BS ISO 17735:2019 Workplace atmospheres. Determination of total isocyanate groups in air using 1-(9-anthracenylmethyl)piperazine (MAP) reagent and liquid chromatography

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BS ISO 17735:2019

Workplace atmospheres. Determination of total isocyanate groups in air using 1-(9-anthracenylmethyl)piperazine (MAP) reagent and liquid chromatography

Status : Current   Published : April 2019

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What is this standard about?

This document 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.




Standard NumberBS ISO 17735:2019
TitleWorkplace atmospheres. Determination of total isocyanate groups in air using 1-(9-anthracenylmethyl)piperazine (MAP) reagent and liquid chromatography
StatusCurrent
Publication Date09 April 2019
Cross ReferencesEN 1232, EN 482, ISO 17734-1, ISO 5725-2, ISO 1042:2004, ISO/TR 17737, ISO/IEC Guide 98-3, GUM:1995, ISO 16200-1
ReplacesBS ISO 17735:2009
International RelationshipsISO 17735:2019
Draft Superseded By18/30350765 DC
DescriptorsLiquid chromatography, Determination of content, Air, Sampling equipment, Gas analysis, Air pollution, Sampling methods, Occupational safety, Chemical analysis and testing, Isocyanates, Environment (working), Quality
ICS13.040.30
Title in FrenchAir des lieux de travail. Dosage des groupements isocyanates totaux dans l'air par réaction avec la 1-(9-anthracénylméthyl)pipérazine (MAP) et par chromatographie en phase liquide
CommitteeEH/2/2
ISBN978 0 580 96234 9
PublisherBSI
FormatA4
DeliveryYes
Pages38
File Size1.275 MB
Price£206.00


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