Reference Material Potassium permanganate

Reference material Potassium permanganate, titre adjustment against di-Sodium oxalate 71804 (BAM/EMPA reference material, traceable to NIST SRM)

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38002 Ammonium iron(II) sulfate concentrate for 1L standard solution, 0.06 M (NH4)2Fe(SO4)2, for COD determination
38047 Iron(II) sulfate concentrate for 1L standard solution, 0.1 M FeSO4