Mass Spectrometry & Spectroscopy 31


Major Benefits of Laser Gas Detectors/TDLS Technology


Laser gas detection, based on Tunable Diode Laser Spectroscopy or TDLS, provides a solution to


many challenges in environmental gas monitoring and process control. Axetris uses


proprietary technology- enhanced TDLS for gas detection. A 0.05 nm narrow bandwidth diode laser beam is


scanned across an absorption band


of the target gas, thus performing a high-resolution near infrared absorption measurement.


The TDLS technology offers unique advantages, such as: precise optical, contactless measurements; excellent target gas selectivity; sub ppm-level detectivity for gases such as CH4 CO2


, NH3 , HCl, H2 O and


; low cost of ownership; high stability, reliability and availability in the field (no regular replacements/calibration needed); long lifetime (10+ years).


The LGD is a cost effective solution for OEM integrators active in emission control and environmental monitoring. It allows for simple integration due to its self-contained and standalone system design. It also offers hot-gas measurements up to 220°C. The LGD covers further gas monitoring & detection applications in combustion control, greenhouse gas monitoring (CH4


), safety and many more. 42766pr@reply-direct.com MBH ANALYTICAL LTD


CERTIFIED REFERENCE MATERIALS


OES – XRF – AA – ICP FOR ALL YOUR


CERTIFIED REFERENCE MATERIALS CONTACT


MBH


CATALOGUE AVAILABLE WEBSITE www.mbh.co.uk


A BS EN ISO 9001 REGISTERED COMPANY - CERTIFICATE NO. 0524


MBH ANALYTICAL LIMITED Holland House, Queens Road, BARNET, Herts EN5 4DJ, England


Tel : (44) 020 8441 2024 Fax : (44) 020 8449 0810 E-mail: info@mbh.co.uk


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New Method to Analyse Haloacetic Acids, Bromate and Dalapon is 50% Faster than Current USEPA Method


Wu et. al. present a new method to analyse nine haloacetic acids (HAAs), bromate, and dalapon plus four potentially more toxic iodinated HAAs in natural waters by coupling ion chromatography with tandem mass spectrometry (IC-MS/MS). The new method is 50% faster than the current USEPA method 557 including more compounds and achieving sub-µg/L level detection limits for all 15 target analytes.


HAAs are one of the most commonly detected disinfection by-products in US water utilities. Some of them are regulated by the USEPA and have been classified as potentially carcinogenic. HAAs have traditionally been analysed by GC methods, which require derivatisation and sample extraction, which are laborious, time-consuming, and can have a negative effect on reproducibility.


The method presented in the paper by Wu et. al. overcomes these disadvantage by coupling ion chromatography with tandem mass spectrometry. The method was applied to investigate concentrations of 13 HAAs, bromate, and dalapon in untreated, chlorinated and chloraminated


groundwater and surface water samples. The method provides an easy approach to assess the health risk of HAAs, especially the highly toxic iodinated HAAs. For more information, contact Metrohm.


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