来源网址：http://www.rsoau.com 2019-01-29 13:54:03
The degrading function of biodegradable data and the test of the degrading function of biodegradable data have not yet formulated a consistent standard.
There are several main methods to be evaluated by biochemical and microbiological methods, including those adopted or prepared by ASTM.
There are two kinds of burial methods: outdoor burial method and indoor burial method. Their microbial sources are mainly microorganisms in the soil. After a certain period of 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 decomposition function under natural environment conditions; the defect is that the experimental period is long, the experimental results vary with soil quality, and the repeatability is poor.
Quantitative method of Vettel incubator is to take part in the experiment sample and nutrient agar in the container, inoculate microorganisms for cultivation, after a certain time, analyze the weight loss of the sample and some physical or chemical changes.
The advantage is that it can be degraded quickly, and experimental results can be obtained in a short time. It has good repeatability and good quantification. The disadvantage is that it can not reflect the actual situation in nature.
Enzyme dissection method takes part in buffer solution and experimental sample in container. After the effect of enzyme is certain for a certain time, the weight loss of sample is analyzed, the growth of mould is observed visually, and the changes of physical or chemical functions of sample are analyzed under microscope.
The advantage is that the experiment cycle is short, the repeatability is good, and the quantity is good. The defect is that it can not reflect the actual situation in nature.
Radioactive C14 tracer method uses C14 symbolic polymer products to produce CO2 under the effect of microorganisms, absorbs CO2 in alkaline solution, measures total CO2 by titration, and then measures CO2 content of C14 by radioactivity attenuation rate. The percentage of CO2 in C14 is used to indicate the degree of microbial erosion.
The advantage is that the experimental results are reliable and clear. The biodegradability of samples can be tested by the biodegradability test.
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