GB/T 5687.12-2020Ferrochromium - Determination of phosphorus, aluminum, titanium, copper, manganese, calcium content - Inductively coupled plasma atomic emission spectrometric method (English PDF)

1 Scope

This part of GB/T 5687 specifies the method for determining phosphorus, aluminum, titanium, copper, manganese, calcium content by inductively coupled plasma atomic emission spectrometric method.

This part is applicable to the determination of phosphorus, aluminum, titanium, copper, manganese and calcium contents in ferrochromium, and the determination of corresponding elements in silicon-chromium alloys is also applicable to this part. The determination range of each element is shown in Table 1.

Table 1 Elements and measurement range

Analysis elements Measurement range (m/m)/%

P 0.010~0.10

Al 0.050~0.60

Ti 0.0050~0.60

Cu 0.010~1.50

Mn 0.010~1.00

Ca 0.10~1.50

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 4010 Ferroalloys sampling and preparation of samples for chemical analysis

GB/T 6682 Water for analytical laboratory use - Specification and test methods

GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values

GB/T 12806 Laboratory glassware - One-mark volumetric flasks

GB/T 12807 Laboratory glassware - Graduated pipettes

GB/T 12808 Laboratory glassware - One mark pipettes

JJG 768 Verification regulation of emission spectrometer

3 Principle

The low-carbon test portion is decomposed by hydrochloric acid, hydrogen peroxide, hydrofluoric acid and perchloric acid, and in the smoking state, hydrochloric acid is added dropwise to volatilize chromium to prepare hydrochloric acid solution; the high-carbon test portion is melted with sodium peroxide in a nickel crucible, leached with acid, and diluted to a certain volume. The emission spectrum intensity of analytical elements in the test solution or the relative intensity of yttrium is measured by inductively coupled plasma atomic emission spectrometer (ICP-AES) using high salt resistant atomizer and corresponding atomizing chamber, and the mass fraction of analytical elements is calculated based on the calibration curve.

4 Reagents

In the analysis, unless otherwise specified, only reagents with superior purity and above and water at laboratory Grade II and above in accordance with GB/T 6682 shall be used.