Passam Ltd.

Ammonia Diffusive Sampler

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The diffusive sampler for ammonia collects gaseous ammonia by absorption on phosphoric acid. The amount of ammonia is determined spectrophotometrically by the indophenol method. The passive samplers are 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. To protect the sampler from weather influences, as well as minimising wind disturbance, a protective shelter has to be used.

Time series of a comparison of a continuous NH3 analyser and diffusion tube of ammonia [1].

Specifications

Samplingrate: 31.5 ml/min at 20oC

Working range: 0.5 — 20 µg/m3

Sampling time: 2— 4 weeks

Detection limit: 0.3 µg/m3 for one month
External influences:
wind speed: Influence of wind speed < 10% up to 4.5 m/sec using protection shelters
temperature: no influence between 5 to 40oC
humidity: no influence between 20 to 80%

Storage:
before use: 6 months above citric acid
after exposure:  4 months

Cross sensitivity: Solid particulates of ammonia are not collected

Expanded uncertainty*: 24.8 % at concentration levels of 5 µg/m3

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