Determination of polymerization inhibitor (p-tert-butylcatechol) content in styrene for industrial use. Spectrophotometric method (1)

1 Scope

This section specifies the determination method of p-tert-butylcatechol (TBC) content in styrene for industrial use

This part is applicable to the determination of TBC content in styrene for industrial use, and its applicable range is 1mg/kg～100mg/kg

Any other compound contained in styrene that can produce color with the sodium hydroxide alcohol solution will interfere with the determination.

This section is not intended to explain all safety issues related to its use

Note: Styrene is flammable

2 Normative references

The clauses in the following documents become clauses of this part after being quoted in this part of GB/T12688

GB/T 3723 General Rules for Sampling Safety of Industrial Chemical Products (GB/T3723-1999, ISO3165:1976, idt)

GB/T 6680 General Rules for Sampling of Liquid Chemical Products

GB/T 6682 Analytical Laboratory Water Specifications and Test Methods (GB/T66822008, ISO3696:1987, MOD) GR/TR170 Numerical Rounding Rules and the Expression and Judgment of Limit Values

3 Principles of the method

The sodium hydroxide alcohol solution was added to the styrene sample to produce a pink color

4 Reagents and materials

Unless otherwise noted, the reagents used in this section should be of analytical grade

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Note: TBC is severely corrosive to the skin, especially when it is melted or in a concentrated solution.

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