GB/T 18823-2010Permitted tolerants for judgment of testing results in feeds (English PDF)

4.4

If only the upper limit (maximum content) is specified, in the guaranteed value of a certain measurement item of the feed product, the judgment shall be made, after adding the corresponding permitted tolerant value to the guaranteed value of the product.

4.5

If a lower limit value and an upper limit value are specified, in the guaranteed value of a certain measurement item of the feed product, the judgment of the lower limit value shall be carried out, according to 4.3; the judgment of the upper limit value shall be carried out, according to 4.4.

Example:

The guaranteed value of the salt content of a compound feed product is 0.3% ~ 0.8%.

Looking up Table 1, the lower limit of 0.3% and the upper limit of 0.8% of the guaranteed value of salt content are in the "0.3 ~ 1" grade of the standard specified value in the Table;

the corresponding permitted tolerant value is 0.1%.

Calculation:

The lower limit of the qualified judgment is 0.3% - 0.1% = 0.2%;

The upper limit of the qualified judgment is 0.8% + 0.1% = 0.9%.

4.6

The permitted tolerants, which are listed in this standard, are expressed in absolute error and relative error. When the permitted tolerant is expressed by relative error (such as Table 2, Table 3, Table 5), the calculation example is as follows.

Example:

The maximum limit of zinc in a piglet milk replacer product is 200 mg/kg.

Check Table 3. When the standard value of zinc content is 100 mg/kg ~ 500 mg/kg, the corresponding permitted tolerant (relative error) is 35%.

Calculation:

The upper limit of the qualified judgment is 200 + (200 × 35%) = 270 (mg/kg).

4.7

The rounding of numerical values shall be performed, in accordance with GB/T 8170. The comparison, between the test result of the product item and the guaranteed value, shall be carried out, according to the "rounding value comparison method" in

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