塑料. 海水/沙沉积交界面非漂浮塑料材料好氧生物降解的测定. 测量密闭呼吸计中需氧量的方法

[中文适用范围]： 本国际标准规定了一种测试方法，用于测定塑料材料在海洋-沙滩沉积物界面处（海水与海底表面的交界处）沉降时有氧生物降解的程度和速度。该测试方法通过测量封闭式呼吸仪中的氧气需求量来实现。 该测试方法模拟了实验室条件下海洋环境中不同沉积环境（如底栖带，即阳光到达海底区域（光带区域）的环境）的好氧生物降解情况。在海洋科学中，这被称为浅海带（sublittoral zone）。 [外文原描述]： ISO 18830:2016 specifies a test method to determine the degree and rate of aerobic biodegradation of plastic materials when settled on marine sandy sediment at the interface between seawater and the seafloor, by measuring the oxygen demand in a closed respirometer. Measurement of aerobic biodegradation can also be obtained by monitoring the carbon dioxide evolution. This is not in the scope of this International Standard but of ISO 19679. This test method is a simulation under laboratory conditions of the habitat found in different seawater/sediment-areas in the sea, e.g. in a benthic zone where sunlight reaches the ocean floor (photic zone) that, in marine science, is called sublittoral zone The determination of biodegradation of plastic materials buried in marine sediment is outside the scope of this International Standard. The conditions described in this International Standard may not always correspond to the optimum conditions for the maximum degree of biodegradation to occur.