Environmental Analysis & Electrochemistry


Free White Paper: Green Alternative Methods for Voltammetric Analysis in Different Water Matrices


Stripping voltammetry uses electrochemical sensors for the determination of heavy metal ions in different types of samples. To meet legal regulations and eliminate the use of metallic mercury, Metrohm has developed Hg-free sensors. These Hg-free sensors can measure trace levels of cadmium, lead, zinc, arsenic, chromium, and other heavy metals in various water matrices ranging from boiler feed to drinking to sea water samples. A free White Paper presents the details of this solution along with several application examples.


Low detection limits (between µg/L and ng/L), the possibility to distinguish between different oxidation states (e.g., As(V) and As(III)) as well as free and bound metal ions, and low costs of ownership combined with quick results (within 10–15 minutes) make stripping voltammetry attractive for both stationary and mobile applications.


Recently, Metrohm has taken great efforts to combat the challenges related to the replacement of toxic Hg in the voltammetric determination of heavy metals. These efforts have resulted in the development of four new mercury-free sensors: scTRACE Gold electrode; 11L carbon screen-printed electrode; Glassy carbon electrode; Bismuth drop electrode.


By utilising these sensors with the 884 Professional VA or the 946 Portable VA Analyser from Metrohm, a total amount of 16 heavy metals can be determined with high selectivity and reproducibility of results with detection limits in the µg/L or ng/L range.


View the video: ilmt.co/PL/NZxb More information online: ilmt.co/PL/67lo and ilmt.co/PL/q1M7


Water Quality Pocket Testers as Accurate as Lab


Myron L® offers a variety of ULTRAPEN™ pocket testers, each featuring simultaneous measurement of Temperature and one critical parameter: PT1 and PTBT1 measure Conductivity, TDS, and Salinity; PT2 and PTBT2 measure pH; PT3 and PTBT3 measure ORP; PT4 and PTBT4 measure Free Chlorine Equivalent (FCE); PT5 and PTBT5 measure Dissolved Oxygen (DO); PT6 and PTBT6 measure Nitrate.


PT1 and PTBT1 instruments are engineered with a proprietary conductivity cell that delivers accuracy of ±1% of reading and ±0.2% of reading at calibration point.


PT2 and PTBT2 instruments employ a proprietary sensor with a large KCl reservoir for extended life. The user can choose to perform a 1-, 2-, or 3-point calibration. Accuracy is ±.01 pH.


PT3 and PTBT3 proprietary sensors are constructed of a 99.9% pure platinium electrode. There are 3 calibration options with automatic solution recognition. Measurement accuracy is ±10mV.


PT4 and PTBT4 determine the chemical activity of a solution without the hassle and subjectivity of colorimetric and test-strip methods. These instruments feature a proprietary sensor and accuracy of up to ±0.3 ppm FCE™.


PT5 and PTBT5 instruments are accurate to ± 2% of reading with 3 calibration methods: Water Saturated Air; Air Saturated Water; and 0 ppm DO. Readings are adjustable for altitude and salinity and display in concentration, % saturation, or both.


PT6 and PTBT6 measurement method is compatible with EPA Approved Standard Method 4500-NO3— D. The user can select either a 1- or 2-point calibration option and choose from one of 4 standard solutions depending on the application. Readings display as Nitrate, Nitrogen, or mV.


pH, ORP, FCE, DO, and Nitrate sensors are all user replaceable.


Original PT Series instruments feature one-button programmability, measurements, and calibration while the new PTBT Series pairs with most Android™ or iPhone® Bluetooth® enabled devices allowing the user to control settings, measurements, calibrations, and data reporting tools from the PTBTX2™ mobile application. Later, the user can email data in .csv, .xls, .xlsx, or Myron L Company’s proprietary encrypted format, .mlcx, compatible with Guardian2 software.


All ULTRAPENS are compact, lightweight, dust-tight, and waterproof with fully encapsulated electronics and bodies of rugged aircraft aluminium. More information online: ilmt.co/PL/ABaB


59415pr@reply-direct.com Xprep C-IC Ready for the Future of Rapid Trace PFAS Screening


The analysis of polyfluoroalkyl substances (PFAS) is a well-discussed topic in today’s environmental market. Due to concerns about the effect on human health and environmental risks, measurements of PFAS concentrations in a wide variety of matrices are conducted. These studies aim to get a better insight into the effects of PFAS substances.


To underline the importance of this subject, a proposal to restrict the use of per- and polyfluoroalkyl substances (PFAS) was submitted in January 2023 to the ECHA by several European countries. This proposal aims to ultimately ban the use of PFAS substances.


Traditional PFAS analytical methods are focused on the speciation of the individual PFAS components with expensive separation techniques. Currently, thousands of PFAS components have been produced and identified for monitoring, which makes the analyses for these components more and more complex.


Due to this, there is a growing request for a standardised, fast and reliable PFAS screening method to optimise the sample throughput and reduce resources. TE Instruments’ solution for PFAS screening is the Xprep C-IC, designed to determine the total amount of PFAS components in aqueous matrices at ultra-low trace levels.


The determination of AOF (Adsorbable Organic Fluorines) is based on the same principle as AOX (Adsorbable Organic Halogens) analyses: A generally accepted and standardised technique used for decades in environmental laboratories for the monitoring of the levels of organic halides (Chlorine/Bromine/Iodine) in aqueous matrices. Where a sample is combusted, conditioned, and quantified by means of coulometric titration. For the analyses of AOF, the quantification step is performed by the use of an Ion Chromatograph (IC).


TE Instruments developed a fully automated, extremely compact sample preparation system covering oxidative pyrohydrolytic combustion, fraction collection, and sample injection towards the IC. The Xprep C-IC can introduce samples both via optimised direct injection (liquids module) and conventional boat-inlet (boat module) into a horizontal furnace. This automated sample-prep solution reduces the complexity of sample transfer and significantly improves user convenience.


A unique feature of the Xprep C-IC setup is the optional usage of a ceramic insert in the furnace combustion tube. While standard AOX analysis focuses on standard halides, the analysis of PFAS is mainly aimed at the analysis of elemental Fluoride. This is where the power of the ceramic insert comes into its place. In a standard situation, Fluoride attacks quartz glass and may thus create a defective combustion tube over time. With the usage of the ceramic insert, a protective layer protects the furnace tube quartz material resulting in a far longer lifetime compared to a standard quartz glass setup.


More information online: ilmt.co/PL/5qbm 59680pr@reply-direct.com 59977pr@reply-direct.com


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