New Dry Sampler for Reliable Measurements in Air

Sigma-Aldrich/Supelco (USA), found on stand 11 at AQE, launched the new ASSET™EZ4-NCO Dry Sampler for reliable isocyanate measurements in air. The easy-to-use sampler was developed by the Institute for Kemisk Analys Norden AB (IFKAN) in Lund, Sweden and complies with ISO 17734-1 Determination of organonitrogen compounds in air using LC-MS Part 1: Isocyanates using dibutylamine derivatives.

The patented design of the cartridge and the use of dibutylamine as derivatising reagent provide the highest sensitivity and stability of the derivatives. Unlike common isocyanate sampling devices, ASSET EZ4’s capacity allows for work place measurements from 5 minutes to 8 hours for true time-weighted average (TWA). Additionally, the design ensures particulates are completely derivatised, preventing underestimation of exposure. It does not require field desorption or any special storage conditions before or after sampling, has a two-year shelf life, and is recommended to be analysed by LC-MS/MS within four weeks after sampling. It is supported by a set of calibration standards, including a deuterated internal standard for LC-MS/MS analysis.