Szczawian disodu, drugorzędowy materiał referencyjny (wzorzec wtórny) do miareczkowania, w odniesieniu do SRM z NIST – SCHARLAU
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PRODUCENT: SCHARLAB
di-Sodium oxalate, secondary standard
– Synonyms: Oxalic acid sodium salt, Soerensen’s buffer substances
– Na2C2O4
– M = 134,01 g/mol
– CAS [62-76-0]
– EINECS-No.: 200-550-3
– Solub. in water: (20 ºC): 37 g/l
– Melting point: 250 – 270 ºC (decomposes)
– LD 50 (oral, rat): 7500 mg/kg (oxalic acid)
– EC-Index-No.: 607-007-00-3
– GHS-signal word: Warning
– GHS-H sentences: H302 – H312
– GHS-P sentences: P280 – P264 – P270 – P322 – P363 – P501a
– Tariff number: 2917 11 00 99
– Applications: analytical chemistry, reference material.
– Appearance: White solid
SPECIFICATIONS
assay (on dried sample): min. 99,7 %
insoluble in water: max. 0,005 %
neutrality: passes test
chlorides (Cl): max. 0,002 %
sulfates (SO4): max. 0,002 %
ammonium (NH4): max. 0,002 %
heavy metals (as Pb): max. 0,002 %
iron (Fe): max. 0,001 %
potassium (K): max. 0,005 %
substances darkened by H2SO4: passes test
loss on drying : max. 0,01 %
This standard solution is traceable to Standard Reference Material from NIST.
