Specific operation of quartering sampling

Grind the sample according to the determination requirements, pass through a sieve with a certain aperture, then mix, flatten it into a circle, divide it into four equal parts, take two opposite parts, mix them and divide them into equal parts until they meet their own requirements.

The specific operation depends on the situation:

For example, liquid: in order to facilitate mixing, mix well before sampling.

Solid: finely ground, evenly mixed and sampled. Mixing can be divided into four parts.

Assuming that the total number of samples is x,

(1) When the total number of samples x is less than or equal to 3, take each sample;

② The total number of samples is 3.

③ When the total number of samples is X & gt300, the number of samples is (√X /2)+ 1.

There's another way.

1, divided into four equal parts on average.

2. Take two out of four.

3. Divide the rest into four equal parts.

4. Take two out of four.

5. Until the end.