ISO 14820-3 Fertilizers and liming materials — Sampling and sample preparation — Part 3: Sampling of static heaps

ISO 14820-3:2020 extends the sampling series to static heaps. Published on 1 November 2020, it fills a gap that existed from the outset: Parts 1 and 2 deal with packaged product, fluid products, and bulk product provided the material is in motion, which leaves a stockpile sitting in a warehouse or on a quay without a defined sampling method.

Sampling a static heap is a genuinely harder problem. A heap is typically the least homogeneous configuration a fertilizer ever takes — the result of successive pours, with coarse and fine fractions separated and segregation concentrated towards the outer surfaces and the base. A sample taken from the accessible surface will systematically misrepresent the lot.

Part 3 specifies how to construct a representative sample from such a heap: the geometry of the sampling pattern, the depth to which increments must be taken, the number of increments required relative to heap size, and the handling of heaps that cannot be safely or practically accessed in full.

The practical value is that it closes the last procedural loophole in the sampling chain. Without a defined method for heaps, a disputed consignment in storage could not be sampled to a defensible standard — which in practice meant either sampling it badly, or sampling it to a method chosen by whichever party stood to gain.