Relation of reactive solute-transport parameters to basic soil properties

Authors : Md Abdul MOJİD, Abm Zahid HOSSAİN, Guido C L WYSEURE

Pages : 326-336

Doi:10.18393/ejss.454512

View : 41 | Download : 13

Publication Date : 2018-10-01

Article Type : Research Paper

Abstract :Solute-transport parameters are needed to assess the pollution risks of soil and groundwater resources. A reliable estimate of these parameters from easily measurable soil properties is therefore important. So, the correlations of the transport parameters for one metalloid compound insert ignore into journalissuearticles values(NaAsO 2 );, six heavy metal compounds insert ignore into journalissuearticles values(Cdinsert ignore into journalissuearticles values(NO 3 ); 2 , Pbinsert ignore into journalissuearticles values(NO 3 ); 2 , Niinsert ignore into journalissuearticles values(NO 3 ); 2 , ZnCl 2 , CuSO 4 and Coinsert ignore into journalissuearticles values(NO 3 ); 2 );, two pesticides insert ignore into journalissuearticles values(cartap and carbendazim); and one inert salt insert ignore into journalissuearticles values(CaCl 2 ); with some basic properties of eight agricultural soils of Bangladesh were investigated. The purpose of this study was to generate information for development of non-parametric pedo-transfer functions for reactive solute transport through soils. The transport experiments with the solutes were done in repacked soil columns under unsaturated steady-state water flow conditions. The major solute-transport parameters – velocity of transport insert ignore into journalissuearticles values( V );, dispersion coefficient insert ignore into journalissuearticles values( D );, dispersivity insert ignore into journalissuearticles values( l );, retardation factor insert ignore into journalissuearticles values( R ); and Peclet number insert ignore into journalissuearticles values( P ); – were determined by analysing solute breakthrough curves insert ignore into journalissuearticles values(BTCs);. The basic soil properties pertinent to solute transport: clay content, median grain diameter insert ignore into journalissuearticles values(D 50 );, pore-size distribution index insert ignore into journalissuearticles values( n );, bulk density insert ignore into journalissuearticles values( r );, organic carbon content insert ignore into journalissuearticles values(C); and pH were determined. The associations of the solute-transport parameters with these soil properties were investigated and evaluated. Both the solute dispersivity and retardation factor increased significantly insert ignore into journalissuearticles values(p<0.05); insert ignore into journalissuearticles values( l linearly and R following power law); with the increase in soil clay content. Dispersivity significantly decreased with the increase in median grain diameter following power law. The V , D , l and P values were weakly and negatively correlated with the soil bulk density. Retardation factor, R , was moderately and positively correlated with the ratio of clay content to organic carbon content. Dispersivity decreased but P increased, both significantly, with increasing pore-size distribution index, n . V , D and P were positively correlated with soil pH, while R and l were negatively correlated with it. The correlation of the solute-transport parameters with soil properties being significant insert ignore into journalissuearticles values(p < 0.05);, in most cases, provides strong possibility of predicting solute-transport parameters from the basic soil properties through the development of pedo-transfer functions.
Keywords : Reactive solutes, transport parameters, soil pH, pore size distribution

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