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OECD 120 describes a method to analyze the solution/extraction behavior of polymers in water, which uses the flask method (OECD 105) with modifications. The method is not applicable to liquid polymers and to polymers that react with water under the test conditions.
Three samples of 10 g of particles of the test substance are weighed into each of three vessels fitted with glass stoppers. 1000 ml of water is added to each vessel. The vessels are tightly stoppered and then agitated at 20 °C normally during a period of 24 hours. Then, the content of each vessel is centrifuged or filtered and the concentration of polymer in the clear aqueous phase is determined by a suitable analytical method.
▶ Test substance requirement:
➢ Non-liquid and does not react with water;
➢ Preferably with a size between 0.125 and 0.25 mm;
▶ Temperature: 20 °C;
▶ pH: 7;
▶ Reactor size: preferred at 1000 mL;
▶ Test substance dosage: 10 g;
▶ Duration: 24 hours.
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