SN/T 2763.4-2012Chemical analysis of nickel laterite ore - Part 4: Determination of nickel, cobalt, aluminum, magnesium and phosphorus content - Inductively coupled plasma atomic emission spectrometric method (English PDF)

1 Scope

This Part of SN/T 3323 specifies inductively coupled plasma atomic emission spectrometry (ICP-AES), the testing method to determine the lead, chromium, cadmium contents in mill scale.

This Part is applicable to the determination of lead, chromium, cadmium contents in mill scale. The lower limit of determination for each element is shown in Table 1.

Table 1 -- Lower limit of determination for each element

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 6379.2, Measurement methods and results - Accuracy (trueness and precision)

- Part 2: Determine the standard methods of measurement repeatability and reproducibility of the basic method

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

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

GB/T 12808, Laboratory glassware - One-mark pipettes

3 Principle

The specimen is decomposed by hydrochloric acid. Use the inductively coupled plasma

Element Mass fraction % atomic emission spectrometer for testing. Use the matrix matching method to eliminate the matrix effects.

4 Reagents and materials

Unless otherwise stated, all reagents are analytically pure and above. Water is grade two water specified in GB/T 6682.

4.1 Hydrochloric acid (rho= 1.19g/mL): Guaranteed reagent.

4.2 High-purity iron powder: The iron mass fraction is greater than 99.98%.

4.3 Hydrochloric acid (1+1): Add 1 volume of hydrochloric acid (4.1) to 1 volume of water. Mix well.

4.4 Lead, chromium, cadmium standard solution (certified reference material):

1000µg/mL.

4.5 35mg/mL iron matrix solution: Weigh 3.5g of high-purity iron powder (4.2). Add

40mL of hydrochloric acid solution (4.3). Heat to dissolve. Use water to set volume constant in a 100mL volumetric flask.

5 Instruments

8 Result calculation

Calculate the content of each element according to formula (1), in mass fraction.

Where,

Xi - The content of each test element i (mass fraction), %;

ci - The mass concentration of test element found from the working curve, in micrometers per milliliter (µg/ mL);

V - The constant volume of test solution, in milliliters (mL);

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