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Merck

Seasonal trends of atmospheric nitrogen dioxide and sulfur dioxide over North Santa Clara, Cuba.

Environmental monitoring and assessment (2012-12-05)
Daniellys Alejo, Mayra C Morales, Jorge B de la Torre, Ricardo Grau, László Bencs, René Van Grieken, Piet Van Espen, Dismey Sosa, Vladimir Nuñez
RESUMEN

Atmospheric nitrogen dioxide (NO2) and sulfur dioxide (SO2) levels were monitored simultaneously by means of Radiello passive samplers at six sites of Santa Clara city, Cuba, in the cold and the warm seasons in 2010. The dissolved ionic forms of NO2 and SO2 as nitrate and sulfite plus sulfate, respectively, were determined by means of ion chromatography. Analysis of NO2 as nitrite was also performed by UV-Vis spectrophotometry. For NO2, significant t tests show good agreement between the results of IC and UV-Vis methods. The NO2 and SO2 concentrations peaked in the cold season, while their minimum levels were experienced in the warm season. The pollutant levels do not exceed the maximum allowable limit of the Cuban Standard 39:1999, i.e., 40 μg/m(3) and 50 μg/m(3) for NO2 and SO2, respectively. The lowest pollutant concentrations obtained in the warm season can be attributed to an increase in their removal via precipitation (scavenging) while to the decreased traffic density and industrial emission during the summer holidays (e.g., July and August).

MATERIALES
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radiello Adsorbentes de cartucho, 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 Diffusive Bodies, white, configured for general use, pk of 20
radiello Adsorbentes de cartucho, for sampling Aldehydes, matrix SS net with 2,4-DNPH coated FLORISIL®, pk of 20
radiello Adsorbentes de cartucho, for sampling Ammonia (NH3), matrix microporous PE impregnated with phosphoric acid, pk of 20
radiello Diffusive Bodies, blue, configured for sampling light sensitive compounds, pk of 20
radiello Diffusive Bodies, yellow, configured for reduced sampling rates, pk of 20
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radiello Barcode Labels, pk of 198
radiello Vertical Adapter, threaded for standard use, pk of 20
radiello BTEX/VOC Starter Kit, CS2 Desorption
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radiello BTEX/VOC Starter Kit, Thermal Desorption
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radiello BTEX Calibration Kit (Thermal Desorption)
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radiello Aldehyde Calibration Standard, 50 μg/mL each component in acetonitrile, pkg of 10 mL
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radiello Replacement Mounting Strips, for use with Radiello Outdoor Shelter, pk of 100