Portal de Periódicos da CAPES

Influence of solid/liquid ratio on the experimental frror of sorption coefficients in pesticide/soil systems

1990; Wiley; Volume: 30; Issue: 1 Linguagem: Inglês

10.1002/ps.2780300105

1096-9063

J.J.T.I. Boesten,

Soil Carbon and Nitrogen Dynamics

Abstract The influence of the solid/liquid ratio on the experimental error in the sorption coefficient in pesticide/soil systems was assessed by theoretical analysis. It was assumed that the sorption coefficient is derived from the measured decrease in concentration in the liquid phase of a soil suspension. A first analysis based on systematic errors in the concentration in the liquid phase showed that the relative error in the sorption coefficient is controlled by the product of the solid/liquid ratio and the sorption coefficient (a dimensionless quantity). If this quantity tends to zero, the relative error tends to infinity. A second analysis, based on random errors in the concentration in the liquid phase, gave a similar result. To minimize experimental errors the solid/liquid ratio should be taken as large as possible unless the equilibrium concentration becomes too low to be measured accurately.