BS 5551-2.7:1988

This standard BS 5551-2.7:1988 Fertilizers. Sampling is classified in these ICS categories:

• 65.080 Fertilizers

When sampling is carried out on a batch of fertilizer, an increment is taken from N units. Each of these increments may be taken either by means of partial sampling devices, if their validity (absence of any particular bias) is assured, or by treating the complete item with a suitable reduction device (absence of bias).

This British Standard specifies, for the latter case, the extent of mass reduction beyond which the error in the representativity of the increment can no longer be ignored. It may also be used to establish the minimum mass of any intermediate increment during the treatment of the sample, up to analysis. Where partial sampling devices are used, this limiting mass can be much more important.

Contains some of the theoretical background to the derivation of formulae for calculating the minimum mass of an increment and gives examples of values in tables.