Inverse-variance weighted regression with uncertainty in both variables for the quantitative description of traffic-emitted lead transfer into plants

A comprehensive screening study of traffic emitted lead pollution of soil a nd plants was carried out. In a first step of data evaluation the influence of the factors traffic density and distance from the road was excluded to describe the bivariate relationship between plant lead and soil lead conten ts. Then the application of inverse-variance weighted regression which take s into account the considerable uncertainty of the data obtained enabled th e quantitative determination of the soil-plant lead transfer.