US 11,789,005 B2
Device and method for determining degradation rate of biodegradable polymers in soil
Yaqing Liu, Taiyuan (CN); Taian Chen, Taiyuan (CN); Yang Xiang, Taiyuan (CN); and Guizhe Zhao, Taiyuan (CN)
Assigned to NORTH UNIVERSITY OF CHINA, Taiyuan (CN); and SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO., LTD., Taiyuan (CN)
Filed by NORTH UNIVERSITY OF CHINA, Taiyuan (CN); and SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO., LTD., Taiyuan (CN)
Filed on Jan. 22, 2022, as Appl. No. 17/581,918.
Claims priority of application No. 202111395924.2 (CN), filed on Nov. 23, 2021.
Prior Publication US 2022/0146489 A1, May 12, 2022
Int. Cl. G01N 33/44 (2006.01); G01N 1/24 (2006.01); G01N 1/38 (2006.01); C12M 1/00 (2006.01); C12M 1/02 (2006.01); C12M 1/12 (2006.01); C12M 1/04 (2006.01)
CPC G01N 33/442 (2013.01) [C12M 1/00 (2013.01); C12M 1/02 (2013.01); C12M 1/04 (2013.01); C12M 1/12 (2013.01); G01N 1/24 (2013.01); G01N 1/38 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A device for determining a degradation rate of a biodegradable polymer in soil, comprising:
a micro compressed air pump;
a first CO2 absorption vessel;
a CO2 indicator vessel;
a hollow leaching device;
a second CO2 absorption vessel; a third CO2 absorption vessel;
an external water distributor;
a mechanical stirring device; and
a leachate collecting container;
wherein the micro compressed air pump, the first CO2 absorption vessel, the CO2 indicator vessel, the hollow leaching device, the second CO2 absorption vessel, and the third CO2 absorption vessel are connected in sequence through a connecting pipe; a top of the hollow leaching device is provided with an end cover; the external water distributor and the mechanical stirring device are arranged above the end cover; the external water distributor is in communication with an inner cavity of the hollow leaching device through a connecting pipeline; a stirring shaft of the mechanical stirring device extends into the inner cavity of the hollow leaching device; the stirring shaft in the hollow leaching device is provided with a stirring paddle; the first CO2 absorption vessel is filled with dry soda lime or a first aqueous strong alkali solution; the CO2 indicator vessel contains a barium hydroxide solution; the external water distributor contains a leaching solution with a preset pH value; an upper part of the inner cavity of the hollow leaching device is filled with a certain mass of soil as a leaching zone; a bottom of the inner cavity of the hollow leaching device has an inverted cone shape and is filled with quartz sand particles as a filter zone; a bottom of the filter zone is provided with a water outlet; a lower part of the water outlet is provided with the leachate collecting container; each of the second CO2 absorption vessel and the third CO2 absorption vessel is filled with a second aqueous strong alkali solution; and an air outlet of a connecting pipe between the CO2 indicator vessel and the hollow leaching device is arranged above a liquid level in the hollow leaching device.