CAJ | 학술논문

以人工配制的Zn污染土为试验对象,研究了超声波辅助EDTA清洗对土中Zn的去除效果,并利用改进的BCR法测定了处理后土中Zn的形态分布. 试验结果表明:超声波单独清洗对土中Zn的去除率很低(<1%) ,而EDTA单独清洗的去除率能够达到64%,但清洗时间在2 h以上. 超声波辅助EDTA清洗时,可以显著提高去除效果,并且缩短反应时间. 超声波促进EDTA去除的机理可以归结为:超声波可以促进稳定态的Zn (可氧化态和残渣态) 向不稳定态 (弱酸提取态和可还原态) 转化,从而使更多的Zn能够被EDTA所络合而去除.
이인공배제적Zn오염토위시험대상,연구료초성파보조EDTA청세대토중Zn적거제효과,병이용개진적BCR법측정료처리후토중Zn적형태분포. 시험결과표명:초성파단독청세대토중Zn적거제솔흔저(<1%) ,이EDTA단독청세적거제솔능구체도64%,단청세시간재2 h이상. 초성파보조EDTA청세시,가이현저제고거제효과,병차축단반응시간. 초성파촉진EDTA거제적궤리가이귀결위:초성파가이촉진은정태적Zn (가양화태화잔사태) 향불은정태 (약산제취태화가환원태) 전화,종이사경다적Zn능구피EDTA소락합이거제.
Taking the artificially prepared Zn conta minated soil as test object , the article analyzes the removal effi-ciency of Zn after ultrasound assisted EDTA washing and tests the distribution of Zn after the treatment with modified BCR method .The experimental results show that the removal efficiency of Zn with ultrasound washing alone is very low (<1%) while the EDTA washing alone can achieve the removal efficiency of 64%,but the latter's washing time is over 2 hours.With the assistance of ultrasound ,the removal efficiency of Zn is enhanced notably and the washing time is sharply shortened .The mechanism can be concluded that ultrasound can promote the conversions of Zn from stable fractions ( residual fraction and oxidable fraction ) to unstable fractions ( acid extractable fraction and reducible fraction),and then more Zn is removed by EDTA's complexation.