Properties Evaluation of Natural Sea Water for Biodegradation Test According to ASTM D6691
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Abstract
The evaluation of the properties of natural seawater for a biodegradation test in accordance with ASTM D6691 was performed by utilizing seawater from the eastern coast of Thailand, specifically Chonburi Province (CB) and Rayong Province (RY). Samples were collected three times throughout the year: in November 2021, March, and July 2022. The results indicated that, over the study period, the average biodegradation percentages of the positive reference substance (cellulose chromatography grade) in both seawater samples ranged from 72.90% to 94.33% within the 28-day test period. This range aligns with the criteria outlined in ASTM D6691, which specifies that the biodegradation value of the positive reference substance must exceed 70% within the 10 to 90 days period. In conclusion, both sources of natural seawater exhibit properties suitable for assessing biodegradation according to ASTM D6691. For the upcoming study, the collection area for seawater will be expanded to validate the test method and provide evidence of its accuracy and reliability in the biodegradation testing of plastics in seawater.
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