TLV-STELThreshold Limit Value-Short-Term Exposure Limit
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The electrochemical direct-reading instrument was sensitive to the PAA vapor concentration in terms of one order of magnitude below the TLV-STEL value.
For many years the French Institute for Research and Security (Institut National de Recherche et Securite) had recommended the determination of airborne PAA, with TLV-time weighted average (TWA) and TLV-STEL of 0.62 and 1.56 mg/[m.sup.3], respectively.
Due to the frequent occurrence in which the TLV-STEL and IDLH values are exceeded in normal use, a method to evaluate total PAA vapor exposure is needed.