BS EN 16087-1:2020 pdf free.Soil improvers and growing media一 Determination of the aerobic biological activity.Oxygen uptake rate (OUR).
BS EN 16087-1 1 Scope This document describes a method to determine the aerobic biological activity of growing media and soil improvers or constituents thereof by measuring the oxygen uptake rate (OUR). The oxygen uptake rate is an indicator of the extent to which biodegradable organic matter is being broken down within a specified time period. The method is not suitable for material with a content of particle sizes > 10 mm exceeding 20 %.  2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 13039 Soil improvers and growing media – Determination of organic matter content and ash EN 13040 Soil improvers and growing media一Sample preparation for chemical and physical tests, determination of dry matter content, moisture content and laboratory compacted bulk density EN 45501, Metrological aspects of non-automatic weighing instruments EN ISO 3696, Water for analytical laboratory use – Specification and test methods (ISO 3696)Fill the CO2-absorbent containing unit (see 5.3) with the absorbent (see 6.7). The pellets can be used several times. Before every use, they shall be inspected for colour changes. If the colour has changed, they shall be replaced. Replace the bottle top sensor and ensure a gas-tight fit. Start the shaking table (120士20) rpm or magnetic stirrer (between 180 rpm and 450 rpm) and measure the pressure over seven days. Record the pressure 2 to 4 times per hour over seven days with the connected pressure transducer (see 5.2). The measurement ends, in principle, after seven days but can be ended if the pressure difference between the maximum and minimum value is more than 10 kPa. NOTE If a magnetic stirrer is used and the amount of sand and gravel in the sample is high, it is important to check that the stirrer is not in contact with the base. To check the tightness of the measurement system, it is necessary to include a blank measurement without sample material, but all necessary solutions. BS EN 16087-1 pdf download.