China Invar Metal Suppliers – Certified Reference Material – Shandong Institute of Metallurgical Science

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China Invar Metal Suppliers – Certified Reference Material – Shandong Institute of Metallurgical Science Detail:

Table 1. Certified Values for ZBK 306 (Mass Fraction %)

Number	Elements	TFe	FeO	SiO₂	Al₂O₃	CaO	MgO
ZBK 306	Certified Values	65.66	0.54	1.92	1.64	0.056	0.102
ZBK 306	Uncertainty	0.17	0.06	0.04	0.04	0.006	0.008
Number	Elements	S	P	Mn	Ti	K₂O	Na₂O
ZBK 306	Certified Values	0.022	0.060	0.135	0.048	0.018	0.007
ZBK 306	Uncertainty	0.001	0.002	0.003	0.002	0.002	0.002

Table 2. Analysis methods

Composition	Method
TFe	Titanium(III) chloride reduction potassium dichromate titration method
FeO	Potassium dichromate titration methodThe potentiometric titrimetric method
SiO₂	Perchloric acid dehydration gravimetric methodThe silicomolybdic blue spectrophotometric methodICP-AES
Al₂O₃	Complexometric titration methodThe chrome azurol S photometric methodICP-AES
CaO	ICP-AESAAS
MgO	ICP-AESAAS
S	Barium sulfate gravimetric methodThe eombustion iodometric method for the determination of sulfur content
P	Bismuth phosphomolybdate blue spectrophotometric methodICP-AES
Mn	Potassium periodate spectrophotometric methodICP-AESAAS
Ti	Diantipyryl methane photometric methodICP-AES
K₂O	ICP-AES AAS
Na₂O	ICP-AES AAS

Expiration of certification: The certification of this CRM is valid until December 1, 2028.

Table 3. Methods for homogeneity testing

Composition	Analysis methods	Minimum sample (g)
TFe	Titanium(III) chloride reduction potassium dichromate titration method	0.2
FeO	Potassium dichromate titration method	0.2
SiO₂, Al₂O₃, CaO, MgO	ICP-AES	0.1
Mn, Ti	ICP-AES	0.2
P, K₂O, Na₂O	ICP-AES	0.5
S	The eombustion iodometric method for the determination of sulfur content	0.5

The certified reference material is packed in glass bottles with plastic covers. The net weight is 70 g each. It is suggested to keep dryness when stored. The certified reference material should be dried at 105℃ for 1 hour before use, then it should be taken out and cooled to room temperature.

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