A ready-for-use solution with Triton X-100, glycine, hydrochloric acid and chelators. It is intended for use in the rapid quantitative determination of Eu3+ and Sm3+ in time-resolved fluorometric assays. It is suitable for use in multilabel assays that require DELFIA® Enhancer (prod.no. C500-100) for development of Tb3+ and Dy3+ fluorescence. The solution dissociates lanthanide from solid phase bound DELFIA® chelate labeled biomolecules in a few minutes depending from used chelate to form a homogeneous and highly fluorescent Eu/Sm-(BFPP)3(TOPO)2-3 micellar chelate solution. The solution allows highly sensitive Eu3+/Sm3+ measurements to be performed when using a time-resolved fluorometer.