HPLC-screening method for the determination of the adsorption-coefficient on soil — results of a ring-test

A HPLC-screening method is proposed for the determination of the adsorption-coefficient on soil satisfying the requirements of the base set in the updated chemicals notification scheme. Before adopting the HPLC-screening method a validation by means of a ring test had to be performed. The results of the ring test with 11 participating laboratories showed that the HPLC-screening method can easily be performed in any analytical laboratory producing matrix independent PC-data of high precision. The standard deviations obtained in the ring test using the screening method are smaller than deviations normally achieved with the adsorption/desorption test according to guideline No 106 using different soils.