GB/T 23979.2-2009Fluorescent whitening agents - Determination of relative whiteness and shade - Dyeing method for paper (English PDF)

1 Scope

This standard specifies the method for measuring the sheet fluorescent whitening whitening whitening intensity and shade.

This standard applies to the determination of the fluorescent whitening agent whitening paper strength and shade.

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.

General conditions GB/T 2374-2007 Determination of dyes provisions

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

GB/T 7973 paper, board and pulp - Determination of diffuse reflectance factor (diffusion/vertical method) (GB/T 7973-2003, ISO 2469.

1994, NEQ)

GB/T 7974 paper, paperboard and pulp brightness (whiteness) measured (diffusion/vertical method) (GB/T 7974-2002, ISO 2470.

1999, NEQ)

3 equipment and materials

Equipment and materials shall comply with GB/T 2374-2007 relating to equipment and materials; experimental water should comply with GB/T 6682-

2008 three water requirements.

a) white Instrument. should meet GB/T 7973 and GB/T relevant requirements in 7974;

b) analytical balance. a sense of the amount of 0.0001g;

c) with a small laboratory padding machine;

d) rapid qualitative filter paper;

e) brown volumetric flask.

4 Determination