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Water/Wastewater 9 MTBE and BTEX On-site Rapid Screening of Petroleum Contaminated Ground Water
MTBE and BTEX compounds were rapidly screened in petroleum contaminated ground water using solid phase microextraction (SPME) followed by on-site analysis with a GUARDION®-7 portable gas chromatograph- toroidal ion trap mass spectrometer (GC-TMS) from Torion Technologies (USA). The SPME-GC-TMS method can be used to effectively extract, concentrate, separate and detect both MTBE and BTEX quickly and reliably on-site for rapid decision making and cost savings.
The CUSTODION® SPME syringe, together with the GUARDION®-7 gas chromatograph-toroidal ion trap mass spectrometer (GC-TMS) can be used for rapid on-site sample extraction and analysis for sample screening and decision making. Following on-site sample analysis, informed decisions can be made regarding which samples should be sent to a laboratory for confirmatory analysis. In addition, on-site sample collection and extraction using SPME minimizes target analyte losses compared to traditional techniques that risk analyte loss during storage and transport.
The CUSTODION SPME sampling syringe consists of a 1cm fiber coated with a liquid polymer film, solid sorbent or a combination. The SPME fiber is housed in a durable syringe that can be operated with a single hand. Much like a retractable ball point pen, the push button trigger on top of the CUSTODION syringe allows the SPME fiber to be extended and retracted into and out of a protective metal sheath. The SPME fiber traps target analytes from air, headspace (solids or liquids), or direct sampling of liquids and dissolved solid samples.
The CUSTODION PDMS/DVB/CAR SPME syringe used for this application consists of a 1cm length of silica fiber coated with a combination of a liquid polymer film with polydimethylsiloxane (PDMS) and divinylbenzene (DVB) and carboxen (CAR) solid sorbent. Both MTBE and BTEX compounds were extracted directly from petroleum-contaminated water samples.
The attached figure shows the GC-TMS separation of MTBE and BTEX in a ground water sample. All of the compounds were detected and positively identified by the GUARDION-7 compound library. For compounds which co-elute, an on-board deconvolution algorithm was able to positively identify each component based on statistical treatment of the ion fragmentation data.
ULTRAPEN PT1 TM
Conductivity/TDS/Salinity Pen ULTRAPENTM
PT1 is Myron L’s groundbreaking new
Conductivity/TDS/Salinity tester. The PT1 pen features the accuray and stability of benchtop lab equipment with the convenience of a pen.
Constructed of durable aircraft aluminum, this pen is fully potted for extra protection with an easy to read LCD and one-button functions.
Unlike any other instrument in its class, the PT1 allows the user to select from 3 of the most commonly used solution standards: KCl, NaCl, and Myron L’s 442 proprietary standard for Natural WaterTM
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Chromatogram of BTEX screen in petroleum contaminated ground water, 10 s immersion using a PDMS/DVB/CAR SPME fiber. Compound identi- fication: (1) MTBE, (2) benzene, (3) toluene, (4) ethylbenzene, (5) xylenes.
SPME-GC-TMS is a useful method for on-site sample screening prior to transport for laboratory MTBE and BTEX analysis by GC-TMS. Water or solid samples can be screened using the GUARDION-7 GC-TMS for preliminary information on potential levels of contamination, if any. The CUSTODION SPME syringe and GUARDION-7 GC-TMS provide a fast, easy, accurate and reliable method for sample extraction and on-site analysis.
Reader Reply Card No. 29
Fast, Precise On-site Testing of Liquids
The compact Lovibond® infrared turbidity meter TurbiCheck from Tintometer (Germany) is designed to allow fast, precise on-site testing. The unit measures the scattered light at an angle of 90°, as stipulated in EN ISO 7027.
The wide measuring range from 0.01-1100 TE/F = NTU = FNU makes the instrument suitable for various applications, ranging from drinking water to waste water.
As infrared light is used for measurement purposes, the unit can be used to test both coloured and colourless liquids. The standards required for calibration of the unit are also supplied. A second adjustment mode allows alternative adjustment with user-defined turbidity standards.
Reader Reply Card No. Reader Reply Card No. 30
www.envirotech-online.com AET Annual Buyers’ Guide 2012 32
The PT1 is an indispensable instrument in the water quality professional’s toolkit.
Reader Reply Card No. 31
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