Envirotech Instruments Private Limited
Okhla Industrial Area, New Delhi, Delhi
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With the addition of Benzene in petrol, in place of a lead compound, Benzene and its derivatives are now an integral part of vehicular pollution and have become a matter of concern. Unfortunately a majority of these compounds are highly toxic and many have been reported to be carcinogenic. Organic compounds are also reported to be pre-cursers for Ozone formation and play a role in secondary formation of oxidants. As such air pollution monitoring networks are now beginning intensive efforts for monitoring of specific organic compounds such as Benzene, Toluene & Xylene and often a mixture of Total Non Methane Hydrocarbons.
The APM 856 Organic Vapour Sampler meets all important requirements for field measurements of gaseous organic pollutants in ambient air. It collects samples of organic compounds by adsorbing them on an activated charcoal column. The organics are then desorbed and analyzed via a gas chromatograph to estimate the actual concentration in ambient air.
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The APM 433 Gaseous Pollutants Sampler has been designed for monitoring Gaseous Pollutants like SO2, NO2, Cl2, H2S, O3, NH3 etc. in ambient air. The APM 433 is an independent stand-alone monitoring instrument (unlike our gaseous sampling attachments APM 411 and APM 411 TE that need to be paired with a dust sampler). A suction pump is also made an integral part of the sampler, besides a flow-meter, time totalizer and timer. Sampled air is bubbled through suitable reagents that absorb specific gaseous pollutants and the absorbing media analyzed as per standard wet chemical methods.
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The APM 411TE is designed as an attachment to operate with Envirotech’s Respirable Dust or High Volume Samplers and PM 2.5 samplers. When paired with an appropriate dust sampler, the APM 411 TE allows the user to collect gaseous pollutant samples (for monitoring SO2, NOx, NH3, Ozone, etc) as well as dust samples simultaneously.
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The Respirable Dust Sampler is essentially a particulate sampling system requiring a high flow-rate. Gaseous sampling (for NO2, SO2, CL2, H2S, etc) requires only a few LPM of air flow. All models of Envirotech Respirable Dust Samplers are provided with a suction port and mounting hardware to facilitate interface of the Gaseous Sampling Attachment APM 411.
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