How to sample and divide powder samples?

Usually, samples are divided into four categories: production samples, rough samples, laboratory samples and measurement samples. The mass of the crude sample is in kilogram level, and its sampling has a specific sampler. Take samples from containers. The number of containers to be sampled is specified in Table 9:

Table 9 Number of sampling containers

Number of batch containers

The number of samples to be taken

Batch capacity number

Number of containers from which samples should be taken

1-5

6-11

12-20

21-35

36-60

All

61-99

100-149

150-199

200-299

Table 10 Standard deviations of different reduction methods

Method

Cone quartering

spoon method

grid method

rotation reduction method

Standard deviation of sample

6.81

5.14

1.01

0.125

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