Effect of CaCO3 on Arsenic Validity in Calcareous Cinnamon Soil-maize System Contaminated By Arsenic
CHANG Huiqing
ZHOU Rui
SONG Panpan
GAO Qiliang
JIAO Changfeng
Abstract：In order to clarify the effect of calcium carbonate(CaCO3)on arsenic validity in calcareous cinnamon soil,the effect of 5％(mass fraction)CaCO3 on the main physicochemical parameters,arsenic morphological characteristics and arsenic uptake of maize in calcareous lignite soil were studied by setting exogenous arsenic pollution with mass ratios of 0 mg·kg-1,50 mg·kg-1,100 mg·kg-1 and 200 mg·kg-1.The results show that under the same exogenous arsenic mass ratio,CaCO3 addition significantly increases soil pH value by 2.14％～3.09％,and soil organic matter mass ratio decreases by 9％～19％.With the increase of exogenous arsenic mass ratio,the soil pH value gradually increases,and the organic matter mass ratio decreases first and then increases.The proportions of soil exchangeable arsenic(Ae-As)and calcium-bound arsenic(Ca-As)increase significantly after the addition of CaCO3,and the proportion of Ca-As is the largest.The arsenic mass ratio of each part of maize increases with the increase of exogenous arsenic mass ratio,and the results are roots＞leaves＞stems＞grains.The addition of CaCO3 increases the As mass ratio in roots,leaves,stems and grains of maize.The arsenic mass ratio in roots increases by 15.0％～28.9％,and the arsenic mass ratio in grains increases by 3.35％～6.98％among them,and the As mass ratio in the grains of each treatment does not exceed 0.5 mg·kg-1.The addition of 5％CaCO3 will activate arsenic in calcareous cinnamon soil,but corn planting can still be safely produced,so it is recommended to plant corn on arsenic-contaminated calcareous cinnamon soil.
Keywords：calcareous cinnamon soilarsenic contaminationCaCO3corn
Publication Date：2024-10-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 79-85,92 )