Merck
  • Home
  • Search Results
  • Seasonal trends of atmospheric nitrogen dioxide and sulfur dioxide over North Santa Clara, Cuba.

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
ABSTRACT

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).

MATERIALS
Product Number
Brand
Product Description

radiello Hydrogen Sulfide Starter Kit
radiello Empty Storage Tubes, polypropylene (with stopper), volume 12 mL, pk of 100
radiello On-Field Thermometer, Includes one standard Radiello vertical adapter (RAD122) for each thermometer, configured for standard use, pk of 3
radiello BTEX/VOC Starter Kit, CS2 Desorption
radiello Filtration Kit, pk of 20
Supelco
radiello VOC Calibration Kit (Workplace Environment)
radiello Diffusive Bodies, white, configured for general use, pk of 20
radiello BTEX/VOC Starter Kit, Thermal Desorption
radiello On-Field Thermometer, Reader, pk of 1
radiello Diffusive Bodies, blue, configured for sampling light sensitive compounds, pk of 20
Supelco
radiello Aldehyde Calibration Standard, 50 μg/mL each component in acetonitrile, pkg of 10 mL
Supelco
radiello Methylene Blue Calibration Standard for H2S (Hydrogen Sulfide), pkg of 100 mL
radiello 1,3-Butadiene Starter Kit, Thermal Desorption, 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 Empty Storage Tubes, glass (with stopper), volume 2.8 mL, pk of 100
Supelco
radiello BTEX Calibration Kit (CS2 Desorption)
Supelco
radiello BTEX Calibration Kit (Thermal Desorption)
radiello Clips, suspending Radiello triangular support plate, pk of 20
radiello Diffusive Bodies, yellow, configured for reduced sampling rates, pk of 20
radiello Diffusive Bodies, permeative, configured for anaesthetic gases and vapors, pk of 20
radiello Outdoor Shelter, pk of 10
radiello Cartridge Adsorbents, for sampling BTEX and VOCs (thermal desorption), matrix SS net (3 x 8 μm, 4.8 mm diam.), Carbograph, pk of 20
radiello Triangular Support Plate, pk of 20
radiello Replacement Mounting Strips, for use with Radiello Outdoor Shelter, pk of 100
radiello Vertical Adapter, threaded for standard use, pk of 20
radiello Cartridge Adsorbents, 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 Cartridge Adsorbents, for sampling Aldehydes, matrix SS net with 2,4-DNPH coated FLORISIL®, pk of 20
radiello Cartridge Adsorbents, for sampling Anaesthetic Gases/Vapors, matrix SS net with mix of mol sieve and activated charcoal (30-50 mesh), pk of 20
radiello Barcode Labels, pk of 198
radiello Anesthetic Gases and Vapor Sampler
radiello Cartridge Adsorbents, for sampling Ammonia (NH3), matrix microporous PE impregnated with phosphoric acid, pk of 20