GB/T 22804-2008Pulp, paper and board - Determination of mercury content (English PDF)

1 Scope

This standard specifies the method for determination of pulp, paper and paperboard mercury content.

This standard applies to the determination of paper, paperboard and pulp in the mercury content of the various available wet nitric acid digestion.

The detection limit. 0.02mg/kg.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 450 and take samples to an aspect of paper and paperboard samples, positive and negative determination (GB/T 450-2008, ISO 186.

2002, MOD)

GB/T 462 paper, board and pulp - Determination of water sample (GB/T 462-2008; ISO 287. 1985, MOD;

ISO 638. 1978, MOD)

GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213. 1981, IDT)

GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)

Principle 3

The sample was placed in a closed container, adding a certain amount of nitric acid at high temperature and pressure conditions, digestion. Digestion solution appropriately diluted

After the restore process by reducing state mercury compounds into atomic states of mercury, the carrier gas into the quartz tube furnace, a wavelength in the low-pressure mercury lamp

253.7nm excitation beam excitation, produce atomic fluorescence, and fluorescence intensity is proportional to the mercury content of the sample, and compare the standard curve into

Line quantitative analysis.

4 Reagents

Unless otherwise indicated, used in the analysis confirmed only for the gifted class pure reagents.