ISO 18311:2016 pdf free
ISO 18311:2016 pdf free.Soil quality一Method for testing effects of soil contaminants on the feeding activity of soil dwelling organisms一Bait-lamina test
In the lower part (85 mm) of each bait-lamina strip 16 bi-conical apertures of 1,5 mm diameter are drilled at 5 mm intervals (see also Figure 1). These apertures are the place where the bait is filled-in.Their bi-conical form secures the stability of the bait-material inside the apertures. Different mixtures can be used as bait-material, but the following mixture is recommended: cellulose (70 %), finely ground wheat bran (25 %), and activated carbon (5 %). The latter component’s black colour facilitates the differentiation between the bait material and soil particles when assessing the feeding activity at the end of the test. It is very important to grind the bran as fine and homogenous as possible. Therefore, it is recommended to sieve the grounded bran (mesh size: 0,25 mm). By doing so, not only the homogeneity of the bait-material but also its stability in the apertures of the bait-lamina strips is improved.
The three components of the bait material shall be well mixed before water is added. The amount of water cannot be given in detail but it should be enough in order to create a paste. Bait material shall be sufficiently moist to hold together and fill the apertures of the plastic strip. Too much water can lead to cracking upon drying causing the bait to fall out of apertures. Both, too dry and too wet baits, are not stable. This work shall be performed by hand (see Figure 2). After air-drying of the strips, they shall be visually inspected. All baits which show holes, small fissures, or ruptures shall be treated with the paste of bait-material again until optically all baits are intact. The whole procedure does secure that the bait-material remains intact inside the apertures of the plastic strips, in particular when they are inserted into the soil. Prepared strips may be stored under dry conditions in plastic bags for up to six months.Before: starting a test, their integrity (no mould, holes, fissures, or ruptures in the baits) shall be checked.ISO 18311 pdf free download.
