Sample : 100micro-L
1. 1-Hydroxyethylidene-1,1-diphosphonate, HEDP
2. Nitrilotris(methylene phosphonate), NTMP
3. N,N,N’,N’-Ethylenediaminetetrakis(methylene phosphonate), EDTMP
4. N,N,N’,N’-Ethylenediaminetetrakis(methylene phosphonate), EDTMP
Column : Shodex IC NI-424 (4.6mmID*100mm) Eluent : 3mM H2SO4 aq. Flow rate : 1.0mL/min Detector : Shodex RI Column temp. : 40°C