Generally, the sample retention time is 48 hours, and the sample retention amount of each dish is not less than100g, so that the samples are separated without confusion; After 48 hours, pour the remaining vegetable samples into the trash can, and thoroughly clean and disinfect the sample box to avoid cross-contamination.

It should also be noted that the dishes in the sample box must be cooled before they can be covered and put into the refrigerator. Hot dishes can't be put in the refrigerator. On the one hand, it will increase the temperature in the refrigerator, on the other hand, it will accelerate the deterioration of the sample dishes and fail to achieve the expected results.

Extended data:

1. The following two factors should be considered when choosing a kitchen: First, pay attention to preventing the surrounding enterprises from polluting the kitchen environment and try to avoid enterprises that emit "three wastes" (waste water, waste residue and waste gas). Second, the kitchen had better not be located in the basement, because the basement is not conducive to ventilation, lighting, smoke prevention, moisture-proof, and food is also prone to mildew and deterioration.

2, the kitchen should have measures to eliminate flies, mice, cockroaches and other harmful insects and their breeding conditions.

3, each kitchen for garbage and feces treatment, must comply with the hygiene regulations. Outdoor garbage bins should be easy to clean, prevent insects and rats from entering, prevent sewage from leaking, and treat them on time to protect the surrounding environment from odor, insects and bacteria pollution. The trash can (box) in the kitchen must have a cover and have enough capacity to hold garbage. It must be bagged and managed according to hygiene requirements, and cleaned up in time. The inside and outside of buckets and boxes should be cleaned with hot water and detergent. This work should be arranged at an appropriate time.

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