一种新型高聚物生物可降解性评价

Evaluation on Biodegradability of a Novel Copolymer

运用生物方法研究新型阻垢剂聚天冬氨酸壳聚糖聚合物的可降解性。将聚合物用活性污泥滤液降解处理后,测其28d的TOC降解率为56.35%。其生物降解性能弱于PASP,属于可生物降解物质。研究还表明,水溶液中存在4.1×10^(-4)mol/L的Ca^(2+)、Mg^(2+)、Fe^(3+)、Zn^(2+)等金属离子时不会对聚合物的降解性产生明显影响,然而同等浓度的Cu^(2+)及Hg^(2+)等重金属离子则使聚合物的降解率显著下降。降解残余物的红外光谱结果显示聚合物的Schiff碱C=N键被切断,进一步说明该聚合物发生了降解。

The test aimed to carry out research on biodegradability of the polyaspartic acidchitosan copolymer-a new water treating chemical. After the copolymer was treated by the active sludge for several days, TOC test was done for total organic carbon of the solution. And the copolymer＇s maximum degradation rate only arrived to 56.35% for 28 d, showing that its biodegradability was poorer than that of PASP. Accordingly, it was concluded that the copolymer was only a degradable reagent. In addition, the tested result also said that degradation rates of the copolymer wasn＇t dropped by 4. 1 ×10^-4 mol/L of Ca2＋, Mg2＋, Fe3＋, Zn2＋, while was markedly decreased by the identical level of Cu2＋ and Hg2＋ in aqueous medium. Furthermore, Infrared analysis for remains of the degraded copolymer showed that C=N bond of the Schiff base was broken firstly, and then it could be inferred that the copolymer was biodegraded by microbes.