EN ISO 19679:2020 pdf download.Plastics – Determination of aerobic biodegradation of non-floating plastic materials in a seawater/sediment interface – Method by analysis of evolved carbon dioxide (ISO 19679:2020). 6.3 Natural seawater/sedlnsent Take a sample cif a sandy sediment and seawater with a shovel beneath the low.watrr line into a buckeL Transfer the wet sediment together with seawater Into seiled containers br transport and fast deliver It to the bhoratory. Alter di’hvery. ci,nsin-vr the sediment at low temperature (approximately 4 C) until use, The seawaterfsediment sample should he preferably used within 4 weeks alter sampling. Record storage time and conditions. NOTE Seawater aiwl sediment can .ilw be sampled from large. wrhl.ninnlng public marine aqwarta Measure the TOC. pH and nitrogen content or the sediment and 01 the natural seawater if used instead 01 artifIcial seawater. The carbon content of sediment should be in the range of 0,1 % to 2%. A preliminary oxidation can be applied to the sediment in order to decrease the organic matter content and the background respiration. Sediment and seawater are fluxed with air and gently stirred (max. 20 c/mm to 30 r/mln) In a large container br the desired period of time. Include this pretreatment process in the test report. 7 Apparatus 7.1 Test flasks Biometer flicks of the volume of about 150 ml are appropriate. Reactors with higher volumes can be used, Ii test conditions are not affected. The vessels shall be located In a constanl.temperature room or In a thermostatic apparatus (e.g. water’bath). Stirring can be applied on seawater oii condition that it does not disturb the sediment/seawater Interface. NOTE A suitable apparatus is shown us Figure kI. An example of a stirred apparatus Is given is OECDT( 308. 2002. Aismex 412L 7.2 ContaIner for the CO2 absorber. A glass beaker to be located in the headspace of the reactor and filled with 10 ml of Ba(OH)2 O.012S mol/l or with 3 ml of KOhl 0.5 molfL 7.3 AnalytIcal balance, shall have a aensluvity olat least 0.1 mg. 7.4 pH meter 8 Procedure 8.1 Test material The test material should be in film or sheet form. Cut samples of the test material In the shape of a disk Disks shall have a smaller ibameter than the glass flasks, so that the disks can be easily laid on the bottom or the glass flask The sample shall be of known mass and contain sufficient carbon...
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