A continuous flotation method for microplastics in different states of occurrence in sediments
A technology of occurrence state and sediment, which is applied in the field of soil pollutant analysis, can solve the problems of inability to distinguish whether microplastics have been agglomerated with soil, inability to know the source of microplastics, inability to analyze the impact of microplastics on the environment and ecology, and Research and other issues
Active Publication Date: 2020-10-27
北京群动力科技服务有限责任公司
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Problems solved by technology
[0004] Since the first step of the existing flotation method is to use H 2 o 2 Therefore, while the organic impurities in the sediment are digested, the soil aggregates are also destroyed, so that the microplastics that form agglomerates with the soil are mixed with the microplastics in the non-soil aggregates in the first step, and the finally detected Microplastics are the total number of microplastics in secondary sediments, that is, the sum of microplastics that form aggregates with soil and microplastics that are not aggregated. It is impossible to distinguish whether microplastics have aggregated with soil, and what kind of occurrence it is before detection. status etc.
[0005] Similarly, because soil aggregates and non-aggregates in sediments have different ecological contributions and environmental impacts, if the existing flotation separation method is used, it is impossible to know the source of the obtained microplastics. Whether it has been aggregated with the soil, and it is impossible to make further analysis and research on the impact of microplastics in aggregates and microplastics in non-aggregates on the environment and ecology
Method used
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Embodiment 1
[0049] Taking the sediments in Yuzhouping mangrove forest as the research object, the continuous flotation extraction of microplastics in the sediments was carried out according to the following method:
[0050] 1. Weigh the wet sediment, air-dry naturally until there is no water dripping out, then transfer the sediment to a 2.5L suction filter bottle, add 1L of potassium formate solution with a density of 1.45g / mL or more, and shake well Sediments), after shaking well, add potassium formate solution to the place close to the mouth of the bottle, and let it settle overnight;
[0051] 2. After settling overnight, rinse the outer wall of the suction filter bottle, then place the suction filter bottle in a larger stainless steel container, first remove the larger debris and foam floating on the liquid surface with a medicine spoon, and then use silica gel Slowly add potassium formate solution into the filter bottle from the side port of the tube, so that the remaining substances ...
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The invention provides a continuous flotation method for micro-plastics with different occurrence states in sediments. The method comprises the following steps that (a) flotation is carried out on thesediments without digesting so as to obtain the micro-plastics which are not agglomerated with soil; and (b) after gravity flotation is carried out, and a system is digested, flotation is carried outagain to obtain the micro-plastics which are agglomerated with the soil. By adopting the method, the total content of the micro-plastics in the sediments can be obtained, meanwhile, the occurrence states of the micro-plastics in the sediments can be distinguished, then further research is facilitated, and the new field of micro-plastic research is developed.
Description
technical field [0001] The invention relates to the field of soil pollutant analysis, in particular to a continuous flotation method for microplastics in different states of occurrence in sediments. Background technique [0002] Microplastics are plastic fragments, particles, and fiber films with a diameter less than 5mm. It has been confirmed that a large number of microplastics exist in marine water bodies and sediments, and even in ecosystems such as rivers, lakes, and sea estuaries. Due to the wide distribution, large quantity, strong toxicity and carrier of pollutants in the world, microplastics can even be ingested by organisms and eventually affect human health through the food chain, so they have attracted the attention of the scientific community and become a research hotspot for researchers. [0003] The existing flotation separation and analysis methods for microplastics mainly include the following steps: drying the sediment to constant weight→H 2 o 2 Digested ...
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IPC IPC(8): B03D1/02
CPCB03D1/02
Inventor 张琳琳李锐龙王英辉吴怡桦卢秋杏陆贺平王伟杰
Owner 北京群动力科技服务有限责任公司