R-F values of 10 carboxylic acid herbicides on different stationary phase in 19 different mobile phases are studied. A relationship between stationary phase, mobile phase and herbicides structure and R-M values of the solutes is tried. The best results are found with 3 prototypical herbicides for 7 other herbicides on 8 to 19 phases and with 5 prototypical phases for 6 herbicides with 14 other phases. Both correlation results are not very good.