GB/T 23666-20091-Naphthol-5-sulfonic acid (L acid ) (English PDF)

1 Scope

This standard specifies the requirements naphthol 5-sulfonic acid (L acid) product sampling, test methods, inspection rules and signs, labels, packaging,

Transportation and storage.

This standard applies to 1-naphthol-5-sulfonate product quality control.

Structure.

Molecular formula. C10H8O4S

Molecular weight. 224.23 (according to 2007 international relative atomic mass)

CASRN. 117-59-5

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.

Preparation of GB/T 601 chemical reagent standard titration solution

GB/T 603 chemical reagent test methods in the formulation and preparation of products (GB/T 603-2002, ISO 6353-1 with. 1982,

NEQ)

GB/T 2381-2006 Determination of substance content of dye and dye intermediates insoluble

GB/T 6678-2003 General Principles for Sampling Chemical Products

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

GB/T 8170-2008 revised value represents about rules and limit values and judgment

3 Requirements

1- naphthol-5-sulfonic acid quality requirements shall be in accordance with Table 1.

11- naphthol-5-sulfonic acid quality requirements of table project index

Dry goods tide products

Appearance white powder

1-naphthol-5-sulfonate of mass fraction (coupling value) /% >= 80.00 >= 60.00

1-naphthol-5-sulfonate purity (HPLC) /% >= 99.00 >= 98.50

The mass fraction of water insoluble /% <= 0.10 […]