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Analytical Instrumentation Improve sampling and detection of carbonyls in air


Achieve sensitive and reliable results with air sampling media for a wide range of applications in various confi gurations for solvent desorption, thermal desorption, passive and whole air sampling from Supelco®


, a Merck brand. Ensure low background for carbonyl sampling with products that are produced to the highest quality standards in a carbonyl controlled manufacturing environment that is complemented by high-purity solvents and calibration standards.


The sampling of aldehydes and ketones requires an on-site derivatisation on a coated adsorbent e.g. with 2,4-dinitrophenylhydrazine (2,4-DNPH). The Supelco® product range includes the low back pressure DNPH (LpDNPH) cartridges (available in 6 different confi gurations and 16 products) for active sampling, which ensure longer pump operation, glass tubes (ORBO™) and DNPH coated fi lters as well as devices with otherwise coated adsorbents for sampling carbonyls.


The Supelco® product range is suitable for OSHA, NIOSH, ASTM, EPA and CARB methods


LpDNPH cartridges are air sampling devices designated for sampling carbonyls (e.g. formaldehyde) in ambient, indoor and industrial atmospheres. Carbonyls are trapped on a high-purity adsorbent coated with 2,4-dinitrophenylhydrazine where they are converted to hydrazone derivatives. The derivatives are eluted from the cartridge with acetonitrile and analysed by HPLC, in most cases. Select LpDNPH products are vacuum packaged in our low-background storage bag to ensure purity.


Method Applications are: US EPA IP-6A – Determination of formaldehyde and other aldehydes, US EPA TO-11A – Method for determination of formaldehyde in ambient air using adsorbent cartridge followed by HPLC, US EPA 100 – sampling for formaldehyde and other carbonyl compounds, ASTM Method D5197 – Standard test method for determination of formaldehyde and other carbonyl compounds, NIOSH 2016 – Formaldehyde, NIOSH 2532 – Glutaraldehyde, NIOSH 2539 – Aldehydes, screening, NIOSH 2541 – Formaldehyde by GC, NIOSH 3500 – Formaldehyde by VIS; Impinger method, OSHA 52 – Acrolein and/or formaldehyde, OSHA 64 – Glutaraldehyde, OSHA 81 – Crotonaldehyde and OSHA 85 – Valeraldehyde.


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For More Info, email: email:


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Does it matter if distillation fl asks aren’t made from borosilicate glass?


There is a copious amount of glassware to be found in any laboratory and it can be found in a wide range of shapes and sizes.


In recent years many labs have switched from glass vessels to cheaper and less fragile plastic materials but, in most cases, due to the nature of the samples handled and with the precise tolerances or specifi cations written into international standards, this is not an option for the petroleum industry.


Many techniques such as distillation, chromatography, centrifugal and extraction, to name but a few, are performed over a range of conditions including signifi cant changes in temperature. Testing under these conditions affects the lifespan of glassware.


Borosilicate glass contains boron trioxide which allows for a low coeffi cient of thermal expansion, which means borosilicate glassware can withstand the more extreme temperature changes associated with petroleum testing. The durability of borosilicate and quartz has clear cost advantages and, over time, enables a better accuracy of results than other glass materials.


Atilano Martinez, CEO of Crystal Science USA Corporation, says “we pride ourselves on customer service, in addition to providing high quality products. Crystal Science offer design and engineering services enabling us to provide the petroleum market with bespoke solutions for specifi c applications or special projects.” Martinez continues, “last year we celebrated 10 years in business and we look forward to continued growth and serving the petroleum market for decades to come”.


The team at Crystal Science USA have more than 30 years of experience in manufacturing high quality, ASTM standard glassware using both borosilicate glass and quartz materials.


For More Info, email: email:


For More Info, email: email:


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High Quality ASTM Glassware SUPPLYING THE PETROLEUM INDUSTRY FOR OVER 10 YEARS


High Quality Glassware Manufactured to Meet the International Standard Methods


WE SPECIALIZE IN:


• Distillation Apparatus • Reaction Equipment • Extraction Apparatus


and Many More Products PH: +1 832 257-2578 PINEHURST, TEXAS, USA sales@Laboratory-glass.com Crystalscienceusa@Gmail.com www.crystalscienceusa.com Crystal.indd 1 28/08/2018 10:27 OCTOBER / NOVEMBER • WWW.PETRO-ONLINE.COM


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LTE Scientifi c has just launched its new eco- drying cabinet range for glassware, offering massive energy savings when compared to conventionally constructed glassware drying cabinets.


In tests, the DL100E used only 0.1kWh to get from 22°C to 60°C and then only 0.125kWh thereafter to maintain that temperature. At a constant 75°C the DL100E only used 0.188kWh.


Available in 4 sizes from 100 to 1000-litres,


the eco-drying cabinet range is fully insulated on 5 sides and supplied with glass sliding doors or double glazed doors, depending on the model chosen.


Digital temperature control, a 7 day timer and 2-year warranty come as standard on all models.


LTE’s hygienic Sterling anti-bacterial coating is used on all the outer casings, whilst all interiors are manufactured from stainless steel.


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Polyethylene (PE) materials JSB has released a new application note, ‘Improved Polymer Analysis by Using PyrolysisGC×GC-MS: Diverse Polyethylene (PE) Materials’, describing how to overcome the challenge of too complex pyrolysis profi les when using GC-MS.


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Pyrolysis coupled to comprehensive two-dimensional gas chromatography-mass spectrometry (py-GC×GC-MS) is a very powerful technique for the characterisation of complex matrices. In the application note the Pyrolysis-GCxGC-MS method was applied to two polyethylene standards with low (LD-PE) and high (HD-PE) density as well as real-life PE packaging materials.


The results established that Py-GC×GC-MS is a very powerful analytical tool for improved polymer analysis and that 2D pyrograms provide more accurate and detailed sample characterisation, as well as proving remarkably effective for sample comparison and fi ngerprinting. The differences in the pyrolysis profi les of LD-PE and HD-PE standards and samples are highlighted with a level of detail that would not be possible by py-GC-MS and the real-life PE samples are effectively grouped as LD or HD materials with PCA analysis. Furthermore, it is possible to detect and identify unknowns of possible interest, such as antioxidants and UV light stabilisers, in an easier and more confi dent way.


Do you want to know more about this application note? For further information visit www.go-jsb.com


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Using Pyrolysis-GC×GC-MS for improved polymer analysis of diverse


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