Aerosols of Isocyanates, Amines and Anhydrides: Sampling and Analysis

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Dahlin, Jakob,1976-Stockholms universitet,Institutionen för analytisk kemi (författare)

Aerosols of Isocyanates, Amines and Anhydrides : Sampling and Analysis

BokEngelska2007

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Stockholm :Institutionen för analytisk kemi,2007
82 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:su-6786
ISBN:9789171554154
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6786URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:dok swepub-publicationtype

Anmärkningar

This thesis presents methods for air sampling and determination of isocyanates, amines, aminoisocyanates and anhydrides. These organic compounds are generated during thermal degradation of polymers such as polyurethane (PUR) or epoxy.Isocyanates, amines and anhydrides are airway irritants known to cause occupational asthma. Some of the compounds are listed as human carcinogens. Many workers are exposed.Isocyanates and anhydrides are reactive and needs to be immediately derivatized during sampling. Methods have been developed for determination of airborne isocyanates, aminoisocyanates and anhydrides using di-n-butylamine (DBA) as reagent to form stabile urea derivatives or amide derivatives. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) enabled detection limits as low as 10 attomoles. A nitrogen-selective LC-detector enabled quantification of DBA-derivatives in reference solutions. A novel sampler is presented. The sampler consists of a denuder in series with a three-stage cascade impactor and an end filter. The sampler made it possible to reveal the distribution of isocyanates between gas and different particle size fractions. During thermal degradation of PUR, isocyanates were associated to particle size fractions (<1 µm) that may penetrate to the lower airways. The distribution during 8 minutes changes noticeably. Aromatic isocyanates become associated to small particles (<1 µm). As a reference method, air-sampling was performed using an impinger filled with di-n-butylamine (DBA) in toluene, connected in series with a glass fiber filter. There was a good agreement between the denuder-impactor sampler and the reference method.

Ämnesord och genrebeteckningar

NATURVETENSKAP Kemi Analytisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Analytical Chemistry hsv//eng
isocyanate
amine
aminoisocyanate
organic acid anhydride
denuder
impactor
impinger
air sampling
LC-MS
LC-CLND
di-n-butylamine
DBA
thermal degradation
aerosol
particles
TDI
MDI
HDI
ICA
MIC
IPDI
exposure
occupational health
Analytical chemistry
Analytisk kemi
Analytical Chemistry
analytisk kemi

Biuppslag (personer, institutioner, konferenser, titlar ...)

Skarping, Gunnar,professorStockholms universitet,Institutionen för analytisk kemi (preses)
Streicher, Robert P.,Dr.National Institute for Occupational Safety and Health (NIOSH), Cincinnati (opponent)
Stockholms universitetInstitutionen för analytisk kemi (creator_code:org_t)

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Av författaren/redakt...: Dahlin, Jakob, 1 ...; Skarping, Gunnar ...; Streicher, Rober ...

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NATURVETENSKAP: NATURVETENSKAP; och Kemi; och Analytisk kemi

Av lärosätet: Stockholms universitet

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