Hergestellt von XRF Scientific aus hochreinen synthetischen Verbindungen gemäß ISO 9516-1: 2003 (E) mit Zusatz von NaCl und kompensierender Abnahme von SiO2.
Die ISO-Methode 9516 enthält weder Natrium noch Chlor. Diese Elemente wurden jedoch von der Eisenerzindustrie gefordert. Das NaCl wurde vor der Zugabe bei 105ºC getrocknet.
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