Effects of calcium peroxide on arsenic uptake by celery (Apium graveolens L.) grown in arsenic contaminated soil.
The ability of calcium peroxide (CaO(2)) to immobilize As of contaminated soil was studied using pot and field experiments. In pot experiment, CaO(2) applied at 2.5 and 5 g kg(-1) significantly increased celery shoot weight and decreased shoot As accumulation, which was ascribed to the formation of stable crystalline Fe and Al oxides bound As and the reduction of labile As fractions in the soil. The labile As fractions were pH dependent and it followed a "V" shaped profile with the change of pH. In field experiment, the dose of CaO(2) application at 750 kg ha(-1) was optimal and at which the celery was found to produce the highest biomass (63.4 Mg ha(-1)) and lowest As concentration (0.43 mg kg(-1)). CaO(2) probably has a promising potential as soil amendment to treat As contaminated soils.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Chuan-ping
CP
Liu
Chun-ling
CL
Luo
Xiang-hua
XH
Xu
Chuang-an
CA
Wu
Fang-bai
FB
Li
Gan
G
Zhang
D000077102:Apium / Q000378:metabolism*; D001151:Arsenic / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D010545:Peroxides / Q000737:chemistry* / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*
D010545:Peroxides; D012987:Soil; D012989:Soil Pollutants; C403632:calcium peroxide; D001151:Arsenic