The following is a detailed explanation of the storage method for water quality analysis reagent kits, covering core points such as environmental control, container management, operating standards, and safety measures:

1、 Storage environment control

1. Temperature requirements

-Room temperature reagents: Most water quality analysis reagents (such as pH indicators and redox reagents) need to be stored in a dry environment at 15-25 ℃ to avoid volatilization or decomposition caused by high temperatures.

-Low temperature storage reagents: Volatile or thermosensitive reagents (such as sulfide detection reagents and phenolic color reagents) should be stored in a 4 ℃ refrigerator to prevent the active ingredients from becoming ineffective.

-Light shielded storage reagents: Light sensitive reagents (such as cobalt salts and chromates) should be stored in brown bottles and kept in a light shielded cabinet to avoid chemical reactions caused by light exposure.

2. Humidity control

-The environmental humidity should be below 60%. Excessive humidity may cause the reagent to absorb moisture and clump (such as EDTA titrant, sodium chloride standard solution), affecting the accuracy of concentration.

-It is recommended to use dehumidifiers or place silicone desiccants in storage cabinets in humid areas.

3. Air circulation

-The storage space needs to be well ventilated to avoid the risk of explosion caused by the accumulation of volatile organic reagents (such as acetone and methanol) vapor.

-Do not store reagent kits in sealed metal cabinets, especially those containing strong oxidants or flammable solvents.

2、 Container and packaging specifications

1. Integrity of original packaging

-Unused reagents should be kept in their original factory sealed packaging to avoid being transferred to incompatible containers. For example, standard solutions in glass ampoules need to be sealed with wax or plastic film at the bottle mouth.

-After opening, the reagents should be labeled with the opening date and given priority for use to prevent contamination caused by long-term exposure.

2. Container material selection

-Glass container: Suitable for most liquid reagents (such as acidity titrants), but avoid using ordinary glass to store hydrofluoric acid (plastic bottles should be used).

-Plastic container: Used for storing corrosive reagents such as hydrochloric acid and sulfuric acid. HDPE or PP materials are recommended to prevent PVC containers from reacting with alcohol solvents.

-Incompatibility example: Carbon tetrachloride (CCl ₄) cannot be sealed with rubber plugs as it will dissolve the rubber; Alkaline solutions (such as NaOH) should not be stored in glass bottles for a long time, as silicates in glass may react with alkali.

3. Sealing inspection

-Regularly check whether the bottle cap is loose or the sealing ring is aging, especially for volatile reagents such as ammonia and chloroform.

-Use Parafilm film film to assist in sealing, or add a layer of cling film to wrap around the bottle mouth to enhance sealing.

3、 Classification storage and identification management

1. Classification of hazardous properties

-Oxidative reagents (such as potassium permanganate and potassium dichromate) should be stored separately from reducing reagents (such as ferrous ammonium sulfate) to prevent violent reactions.

-Flammable reagents (such as ethanol) should be stored separately in explosion-proof cabinets, away from heat sources and sources of fire.

-Toxic reagents (such as mercury ion indicators and arsenides) need to be locked and managed, and skull markings should be posted.

2. Validity period management

-Establish a reagent inventory list, store them by production date and expiration date, and follow the principle of "first in, first out".

-Reagents nearing expiration should be isolated separately and labeled with a prominent label, with priority given to non critical experiments.

3. Standardization of Labels

-All reagent bottles must be labeled with their name, concentration, preparation date, expiration date, and storage conditions.

-Use waterproof labels or chemical label pens to avoid blurry or peeling handwriting.

4、 Key points for storing special reagents

1. Standard solution and reference substance

-The standard solution (such as 1000mg/L heavy metal reserve solution) should be refrigerated in the dark and the concentration should be calibrated regularly.

-The reference substance (such as COD digestion solution) should be stored separately from conventional reagents to avoid confusion.

2. Biosensitivity reagents

-Microbial culture reagents (such as colony count test strips) need to be sealed and frozen for storage, and restored to room temperature before use.

-Enzyme reagents (such as glucose oxidase) should be stored below -20 ℃ to avoid repeated freezing and thawing.

3. Gases and volatile reagents

-Compressed gas cylinders such as hydrogen and hydrogen sulfide need to be fixed and standing, with empty and full cylinders placed separately.

-Volatile liquids (such as benzene based extractants) should be stored in a fume hood with the bottle mouth facing outward for easy inspection of leaks.

5、 Inventory inspection and maintenance

1. Regular inspections

-Check the appearance of the reagent once a month to observe whether there is precipitation, discoloration, or layering (such as iodine crystals that precipitate from iodine solution and need to be dissolved again).

-Use pH test strips to check if the buffer solution is ineffective. If the pH value deviates from the nominal value by ± 0.2, it needs to be replaced.

2. Waste disposal

-Expired or deteriorated reagents should be classified and disposed of according to the "List of Hazardous Waste". If the waste liquid contains heavy metals, it should be entrusted to a professional organization for disposal.

-Empty reagent bottles should be cleaned and recycled, and containers with residues should be treated as hazardous waste.

6、 Safety and emergency measures

1. Fire and explosion prevention

-Open flames are prohibited in the storage area, and carbon dioxide fire extinguishers or dry powder fire extinguishers should be equipped.

-Install gas alarm devices in the volatile reagent storage area and set leakage warning thresholds.

2. Emergency response to leakage

-A small amount of liquid leakage should be adsorbed with absorbent cotton, while a large amount of leakage should be covered with sand and isolated from the contaminated area.

-Acidic reagent leakage can be neutralized with caution using sodium bicarbonate, but it is necessary to avoid violent reactions that generate heat.

3. Personnel protection

-Wear nitrile gloves, goggles, and lab clothes when retrieving reagents, and wash hands after operation.

-Regularly train laboratory personnel to master the content of chemical MSDS (Safety Data Sheet).