution.

(4) weathering reagent

Such reagents themselves contain a certain proportion of crystallized water, usually crystals. At room temperature in dry air (general relative humidity below 70%) can gradually lose part or all of the crystalline water and some into powder. It is not easy to master its content when using. Such as crystalline sodium carbonate, crystalline aluminum sulfate, crystalline magnesium sulfate, cholerum, alum and so on.

(5) deliquescence reagent

This kind of reagent is easy to absorb moisture (moisture) in the air to produce deliquation, deterioration, shape change, content reduction and even mildew. Such as ferric chloride, anhydrous sodium acetate, methyl orange, AGAR, reduced iron powder, aluminum silver powder and so on.

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