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The sampler collects NO2 by molecular diffusion
along an inert tube to an absorbent, in this case triethanolamine.
The sampler, which is shown in the following diagram, is composed
of a polypropylene housing with an opening of 20 mm diameter.
To reduce wind disturbance a teflon membrane is attached,
supported by a wire net. The collected NO2 is determined spectrophotometrically
by the Saltzmann method.
The samplers are placed in a special shelter
to protect them from rain.
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