摘要
采用改进的Tessier连续萃取方法对从松花江中采集的生物膜中锰、铁、铜、铅、锌及镉的化学形态进行分析,考察了生物膜上铁、锰氧化物和有机质吸附重金属的相对作用,同时讨论了在研究培养的生物膜吸附痕量重金属时所建立的选择性萃取方法对于采集的生物膜组分分离的适用性.研究结果表明,在采集的生物膜上痕量重金属以铁、锰的氧化物为主要结合形态存在,以此种形态存在的铜、锌、铅和镉分别占其总含量的62.9%,58.3%,53.8%和32.6%,而以有机结合态存在的铜、锌、铅和镉,分别占其总含量的1.1%,0.6%,9.9%和1.8%,表明采集的生物膜上铁、锰氧化物在吸附重金属的过程中起主要的控制作用,而有机质的作用相对较小,与以往利用选择性萃取技术研究培养的生物膜吸附重金属的规律一致.进一步分析表明,如扣除生物膜上铁的残渣态部分,则选择性萃取分离技术可以有效地将采集的生物膜上的铁、锰氧化物及有机质分离开.
The chemical fractions of manganese, iron, copper, lead, zinc and cadmium in the natural surface coating samples（NSCSs）, which were collected in the Songhuajiang River, were investigated by using the modified sequential extraction procedure in order to identify the relative roles of Fe/Mn oxides and organic materials in the NSCSs in controlling heavy metals adsorption. The results show that trace metals were mostly present as solid oxides/hydroxides with 62.9%, 58.3%, 53.8% and 32.6% for Cu, Zn, Pb and Cd, and litde were bound to organic material with 1.1%, 0.6%, 9.9% and 1.8% for Cu, Zn, Pb and Cd, respectively. It indicates that Fe/Mn oxides contributed the most to trace metals adsorption with less roles of organic materials in trace metals adsorption. These percent distributions of the trace metals in the NSCSs were also in excellent agreement with those obtained through direct experiments and reported in independent investigations from the natural surface coatings（NSCs） developed in natural waters. Meanwhile, the results obtained in this paper could be confirmed through the selective extraction technique on the NSCS regardless of Fe oxides bound to residual.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期627-631,共5页
Chemical Journal of Chinese Universities
基金
国家'九七三'计划项目(批准号:2004CB3418500)
教育部高等学校博士学科点专项科研基金项目(批准号:20020183056)资助
关键词
生物膜
铁、锰氧化物
铜、锌、铅、镉
连续萃取
Natural surface coatings sample
Fe/Mn oxide
Copper, zinc, lead and cadmium
Sequential extraction
