(as SiO$_{2}$): ≤50 mg/kg  sulfate (SO$_{4}$ $^{2-}$):   ≤5 mg/kg  cation traces Al: ≤10 mg/kg  Ca: ≤10 mg/kg  Fe: ≤5 mg/kg  Na:  ≤5000 mg/kg  Ni: ≤5 mg/kg  Florisil Adsorbent for Chromatography 60-100 mesh,  pack. 500g  grade standard  form coarse powder  particle size 149-250 μm  60-100 mesh  surface area 289 m $^{2}$/g  3  Quartz Sand, white quartz, Suitable for chromatography,  50-70 MESH, 5 kg  color white  particle size 50-70 mesh  3  Page 48 of 76  August 2020 EN-c4f_annexiitechspeciiitechoffer_en.docx  EN-c4f_annexiitechspeciiitechoffer_en.docx