ISSUE FOCUS FEED & ADDITIVE MAGAZINE May 2025 45 of product that will be sampled, a minimum number of incremental samples should be collected in order to obtain a representative sample for analysis. Figure 1 illustrates the basic steps for a successful sampling procedure. SAMPLE SELECTION Every individual item in the lot should have an equal chance of being selected: This is a method called random sampling. It is essential to select equipment that is adequate for sampling. For example, probes should be able to sample large particles and reach every location in the lot. If the lot has been blended thoroughly during handling, then it is assumed that all particles are distributed uniformly and representative samples may be collected. However, when particles are not distributed uniformly, the aggregate sample should be an accumulation of several small incremental samples taken from many different locations throughout the lot. In general, sampling is best achieved when the lot is in motion. EXTRACTING SAMPLES DURING TRANSFER In the context of mycotoxin analysis, the reliability of results significantly relies on meticulous sampling techniques, especially during the critical phase of product transfer. This section delves into the intricacies of sampling during transfer, addressing scenarios involving both loading buckets and loading spouts. SAMPLING FROM A MOVING STREAM (LOADING BUCKET) Efficiently collecting incremental samples of products, each weighing 100 g, during the transfer is crucial for obtaining a representative analysis. This process involves taking samples at periodic intervals throughout the transfer, allowing for a comprehensive understanding of mycotoxin distribution within the product flow. When utilizing a loading bucket, precision is vital. Scoop samples must be carefully extracted from the grain within each loaded bucket. An optimal spot for sample collection is identified to ensure a strategic approach in capturing a cross-section of the product. SAMPLING FROM A MOVING STREAM (LOADING SPOUT) In scenarios involving a loading spout, the sampling methodology adapts to the dynamic nature of the transfer. Automatic sampling can be achieved us- • Collect an adequate number of incremental samples (100g) according to lot weight. • Mix incremental samples thoroughly to form the aggregate sample (no less than 1kg) • Prepare the laboratory sample: Collect scoops from different points in the aggregate (e.g. five 200 g samples for an aggregate of 1kg) • Place into an adequate container, label samples properly and store accordingly • Send samples to laboratory for analysis Figure 1. The basic steps for a successful sampling procedure
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