Determining the influence of the physicochemical parameters of urban soils on As availability using chemometric methods: A preliminary study
Christophe Waterlot
,
Aurélie Pelfrêne
,
Francis Douay
DOI:10.1016/j.jes.2015.12.028
Received August 21, 2015,Revised November 12, 2015, Accepted December 25, 2015, Available online March 18, 2016
Volume 28,2016,Pages 183-192
An initial exploration was conducted using mathematical and statistical methods to obtain relevant information about the determination of the physicochemical parameters capable of controlling As uptake by ryegrass grown on contaminated topsoils. Concentrations of As in the soils were from 10 to 47 mg/kg, mainly in the As(V) form (57%–73%). Concentrations of As in water extracts were very low (61–700 μg/kg). It was suggested that As(III) was mainly in the uncharged species and As(V) in the charged species. Chemometric methods revealed that the values of the ratio As(III)/As(V) depended on the assimilated-phosphorus, the pseudo-total and water-extractable Fe contents and the soil pH. Arsenic concentrations measured in ryegrass shoots ranged from 119 to 1602 μg/kg. Positive linear correlations were obtained between As in ryegrass shoots and water extractable-As. The transfer coefficient of As correlated well with the ratio assimilated-phosphorus/Fe-oxides. As(III) uptake by the shoot of ryegrass was controlled by the organic matter and Fe-oxide contents.
