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Heritage Science
Fig. 1 | Heritage Science

Fig. 1

From: Simultaneous measurement of nitrous acid, nitric acid, and nitrogen dioxide by means of a novel multipollutant diffusive sampler in libraries and archives

Fig. 1

Exploded scheme of the multipollutant sampler. 1 Plastic cap (before and after exposition) or air barrier (during exposition), 2 Ring, 3 Polyethylene holder of absorbing pad impregnated with NaCl (HNO3 sampling), 4 Polyethylene holder of absorbing pad impregnated with Na2CO3 (HONO sampling), 5 Polyethylene holder of absorbing pad impregnated with Na2CO3 (interference of HONO and NO2), 6 Carbon Filter (NO2 sampling), 7, 8, 9 Plastic spacer, 10 Body of the sampler, 11 Absorbing pad (containing Na2CO3 or NaCl). Geometric features A cross sectional area (330 mm2), R maximum length of the plastic support (10 mm), r plastic support radius (6.5 mm), a diffusive path to NaCl impregnated filter (4.5 mm), b diffusive path to first Na2CO3 impregnated filter (11.3 mm), c diffusive path to second Na2CO3 impregnated filter (17.1 mm), d diffusive path to impregnated carbon filter (24.0 mm)

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