Norm

ISO 17735:2019 en

Werkplekatmosfeer - Bepaling van de totale isocyanaatgroepen in lucht met 1-(9-anthracenylmethyl)piperazine (MAP) reagens en vloeistofchromatografie

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Over deze norm

Status Definitief
Aantal pagina's 30
Commissie Werkplek- en buitenluchtmetingen
Gepubliceerd op 01-04-2019
Taal Engels
ISO 17735 specifies a method for the sampling and analysis of airborne organic isocyanates in workplace air. This document is applicable to a wide range of organic compounds containing isocyanate groups, including monofunctional isocyanates (e.g. phenyl isocyanate), diisocyanate monomers [e.g. 1,6-hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), and isophorone diisocyanate (IPDI)], prepolymers (e.g. the biuret and isocyanurate of HDI), as well as chromatographable intermediate products formed during production or thermal breakdown of polyurethane. In mixed systems of HDI and IPDI products, it is impossible to identify and quantify low levels of IPDI monomer using this document, due to coelution of IPDI monomer with HDI-uretidinedione. It is known that the method underestimates the oligomer in MDI-based products. Total isocyanate group (NCO) is underestimated in MDI-based products by about 35 % as compared to dibutylamine titration. The method has been successfully modified to be used with LC-MS-MS for TDI monomer using an isocratic 70 % acetonitrile/30 % 10 mM ammonium formate mobile phase. The useful range of the method, expressed in moles of isocyanate group per species per sample, is approximately 1 × 10−10 to 2 × 10−7. The instrumental detection limit for the monomers using both ultraviolet (UV) detection and fluorescence (FL) detection is about 2 ng monomer per sample. The useful limit of detection for the method using reagent impregnated filters is about 10 ng to 20 ng monomer per sample for both UV and FL detection. For a 15 l sample, this corresponds to 0,7 μg/m−3 to 1,4 μg/m−3. For impinger samples, which require solid phase extraction, experience has shown that the useful limit of detection is about 30 ng to 80 ng monomer per sample.

Details

ICS-code 13.040.30
Nederlandse titel Werkplekatmosfeer - Bepaling van de totale isocyanaatgroepen in lucht met 1-(9-anthracenylmethyl)piperazine (MAP) reagens en vloeistofchromatografie
Engelse titel Workplace atmospheres - Determination of total isocyanate groups in air using 1-(9-anthracenylmethyl)piperazine (MAP) reagent and liquid chromatography
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