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Merck

Laboratory and field validation of a combined NO2-SO2 Radiello passive sampler.

Journal of environmental monitoring : JEM (2007-10-31)
W Swaans, E Goelen, R De Fré, E Damen, P Van Avermaet, E Roekens, V Keppens
要旨

A combined NO2-SO2 Radiello radial-type diffusive sampler was validated under controlled laboratory conditions and compared with NO2-SO2 results of 3 other type of samplers in a field comparison at two locations Ghent-Mariakerke and Borgerhout in Flanders. Laboratory exposures at different temperatures (-5, 10 and 30 degrees C) and relative humidities (0, 50 and 80% RH) in combination with varying concentration levels and exposure times were carried out, with a focus on extreme conditions. Concentration level and exposure time were changed together following suppliers linear working range of samplers and assuring absolute amounts of compounds on the sampler corresponding to those of environmental levels. The average uptake rate for NO2 for 24 hour exposures at 10 degrees C and 50% RH and tested concentration levels (+/-73, 146 and 293 ppb NO2) was 0.076 +/- 0.011 ng ppb(-1) min(-1). Uptake rates during all experiments were lower than the uptake rate given in the instruction manual of the sampler. A significant effect of temperature and relative humidity on NO2 uptake rate was observed. The temperature effect from 10 to 30 degrees C corresponds to the temperature effect given by the supplier of the samplers. High relative humidity (70 to 80%) caused a strong non-reproducible decrease of uptake rate for NO2 at 24 hour experiments but this effect was not observed at longer exposures except for the tests at -5 degrees C. At the tested temperature below zero in combination with high relative humidity the sampler showed anomalous behaviour for NO2. The possible effect of concentration level and exposure time for NO2 needs further research. The average uptake rate for SO2 calculated from all exposures is 0.478 +/- 0.075 ng of sulfate ion each ppb min of SO2 and accords to suppliers uptake rate. No clear effects of temperature, relative humidity or concentration level/exposure time on the uptake rate for SO2 were found, partly due to the large scatter of results. Although NO2 accuracy of Radiello samplers was better during field campaigns than during laboratory validation, IVL and OGAWA samplers gave better results for NO2. In the field, IVL samplers showed best agreement with the continuous analyzers for both NO2 and SO2.

材料
製品番号
ブランド
製品内容

radiello カートリッジ吸収剤, for sampling BTEX and VOCs (CS2 Desorption), matrix SS net (100 mesh, 5.8 mm diam.), activated with activated charcoal (30-50 mesh), pk of 20
radiello Triangular Support Plate, pk of 20
radiello 拡散ボディー, white, configured for general use, pk of 20
radiello カートリッジ吸収剤, for sampling Aldehydes, matrix SS net with 2,4-DNPH coated FLORISIL®, pk of 20
radiello カートリッジ吸収剤, for sampling Ammonia (NH3), matrix microporous PE impregnated with phosphoric acid, pk of 20
radiello 拡散ボディー, blue, configured for sampling light sensitive compounds, pk of 20
radiello 拡散ボディー, yellow, configured for reduced sampling rates, pk of 20
radiello カートリッジ吸収剤, for sampling BTEX and VOCs (thermal desorption), matrix SS net (3 x 8 μm, 4.8 mm diam.), Carbograph, pk of 20
Supelco
radiello Methylene Blue Calibration Standard for H2S (Hydrogen Sulfide), pkg of 100 mL
radiello Outdoor Shelter, pk of 10
radiello Barcode Labels, pk of 198
radiello Vertical Adapter, threaded for standard use, pk of 20
radiello BTEX/VOCスターターキット、CS2脱離
radiello Filtration Kit, pk of 20
radiello BTEX/VOCスターターキット、熱脱離
Supelco
radiello BTEX Calibration Kit (Thermal Desorption)
radiello スターターキット
radiello On-Field Thermometer(フィールド用温度計), Includes one standard Radiello vertical adapter (RAD122) for each thermometer, configured for standard use, pk of 3
radiello麻酔ガス・蒸気サンプラー
radiello Empty Storage Tubes, glass (with stopper), volume 2.8 mL, pk of 100
radiello カートリッジ吸収剤, for sampling Anaesthetic Gases/Vapors, matrix SS net with mix of mol sieve and activated charcoal (30-50 mesh), pk of 20
radiello Empty Storage Tubes, polypropylene (with stopper), volume 12 mL, pk of 100
Supelco
radiello BTEX Calibration Kit (CS2 Desorption)
radiello Clips, suspending Radiello triangular support plate, pk of 20
radiello 1,3-ブタジエンスターターキット、昇温脱離, pkg of 1 kit (2 RAD141 adsorbing cartridges and barcode labels, 1 RAD1202 yellow diffusive body, 1 RAD121 triangular support plate, 1 instruction sheet)
radiello 拡散ボディー, permeative, configured for anaesthetic gases and vapors, pk of 20
radiello On-Field Thermometer(フィールド用温度計), Reader, pk of 1
radiello Replacement Mounting Strips, for use with Radiello Outdoor Shelter, pk of 100