Environmental Laboratory 51 Ultrasonic
cleaning solutions for laboratory applications
High quality reference
standards for PFAS analysis Per- and Polyfl uorinated Substances (PFAS) analysis is becoming more important than ever as these persistent environmental contaminants are being identifi ed in surface water, ground water as well as in animal and human populations across the globe. To address this world-wide pollutant, different regulatory agencies around the world continue to release test methods for the analysis of these compounds.
Currently, there are promulgated methods from the USEPA, ASTM, and ISO for the analysis of these compounds in different matrices. The one thing all of these methods have in common is the requirement for low detection limits which makes the use of a high quality reference standards essential for accurate calibration and routine daily checks.
There are hundreds of PFAS compounds currently listed as being found environmentally, and many more will likely be discovered. AccuStandard offers a wide range of PFAS Certifi ed Reference Materials (CRMs) as single as well as multiple component mixes. For instance, our M-8327 - Perfl uorinated Native Compound Standard product contains 24 of the most commonly analysed PFAS at 2 µg/mL in a methanol/water matrix. This product can be used for many different methods and allows for easy and effi cient calibration. Other products include CRMs for test methods ASTM D8421, USEPA 1633 and ISO 21675:2019.
The cavitation phenomenon consists of the formation and growth of millions of microscopic bubbles under a low-pressure stage, produced into the ultrasonic bath due to a high power transducer 40kHz. These bubbles break in all directions and attack every surface in contact with water, erasing dirt, impurities and pollutants when contacting with the materials or pieces into the bath. This phenomenon allows cleaning all kind of items without the need of disassembling, due to all the surfaces being
in contact with the liquid. The heating function of the unit allows the acceleration of this cleaning process.
Wiggens presents two series of standard ultrasonic cleaners with reliable quality and useful features, which allows the users a wide range of cleaning applications such as lab materials, medical instruments, dental prosthesis, optics, industrial items, jewelleries, also the degasifi cation or liquid dissolution and compact substances disaggregation.
The following are the standard working volumes supplied: 3, 6, 10 and 22 litres, and bespoke volumes can be ordered for different applications. All functions can be viewed and monitored on a large and clear touch screen display. The parameters can be set by screen touching, including the ultrasonic working power (40% to 100%), bath temperature (20°C to 80°C), timer and warning function for safety.
All models are equipped with lids and trays that allow the parts they introduce to be directly cleaned without damaging the transducers and for easy handling.
In addition to the standard ultrasonic cleaners, Wiggens also offers the ultrasonic cleaners with special added functions. The Shaking Ultrasonic Cleaner is a good example, which means that the sample can be pre-homogenised at a specifi c shaking speed, and then fi nal homogenisation can be achieved in a very short time, using ultrasonic power These two procedures can be carried out simultaneously or separately. Another added function is an ultrasonic cleaner with cooling for use in pathology and analysis labs, where the temperature of bath can be maintained at 10°C to 40°C even with the ultrasonic power generating heat continuously.
Contact Wiggens to accelerate your cleaning process.
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AccuStandard offers many other single component CRMs available to help the analytical chemists in meeting the requirements for these methods. AccuStandard has 35 years of experience formulating chemical reference standards to aid the analytical community. They are accredited to ISO 17034:2016, and 17025:2017 as well as certifi ed to ISO 9001:2015.
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58265pr@reply-direct.com FM4, the new PFAS Air Sampler
PFAS have been under a magnifying glass for some time now. At the time of their discovery, PFAS was being closely watched due to its unique features. Since then, PFAS structures with different qualities have been developed. Today, PFAS are being closely monitored due to being bioaccumulative and persistent. This results in both environmental and health issues. While over 5000 different PFAS structures are currently known, only 250 types are of such interest that they should be monitored. However, this number is growing. Due to their posing risks, new applications are being released on a monthly basis.
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Most new methods focus on extracting PFAS from soil- and water samples. The latest detectors and SPE methods are advertised across the market. Most samples are analysed using LC/MS. The sampling of PFAS in water is well described in ISO 21675. The detection of PFAS in air is not yet well described. It has been shown that PFAS can have an atmospheric residence time of up to 80 days. There are methods available that include sampling PFAS on Thermal Desorption tubes, they are being analysed with TD-GC-MS. However, they do exclude some specifi c PFAS types.
PFAS in air comes in different forms, neutral and ionizable. It has been suggested in several articles that the composition of PFASs forms in the air is different from the composition after having been collected by sampling equipment. In collaboration with dr. Yamashita, co-author of ISO 21675, an air sampler, the FM4, has been developed to address this issue. The FM4 is designed as a cascade impactor, followed by a PUF fi lter. The last fi lter used is a newly developed GAIAC ™ fi lter. Once collected, the PFAS can be extracted by washing all fi lters. The used analysis techniques are both LC/MS and GC/MS for the different fi lters.
While the damage that is done by all the different PFASs is still not fully understood, the awareness of the PFAS risks have grown signifi cantly. The FM4 is the fi rst huge step in recovering the presence of PFAS in air. For more information on the FM4, please visit GL Sciences.
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