The degradation function of biodegradable data and the test of the degradation function of biodegradable data have not yet formulated a uniform standard. The methods adopted or prepared by ASTM can be used as the standard method. The main methods for evaluating the degradation function of biodegradable data by biochemical and microbial test methods are as follows.
There are two kinds of burial methods: outdoor burial method and indoor burial method. Their microbial sources are mainly microbial groups in the soil. After a certain time, the samples are taken out to determine their weight loss, mechanical function changes, or to determine their invasion by microorganisms in the soil by electronic microscopy.
The advantage is that it can reflect the biological differentiation function under natural environment conditions, while the disadvantage is that the test cycle is long, the test results vary with soil quality, and the repeatability is poor. Quantitative method of Vettel incubator participates in the test sample and nutrient agar in the container, inoculates microorganisms for cultivation, after a certain time, analyses the weight loss of the sample and some physical or chemical changes.
The advantages are fast degradation, good repeatability and good quantification. The disadvantage is that it can not reflect the actual situation in nature. Enzyme dissection is used to participate in buffer solution and test sample in container. When the effect of enzyme is certain, the weight loss of sample is analyzed, the growth of mould is visualized, and the changes of physical or chemical functions of sample are analyzed under microscope.
The advantages are short test cycle, good repeatability and good quantification, while the disadvantages are that it can not reflect the actual situation in nature. Radioactive C14 tracer uses C14 to label polymer products. CO2 occurs under the effect of microorganism and is absorbed by alkaline solution.
The total amount of CO2 was measured by titration, and then the amount of CO2 in C14 was measured by radioactivity attenuation rate. The percentage of CO2 in C14 was used to indicate the degree of microbial erosion. The advantage is that the test results are credible and clear. The test of biodegradability can test the biodegradability of samples.
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