GB/T 14422-2008Analysis of water used in boiler and cooling system - Determination of benzotriazole (English PDF)

Foreword

This standard replaces GB/T 14422-1993 "boiler water and cooling water analysis benzene Benzotriazole UV spectrophotometric determination Law degree."

This standard and GB/T 14422-1993, compared, no differences in technical content, structure and main text of the standard was part modify.

Appendix A of this standard is a normative appendix.

1 Scope

This standard specifies the determination of boiler water and cooling water of benzene Benzotriazole.

This standard applies to cold water and cooling water inside the generator Benzotriazole benzene content of 0.5mg/L ~ 5mg Determination/L of.

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 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)

3 Method summary

Benzene Benzotriazole has two maximum absorption peak at 259nm and 268nm place. Organics in water samples also absorb at 259nm, so instead Directly measured at 268nm, and no benzene was concentrated and add water after using Benzotriazole as a blank control solution, in order to eliminate such interference.

4 Reagents and materials

The reagents used in this standard, unless otherwise stated, use only analytical reagent.

Safety Tips. strong base used in this standard is corrosive, should pay attention. When contacted, rinse with plenty of water, avoid inhaling Or contact with the skin.

4.1 Water, GB/T 6682, three.

4.2 Potassium hydroxide solution. 56g/L.

4.3 Benzene Benzotriazole Standard Solution. 100mg/L.

Weigh 0.1000g benzene Benzotriazole, accurate to 0.2mg. 1mL potassium hydroxide solution was added, and dissolved, and then transferred to a 1L Volumetric flask, and diluted with water to the mark. This solution 1mL containing 0.1mg benzene Benzotriazole.

5 Instruments and equipment

The following general laboratory instruments and equipment.

5.1 UV - visible spectrophotometer.

5.2 Quartz absorption cell. 1cm.

5.3 Volumetric flask. 100mL.

6 Analysis Step