落叶松单宁净化有毒金属离子的研究

Study on Removal of Toxic Metal Ions by Larix Tannin

经研究,发现落叶松单宁能有效去除水中的Cu^(2+)、Fe^(2+)、Zn^(2+)等有毒金属离子,影响络合反应的因素主要有3个:落叶松单宁的用量、静置时间与反应体系的pH值,其中单宁用量对溶液残余浓度有显著影响。通过实验还确定了落叶松单宁与Cu^(2+)、Fe^(2+)、Zn^(2+)反应的最佳条件,去除率可达到65％～90％。

The authors of this article find out that Larix tannin can effectively eliminate toxic metal ions in water by chelation, and main factors affecting chelation reaction are quantity of Larix tannin added, time of quiescent settling and pH value of reaction system, in which the quantity has remarkble effect. Also, the best conditions of the tannin chelating with Cu2+ ,Fe2+ ,Zn2+ are ascertained through orthogonality experiments, and percentage of removal of the ions can reach 65% -90% .