淹水条件下土壤还原作用对镉活性消长行为的影响

被引：60

作者：

黄丹丹

葛滢

周权锁

机构：

[1] 南京农业大学资源与环境科学学院

来源：

环境科学学报 | 2009年 / 29卷 / 02期

关键词：

土壤; 还原作用; 氧化铁; 镉;

D O I：

10.13671/j.hjkxxb.2009.02.002

中图分类号：

X53 [土壤污染及其防治];

学科分类号：

083001 [环境科学];

摘要：

采用红壤(pH=4.46)和潮黄土(pH=7.10)在氮气(N2)覆盖下进行淹水恒温((25.0±0.5)℃)培养.红壤在淹水60d后pH上升到5.92,潮黄土在淹水3d后pH降至6.62,然后再上升到6.89.2种土壤的pe+pH从14.16下降到5.38.pH和pe+pH的升降导致了土壤固相交换态(Exc-)、碳酸盐结合态(Carb-)、氧化物结合态(Oxide-)、有机质结合态(Org-)Fe再分配比例的增长,并使Exc-Cd向Carb-Cd、Oxide-Cd、Org-Cd转化.土壤Exc-Cd与Exc-Fe之间,Exc-Cd与(Carb-Cd+Oxide-Cd+Org-Cd)、(Carb-Fe+Oxide-Fe+Org-Fe)之间均显著负相关,由此表明,Fe组分的再分配决定着Cd组分的再分配.Fe、Cd的形态分配还影响着液相中Fe、Cd的浓度.在红壤淹水的1～7d中,固相中Cd以Exc-Cd为主,液相中Cd的浓度随pe+pH的下降而增加;在红壤淹水的中后期及潮黄土的整个淹水期,固相中Cd以Carb-Cd和Oxide-Cd为主,液相中Cd的浓度随pe+pH的下降而下降.淹水土壤中DOM对水溶性Cd浓度的影响不显著.

引用

页码：373 / 380

页数：8

共 20 条

[1]

Transformations in solid phase species of metals as affected by flooding and organic matter [J].

Kashem, MA ;

Singh, BR .

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 2004, 35 (9-10) :1435-1456

[2]

Metal partitioning in a sulfidic canal sediment: metal solubility as a function of pH combined with EDTA extraction in anoxic conditions.[J].A Maes;M Vanthuyne;P Cauwenberg;B Engels.Science of the Total Environment.2003, 1

[3]

Metal speciation (Cu, Zn, Pb, Cd) and organic matter in oxic to suboxic salt marsh sediments, Severn Estuary, southwest Britain [J].

Mortimer, RJG ;

Rae, JE .

MARINE POLLUTION BULLETIN, 2000, 40 (05) :377-386

[4]

Redox stratification and heavy metal partitioning in Avicennia -dominated mangrove sediments: a geochemical model.[J].Malcolm W. Clark;D. McConchie;D.W. Lewis;P. Saenger.Chemical Geology.1998, 3

[5]

Environmental contamination and seasonal variation of metals in soils; plants and waters in the paddy fields around a PbZn mine in Korea.[J].Myung Chae Jung;Iain Thornton.Science of the Total Environment.1997, 2

[6]

The role of pyrite in controlling metal ion activities in highly reduced soils [J].

Brennan, EW ;

Lindsay, WL .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (19) :3609-3618

[7]

Solubility of heavy metals in a contaminated soil: Effects of redox potential and pH.[J].M. C. Chuan;G. Y. Shu;J. C. Liu.Water; Air; and Soil Pollution.1996, 3

[8]

贵溪市污灌水田重金属元素的化学形态分布 [J].