What are the precautions and methods when sampling for fungal toxin detection
What are the precautions and methods for sampling in fungal toxin detection?
Sampling precautions:
1. Principle of Sampling
Due to the randomness of fungal toxin distribution, sampling should be done at multiple points, randomly, and uniformly, so that each part has the same probability of being selected.
2. Quantity of Sampling
FAO and WTO recommend sampling every 200 kilograms of material. If the sampled material is a relatively evenly mixed powdered material, the number of sampling points can be appropriately reduced. In practical work, due to limited manpower and material resources, the number of sampling points should be determined based on the actual situation of the enterprise and the material situation.
3. Sample size
The sample size for raw material inspection can be 500g for finished products and 1000g for raw material samples, which can ensure the uniformity of the distribution of fungal toxins in the low detection measurement and detection samples.
Specific sampling method:
1. Sampling of flowing materials
Sampling method: Use appropriate sampling equipment and control the speed of the material flow so that the sampler can sample from the entire cross-section of the material flow without overflowing.
Scope of application: Suitable for unloading bulk materials from transport trucks, trains, and ships; Sampling of silo material storage sampling port; Sampling at the packaging outlet of feed enterprises.
2. Sampling of bulk materials
Sampling method: Probe sampler is used. The length of the probe sampler should be able to pierce the bottom of the container.
Scope of application: Suitable for the transportation of bulk materials by barges, hopper cars, box trucks, trucks, train cars, and tank trucks.
3. Sampling of bagged materials
Select an appropriate length sampler and insert the probe sampler diagonally from one corner of the packaging bag to the opposite corner. The length of the sampler should be close to the diagonal length of the packaging bag.
4. Sampling of materials stored in a cylindrical warehouse
For the materials stored in the silo, only by sampling the flowing materials at the discharge outlet can representative samples be obtained. If there is not much material storage in the silo, multiple sampling points can be taken to obtain more representative samples.
5. Sampling of Feed Production Process
Install automatic sampling equipment on the discharge buckle or use a pelican mouth sampler for sampling. Sample the feed that has already entered the warehouse according to the sampling procedure for bagged materials.
6. Sampling of stored feed
Sample the feed that has already entered the warehouse according to the sampling procedure for bagged materials.
7. Sampling of feed and raw materials for breeding farms.
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