BS/EN 14984-2016 pdf download.Liming materials Determination of product effect on soil pH – Soil incubation method.
5.1 Reagents and materials
5.1.1 Reference soil,
with the following characteristics:
a) pH 5,6 to p11 6,4 in water, when determined in settling suspension after 16 h in accordance with Iso 10390:2005, 7.1.3, 7.2 and 7.3;
b) cation exchange capacity of 9 cmol+/kg to 11 cmol+/kg. when determined in accordance with NF X 3 1-130 (see footnote in Clause 2);
c) mass fraction of organic carbon (OC)of 0,50 % to 2,00 % on a dry basis, when determined in accordance with ISO 14235 (this is equivalent to 0,86 % to 3,44 % expressed as organic matter, (OM)(OM =OCx 1,72));
d) mass fraction of particles of equivalent spherical diameter less than 0,002 mm (clay) shall be less
than 20 %, when determined in accordance with ISO 11277.
5.1.2 Reference liming material (RLM),
calcium hydroxide of recognized analytical grade.
5.1.3 Water,
conforming to EN ISO 3696, grade 3.
5.2 Apparatus
5.2.1 Temperature-controlled room,
capable of being maintained at (20 ± 2) °C
5.2.2 pH meter,
capable of being read to the nearest 0,01 unit.
5.2.3 Beakers,
capacity 200 ml.
5.2.4 Pots,
of inert material with respect to soil. 50 mm to 200 mm diameter, capacity according to Table 1.
5.2.9 Test sieves,
wire sieves, 1 mm, 2 mm, 4 mm and 6,3 mm nominal aperture size, according to ISO 3310-1.
5.3 Sampling of products and sample preparation
Take a sample in accordance with EN 1482-1 or EN 1482-3.
Determine the dry matter content of the sample in accordance with EN 12048 or EN 12049.
Determine the dry matter content of the soil in accordance with ISO 11465. It shall be used to adjust the mass fraction of soil in Table ito determine field water capacity in 5.4.3.
Determine the smallest aperture size sieve from the range 1 mm, 2 mm, 4 mm and 6,3 mm that all the sample will pass.
For mineral products use the sample as received.
For organic products use the sample as received, but after homogenization, unless it contains coarse particles (equivalent spherical diameter greater than 1 mm). If the sample contains coarse particles, prepare it in accordance with EN 13040 so that all the particles will pass a 1-mm aperture size sieve. Determine in that case the fineness of the product.
5.4 Procedure
5.4.1 Preparation of the standard soil
Dry the soil to constant mass at a temperature below 40°C. sieve on a 2 mm aperture size sieve (5.2.9) and use the soil that passes the sieve.
Measure the initial pH of the standard soil in a settling suspension of water after 16 h in accordance with ISO 10390:2005, 7.1.3, 7.2 and 7.3 and record it.
5.4.2 Test portions
Weigh, to the nearest 0,00 1 g. two test portions each of the mass specifIed in Table 1. At the same time, weigh, to the nearest 0,00 1 g. two portions of reference liming material (4.1) of the same mass as the test portions.
NOTE The portion of reference liming material is equivalent to 2 250 units of neutralizing value per hectare, on the basis of 3 000 t of dried soil per hectare, and in the standard soil It will raise the pH by approximately one unit.
150 mm. Add a test portion to each of two pots (pots A1 and A2). Add a portion of reference liming material (5.1.2) to each of two further pots (pots B1 and B2), and possibly more pots and leave the remaining two pots (pots C1 and C2) with just the standard soil. Thoroughly mix the contents within each pot. Onto the soil in each pot, slowly add, by means of a drip, a mass of water (5.1.3) corresponding to 70 % of the water field capacity (see Annex B) considered at free drainage. Weigh each pot and its contents and record the masses.
5.4.4 Incubation
Maintain the open pots at a constant temperature of (20 ± 2) °C in the temperature-controlled room
(5.2.1).
Regularly check the water losses in the pots by weighing and adjust using a drip as often as necessary. The water contents shall not fall below to 60 % of the water field capacity. Thoroughly mix the contents of each pot before watering to avoid soil compaction.
5.4.5 pH measurements
Measure the pH after incubations of 24 h, 2 weeks and 4 weeks.
Thoroughly mix the contents of each pot. Take three portions, each of 20 ml, from each pot, thoroughly mixing the contents after taking each portion. Place each of these portions in a separate beaker (5.2.3). Continue the incubation process until the next measurement.
Add 100 ml water (5.1.3) to the contents of each beaker, measure the pH of each settling suspension in accordance with ISO 10390:2005, 7.1.3, 7.2 and 7.3, but perform the measurement of the pH after 16 h of settling in order to completely externalize the neutralization effect of the tested product and record each result (see Table 2).
5.5 Expression of results
For each set of six results from a pair of pots (i.e. pot A1 and pot A2, pot B1 and pot B2 and pot C1 and pot Cz). after each time interval, calculate the mean values of the pH and the deviation and report them in Table 2.BS/EN 14984-2016 pdf download.