Air Monitoring

ASSET™ EZ4-NCO Dry Sampler for Isocyanates

Providing Ultimate Sensitivity for Vapor Phase and Particulate Isocyanates

The ASSET EZ4-NCO dry sampler for isocyanates is the easy-to-use sampler offering the ultimate sensitivity for collection & measurement of vapor phase and particulate isocyanate monomers and oligomers.

Key Features and Benefits
  • Ability to achieve reliable, low detection limits
  • Only device to measure vapor phase and aerosole isocyanates
  • Sampling for > 8 hrs
  • No special storage conditions required for the sampler, before or after sampling; stable for 4 weeks after sampling
  • No interferences, no field extraction
  • 2 year shelf life

What's New
OSHA National Emphasis Program (NEP)
World Regulatory Update
Technology Overview
Supporting Data
References
Analytical Service Laboratories
Europe
Institut Alpha GmbH & Co. KG
Institut für Umwelt- und Arbeitsplatzanalytik Burkon GmbH
Institutet För Kemisk Analys Norden AB (IFKAN)
Hall Analytical Laboratories Limited
  North America
ALS Environmental
Bureau Veritas
Australia
SGS-Leeder

Technical Resource: Sample Extraction Procedure for ASSET
Ordering Information - ASSET Sampler, Analytical Standards




Video Introduction to ASSET
(4min)


Product flyer

Interested in evaluating this new technology? Contact: kristen.schultz@sial.com 


What's New
A complete line of isocyanate calibration and internal standards are available for both the monomers and oligomers. The monomers standard is an 11 diisocyanate mixture and will become a CRM soon. Certified Reference Materials (CRM) are available for the following monomers and oligomers:
  • HMDI
  • HDI Adducts
  • Polymeric MDI (pMDI)
  • IPDI Oligomers
  • TMX-Diisocyanate
View ordering information for analytical standards.

For more information on the ASSET sampler or to request the analytical protocol, please contact Kristen Schultz at kristen.schultz@sial.com or 1-814-359-5718.

OSHA National Emphasis Program (NEP) on Isocyanates
In June 2013, OSHA announced a new National Emphasis Program (NEP) (view PDF) for occupational exposure to isocyanates that will focus on workplaces in the general, construction, and maritime industries in which isocyanate compounds are used. Over a 3-year period, OSHA will focus outreach efforts and inspections on isocyanate hazards in an effort to reduce occupational illnesses, injuries, and deaths, and to raise awareness of the health effects associated with exposure to isocyanates, which can cause occupational asthma; irritation of the skin, eyes, nose, and throat; and cancer. Workers in jobs such as painting, blowing foam insulation, and the manufacture and thermal degradation of polyurethane products may be exposed to these hazardous chemicals.

Within this program OSHA issued an official statement that it is now their recommendation that all isocyanates regardless of physical state (vapor or aerosol) shall be field desorbed. The rationale behind this decision is confirmed by the article from Karoly, American Industrial Hygiene Journal 59:645-647, 1998, which showed under reporting of MDI when samples were not field desorbed. There is a consensus in the industry that the majority of the isocyanate sampling, especially when aerosols reach a certain size (> 2 µm) the sample collected will underestimate the airborne concentration.

Basically, OSHA is now recognizing that using a wet sampler underestimates isocyanate exposures because it does not discern collection of vapors from aerosols. This means that field desorption will be required for wet samplers such as 1,2-PP coated filters and the ISO-Chek back-filter. As a result, other sampling techniques must be used to avoid this hassle, complexity, and reliability issues associated with field desorption. Therefore impinger methods or the Supelco ASSET EZ4-NCO dry sampler must be used.

If you want to be in compliance with the OSHA NEP you will either need to sample with glass impingers, derivatize your wet samplers in the field, or collect your samples on the easy to use ASSET sampler.

World Regulatory Update
Piperazine compounds are commonly used in isocyanate sampling devices as derivatives to convert the reactive isocyanates into stable compounds that can be analyzed by HPLC. In the United Kingdom, early in 2013, piperazine compounds were declared controlled substances as a result of these compounds being used for the manufacturing of illegal designer drug formulations. Therefore the 1,2-pyridyl piperazine (PP) wet sampler for OSHA methods 42 & 47 cannot be used as well as the impinger solution containing 1-(9-anthracenylmethyl) piperazine (MAP) for NIOSH 5525 and the UK MDHS 25/3 methods. In addition, the ISO-CHEK® back-filter containing 1-(2-methoxyphenyl) piperazine (MOPIP) can also not be used for sampling and analysis of isocyanates

Since ASSET EZ4-NCO Dry Sampler does not contain any piperazine compounds, it does not face regulatory or compliance issues in the UK.

Technology Overview
Isocyanates are used in the production of polyurethane (PUR) materials, one of the most widely used plastics in the world. Workers who are exposed to these compounds are at risk for respiratory disorders, asthma and other health conditions. With current isocyanate sampling devices, there are certain disadvantages to deploying the samplers in the field; such as the need to ship reagents to the sampling location, and also the need for field desorption. It is also known that particulates form incomplete reactions, with the reagent as well as the isocyanate monomers and oligomers being measured, which results in underestimation of exposure.

The ASSET EZ4-NCO Dry Sampler for isocyanates is safe for the worker to use for personal sampling because it requires no field addition of reagents, no field extraction, and no special storage requirements. In addition, it is the only sampling device that achieves reliable low detection limits compared to existing commercially available devices. The ASSET EZ4-NCO sampling device is a unique dry sampler based on derivatization of isocyanate groups with di-n-butylamine (DBA). The sampler consists of a denuder and a filter, both impregnated with DBA. The extract is analyzed using LC-MS/MS offering the ultimate sensitivity and low detection limits not capable with other methods.

Derivatization Reaction

When the isocyanate reacts with dibutylamine it forms stable urea derivatives that do not break down further after sampling and during storage. The design of the sampling device creates a stable "reagent-rich" environment that derivatizes the vapor phase and particulate isocyanates completely, including the "haystack" particulates that are not derivatized in other sampling devices.

Advantages
Other currently existing isocyanate sampling devices contain a "wet" reagent on filter media or in an impinger, which restricts the sampling time in the workplace environment. These devices are limited to a 15-minute sampling time because the capacity of the filter is not capable of sampling longer due to stability issues; or devices that use an impinger are unsafe for the worker to wear in the breathing zone.

The ASSET EZ4-NCO dry sampler overcomes both these limitations, and is capable of true "Time Weighted Average" (TWA) sampling of the work environment.
  • Increased worker productivity, no need to take the worker off the job to outfit in an impinger or wet sampler for 15-minute increments during the workday resulting in lost time.
  • Saves money over existing samplers. Sampling for 8-hrs reduces the number of sampling devices required and the cost of testing samplers.
  • Shipping reagents is eliminated; no customs hassles; reduces risk of loss of sampling devices before and after sampling.
  • Reliable results, no field desorption or analytical finish uncertainty
  • After sampling, the ASSET EZ4-NCO device is stable with no special storage requirements; no immediate testing required, lab testing recommended within 4 weeks after sampling.

Isocyanate Detection

The ASSET EZ4-NCO Dry Sampler has been thoroughly tested for the following compounds.

Aliphatic Monomers:
  • Ethyl Isocyanate (EIC) CAS 109-90-0
  • Hexamethylene Diisocyanate (HDI) CAS 822-06-0
  • Isocyanic Acid (ICA) CAS 75-13-8
  • Isophorone Diisocyanate (IPDI) CAS 4098-71-9
  • Methyl Isocyanate (MIC) CAS 624-83-9
  • Propyl Isocyanate (PIC) CAS 110-78-1
Aromatic Monomers:
  • Phenyl Isocyanate (PhI) CAS 103-71-9
  • 4,4'-Methylenediphenyl Diisocyanate (MDI) CAS 101-68-8
  • 2,4-Toluene Diisocyanate (2,4-TDI) CAS 584-84-9
  • 2,6-Toluene Diisocyanate (2,6-TDI) CAS 91-08-7

Oligimers - Coming Soon

Supporting Data - Monomers

Detection Limits
The results below are indicative of typical performance obtained from an LC-MS/MS instrument; results may vary slightly depending on the instrument used.
Analytical Conditions: Instrument: Agilent 1100 LC-MS/MS; Column: Ascentis® Express C18, 5 cm × 2.1 mm, 2.7 µm (53822-U); Flow rate: 0.4 mL/min; Temperature: Ambient; Injection volume: 2 µL; Mobile phase composition: Gradient elution is performed from 60/40/0.05 water/acetonitrile/formic acid to 20/80/0.05 in 8 min.

  Instrumental
Detection Limit
(fmol)
1 L (5 min sampling) 96 L (8 hr sampling)
Compound LOD (ng/m³)
LOQ (ng/m³)
(50 x LOD)
LOD (ng/m³) LOQ (ng/m³)
(50 x LOD)
MIC 0.6 6.8 340 0.071 3.6
EIC 2 29 1400 0.29 15
PIC 0.3 5.1 250 0.053 2.7
PhI 0.5 12 590 0.12 6.2
HDI 0.05 1.7 84 0.018 0.9
2,6-TDI 0.02 0.7 35 0.007 0.4
2,4-TDI 0.01 0.3 17 0.004 0.2
IPDI 1 0.06 2.7 130 0.028 1.4
IPDI 2 0.04 1.8 89 0.019 0.9
4,4’-MDI 0.03 1.5 75 0.016 0.8

TWA Sampling
Duplicate air samples were collected with different sampling times from an exposure chamber using the ASSET EZ4-NCO sampler. Isocyanate concentrations inside the exposure chamber were continuously generated to maintain constant concentrations using gas/liquid permeation technique. The sampling time is up to 10 hours (600 min) with linear response of the sampled amount; indicating the sampler has very high capacity and is very stable.
Correlation of Sampling Time with Amount of Sampled Isocyanate




References

Sampler technology protected by US Patent number US 7,700,045 B2; Apr. 20, 2010.

Methods:

ISO 17734-1:2013, Determination of Organonitrogen Compounds in Air Using Liquid Chromatography and Mass Spectrometry
Part 1: Isocyanates Using Dibutylamine Derivatives.
Part 2: Amines and Aminoisocyanates Using Dibutylamine and Ethyl Chloroformate Derivatives.
Authors: Gunnar Skarping, Marianne Dalene and Daniel Karlsson


In the following technical ISO report, the technology is described as the only methodology that covers all situations:

ISO/TR 17737:2012, Workplace Air - Guidelines for Selecting Analytical Methods for Sampling and Analyzing Isocyanates in Air
Authors: Gunnar Skarping, Marianne Dalene and Daniel Karlsson
Publications:

Isocyanates, Amines and Alkanolamines: Sampling, Chromatography and Detection
Author: Riddar, Jakob B,
Affiliation: Department of Analytical Chemistry, Faculty of Science, Stockholm University, P.O. Box 460, S-28124 Hassleholm, Sweden
Journal: Doctoral thesis, comprehensive summary (Other academic), 2013

Dry Sampling of Gas-Phase Isocyanates and Isocyanate Aerosols from Thermal Degradation of Polyurethane
Authors: Daniel Gylestam, Jakob B Riddar, Marianne Dalene and Gunnar Skarping
Affiliation: Department of Analytical Chemistry, Work Environment Chemistry, Stockholm University, P.O. Box 460, S-28124 Hassleholm, Sweden
Journal: Annals of Occupational Hygiene, 2013, Aug 9

Solvent-Free Sampling with Di-n-Butylamine for Monitoring of Isocyanates in Air
Authors: Asa Marand, Daniel Karlsson, Marianne Dalene and Gunnar Skarping
Affiliation: Department of Analytical Chemistry, Work Environment Chemistry, Stockholm University, P.O. Box 460, S-28124 Hassleholm, Sweden
Journal: Journal of Environmental Monitoring, 2005, 7, 335-343

Determination of Airborne Isocyanates as Di-n-Butylamine Derivatives Using Liquid Chromatography and Tandem Mass Spectrometry
Authors: Daniel Karlsson Jakob Dahlin, Asa Marand, Gunnar Skarping, Marianne Dalene
Affiliation: Department of Analytical Chemistry, Work Environment Chemistry, Stockholm University, P.O. Box 460, S-28124 Hassleholm, Sweden
Journal: Analytica Chimica Acta, 2005, 534, 263-269

Analytical Service Laboratories
Analytical Services available in Europe
Institut Alpha GmbH & Co. KG
Dornstadter Weg 15
89081 Ulm-Jungingen
Tel. 0731 66088
E-mail: info@alpha-ulm.de

The Institut Alpha GmbH & Co. KG was founded in 1985 in Ulm, Germany and is DAkkS-accredited in according to DIN EN ISO 17025.

More than 20 qualified employees, chemists, biologists, geologists and laboratory technicians, are working according to German and international standards, DIN, EN and ISO. We are offering the complete spectrum of sampling, analyzing and reporting for many kinds of environmental pollution. One subarea are the analytics of room air for hazardous substances and identification of emission sources, emission measurements and analysis of at-work conditions.

Further areas are the analysis of drinking water, ground water, communal and industrial waste water, soil, sludge, waste and food for organic and inorganic compounds. Dr. rer.nat. Dieter Heilemann is an according to German law officially appointed and sworn in expert for water- and waste water chemistry.

Our equipment includes GC-FID, GC-MS/MS with liquid- headspace- and thermal desorption-system, LC-MS/ MS, HPLC with fluorescence-and UV-detection, anion chromatography, ICP-AES, AAS with graphite furnace, AOX, EOX, POX combustion device with coulometer, TOC measuring unit for liquids and solids, IR and UV-VIS photometry.

The analytical performance profile and enormous range of experience in the efficient management of laboratory activities makes the Institut Alpha GmbH & Co. KG your first point of contact if you are considering outsourcing laboratory work that you previously carried out yourself or if you are looking for a professional laboratory operator.
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Institut für Umwelt- und Arbeitsplatzanalytik Burkon GmbH
Raudtener Straße 19b/21
90475 Nürnberg
Germany
Office
Phone 0911 / 834066
Fax 0911 / 98333344
E-mail info@ifu-burkon.de
Contact Dr. Bernd Seubert (b.seubert@ifu-burkon.de)

The Institut für Umwelt- und Arbeitsplatzanalytik Burkon GmbH (IfU Burkon GmbH) is an engineering company that specializes primarily in environmental and workplace measurements of chemical agents.
The company is also a testing laboratory both according to DIN EN ISO/IEC 17025 and § 29b Federal Immission Control Act (BImSchG). It was founded in 1987 in Nuremberg. Our qualified and experienced personnel consists of consulting engineers, chemical engineers, chemists and laboratory technicians. The laboratory equipment includes devices like LC-MS/MS, GC-MS, GC-FID, IC, HPLC, UV, AAS and others.
To study total business activities of IfU Burkon GmbH, please look at our web page (www.ifu-burkon.de).
We look forward to your inquiry and assure you an accurate and satisfying enforcement.
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Institutet För Kemisk Analys Norden AB (IFKAN)
Esplanadgatan 9
SE-281 38 Hassleholm
Sweden
Contact: Mikael Adamsson
Office: +46-451-655-61
Email: mikael.adamsson@ifkan.eu

About IFKAN: Institutet För Kemisk Analys Norden AB (IFKAN) specializes in the field of developing analytical services, mainly for the analysis of isocyanates and amines in air, biological fluids and tissues, and various materials. We have qualified and experienced personnel for examining and drawing up safety data sheets. IFKAN is currently involved in several research projects, with multinational oil companies, multinational pharmaceutical companies and home furnishing companies. We have acquired a large contact network of subcontractors specialized in their field, which makes it possible for us to work as a total supplier in large analytical research and development projects. Our customers come from a variety of sectors, such as occupational health services, the engineering industry, the pharmaceutical industry and various research organizations. IFKAN has a laboratory located in Hässleholm, Sweden. The company was founded 1999 in Lund, Sweden, and has been growing continuously. Today, IFKAN has more than 600 clients. The majorority of our clients are situated outside of Sweden, and 90 % of the annual turnover is due to export sales.
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Hall Analytical Laboratories Limited
Millbrook Business Centre
Floats Road Manchester M23 9YJ UK
Telephone: +44 (0)161 286 7889
Fax: +44 (0)161 286 7676
Email: info@hallanalytical.co.uk

Hall Analytical Laboratories specialises in providing a problem solving analytical service. The extensive range of mass spectrometric and chromatographic instrumentation combined with highly experienced and skilled scientists ensures that our clients can have the utmost confidence in the results.

Experts in:
Mass Spectrometry & Chromatography
Data Interpretation
Sample Analysis
Environmental Analysis
Method Development
Method Validation
Technology Transfer
Training - Instrumentation & Sample Preparation
  Analytical Areas:
Environmental Samples (Dioxins, Furans, PAHs, PCBs)
Pharmaceutical Impurities and Degradants
Industrial Chemicals
Extractables and Leachables
Identification of Unknowns
Quantitative Analysis
Petrochemical and Oil Industry
Agrochemicals
Foams

GLP Statutory Instrument (1999, No. 3106)
GLP Statutory Instrument (2004, No. 994)
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Analytical Services available in North America
ALS EnvironmentalALS Environmental
960 West LeVoy Drive
Salt Lake City, UT 84123
Phone: 801-266-7700
Toll Free: 800-356-9135
Fax: 801-268-9992
www.alsglobal.com

Offers full analytical service for ASSET

ALS Environmental provides a broad range of sophisticated, state of the art testing services across the globe. As a leader of analytical chemistry, ALS is a diversified international laboratory group with locations in Australia, North America, South America, Africa, Asia, and Europe.

ALS Salt Lake City, formerly DataChem Laboratories, is a premier provider of industrial hygiene analytical services, delivering quality data to assist our clients in promoting human health. Accredited by the American Industrial Hygiene Council (AIHA) since 1974, we proudly served as the premier contract laboratory for the National Institute for Occupational Safety and Health for 32 years. ALS-SLC is NELAC accredited, providing environmental analytical services to government and private clientele such as the EPA, DoD and DOE, and numerous environmental engineering firms. In supporting environmental investigation and monitoring programs, ALS-SLC performs a full range of organic and inorganic analyses using SW-846 and EPA methodologies on a wide range of sample matrices including groundwater, surface water, wastewater, soil, sludge, and hazardous waste.

In addition, we provide analytical services to assist with the detection and removal efforts of site investigators, offering mycological, endotoxin, and bacterial analyses, including microbial culture techniques, spectrophotometry, microscopy, and GC/MS methodology, on a variety of sample matrices.
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Bureau Veritas
Industrial Hygiene
22345 Roethel Drive
Novi, MI 48375
Phone: 248-344-1770
US (toll-free): 800-806-588
Fax: 248-344-2656
Email: LabonLine@us.bureauveritas.com

About Bureau Veritas: A global company specializing in the fields of Quality Assurance, Health, Safety, and Environmental (QHSE) services. With over 2,400 QHSE professionals in over 60 offices across North America, Bureau Veritas develops solutions that contribute to risk prevention and performance improvement to help organizations create long-term value through our technical and regulatory expertise. Bureau Veritas is present in 140 countries through a network of 900 offices and laboratories. It has more than 40,000 employees and a client base of more than 300,000.

We leverage our expertise in OSHA, ACGIH, NIOSH, ANSI, and other industry standards or guidelines to evaluate Industrial Hygiene procedures, policies, programs and potential exposures – developing relevant recommendations that protect your employees’ health while reducing redundancies, speeding projects, and reducing costs. We develop long-term strategies to assure continuous compliance, improve processes, and support of best management practices. With industry experience ranging from foundries to aerospace manufacturers and from small businesses to corporate giants, we can quickly pinpoint and deliver practical, client-specific solutions for a healthier workplace. By developing relationships with our clients that are based on trust, responsibility, technical expertise, and efficiency, Bureau Veritas provides effective solutions to emerging, immediate and long-term Industrial Hygiene issues.
Capabilities:
  • ASSET EZ4-NCO Dry Sampler for Isocyanates
  • Full Service Industrial Hygiene Analytical Service Provider
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Analytical Services available in Australia & New Zealand
SGS Leeder Consulting
Melbourne Office
5/18 Redland Dve
Mitcham, VIC, 3121, Australia
Phone: +61 (0)3 9874 1988;  Fax: +61 (0)3 9874 1933; Mobile: 0407 058 050
Email: adam.atkinson@sgs.com
Website: www.au.sgs.com

SGS Leeder Consulting offers analysis of the Supelco Asset EZ4-NCO dry sampler. Analysis is performed in our state-of-the-art Melbourne laboratory by LC/MS which provides sensitivity and specificity.

SGS-Leeder Consulting offers a range of specialised, high-tech, routine and non-routine analytical services. We have developed a reputation for quality and delivering results on the more difficult and complex projects in a wide range of sources including ambient air, stack sources, process streams and OH&S. SGS-Leeder Consulting other a extensive range of ISO17025 accredited analysis.

We have offices in Adelaide, Melbourne, Sydney and Brisbane, although we receive samples from all over the world. Access to leading edge technology and expertise in Australia and overseas guarantees results when you require them. Experience and multidisciplinary skills means our staff will provide you with an analytical solution. Specialised technical services, coupled with a willingness to tackle the more difficult and challenging projects ensures you will get results.

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Trademarks:
ASSET, Ascentis – Sigma-Aldrich Co. LLC.
ISO-CHEK is a registered trademark of Omega Specialty Instrument Co.