To clarify the distribution and estimate the background concentration of arsenic (As) is significant to the prevention and
control of soil As contamination. Taking Jiangxi as study area, demonstrating the distribution of As in cultivation and
parent materials layers, and estimating the soil background concentrations of As by five approaches, which are
Geometric mean and geometric standard (GM+2GSD), Iterative 2-σ technique, Upper confidence limit (UCL0.95),
Accumulative frequency method and Deep layer soil element method. The results indicate that the content of As in
cultivation layer is 15.2 mg kg-1, and the spatial variation of As in cultivation layer higher than the parent materials layer.
The result of Iterative 2-σ technique is highest among the five methods, which is 23.0 mg kg-1, and other four methods’
results are highly consistent. The estimation results of GM+2GSD is accepted as the soil background concentration of As
in study area. This method is easy calculation and can be applied to estimating the regional soil background
concentrations of trace elements.