EPA Method 312B

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EPA Method 312B:
DETERMINATION OF RESIDUAL STYRENE IN STYRENE-BUTADIENE (SBR) RUBBER LATEX BY CAPILLARY GAS CHROMATOGRAPHY

Summary:
A weighed sample of a latex solution is coagulated with an ethyl alcohol (EtOH) solution containing a specific amount of alphamethyl styrene (AMS) as the internal standard. The extract of this coagulation is then injected into a gas chromatograph and separated into individual components. Quantification is achieved by the method of internal standardization.

Scope:
This method is applicable to SBR latex solutions. 1.2 This method quantitatively determines residual styrene concentrations in SBR latex solutions at levels from 80 to 1200 ppm.