Passam Ltd. products

Nitrogen dioxide is a nasty smelling important air pollutant in urban areas and cities. It contributes to the formation of smog and can severely impact human health if exceeding a certain concentration. Major sources of nitrogen dioxide are the burning of fossil fuels, motor vehicle exhaust, petrol and metal refining, electricity generation and other manufacturing industries. The passive samplers to measure nitrogen dioxide are based on the principle of the NO2 diffusion onto the absorbent triethanolamine. The collected NO2 is then determined spectrophotometrically by the well-established Saltzmann method. Being designed for running without power supply, the samplers are optimized to operate in challenging environments.

Ozone is a colorless and odorless gas. It is the main component of smog and the most widespread air pollutant. Ozone is not emitted directly into the air, but is formed by reactions in the presence of sunlight and heat. Ozone can easily be transported and therefore its health endangering occurrence is not bound to its specific sources.

Sulfur dioxide is noticeable component in the atmosphere as well as a major air pollutant. Exceeding a certain concentration, the gas has a significant impact upon human health, the habitat suitability for plants as well as for animal life. Emissions of sulfur dioxide is a precursor to acid rain and atmospheric particulates. The passive sampler is based on the principle of diffusion of sulfur dioxide molecules onto the absorbent made out of potassium carbonate and glycerin. The quantification is done by ion-chromatography. The samplers are composed of a polypropylene housing with an opening of 20 mm in diameter. To exclude wind and weather disturbances, a glass fiber membrane supported by a wire net is attached and set up in a especially designed protective suspension device.

Ammonia is a colorless, penetrating smelling corrosive pollutant. The main sources of NH₃ are natural processes as decay of organic matter or from excreta. Man made sources are the use of fertilizers, waste disposal or industrial processes. Besides the unpleasant odour, high concentration of ammonia is severely harming the vegetation. The passive sampler collects gaseous NH₃ by absorption on phosphoric acid. The amount of NH₃ is determined spectrophotometrically by the indophenol method. The sampler is composed of a polypropylene housing with an opening of 20 mm in diameter. To exclude wind and weather disturbances, a glass fibre membrane supported by a wire net is attached and set up in a protective shelter. The sampler is placed in a specially designed shelter to protect it from weather conditions during its exposure.

Carbon monoxide is a temporary pollutant especially in urban areas and cities. It is colorless, odorless, tasteless and toxic if exceeding a certain concentration. Large CO pollution events can be observed over cities, mainly caused through combustion engines and fuels.

Atmospheric particulate matter (PM) or particulates are complex microscopic solid or liquid matter suspended in the atmosphere. Such particulates can have severe impacts on climate and precipitation that adversely affect human health.

Hydrogen sulfides are eventually toxic pollutants in industrial and urban areas mainly emitted by geothermal or biogenic sources. The gas is colorless and characterized by a foul odour. Large H₂S concentrations are found close by petroleum refineries, coke ovens, paper mills, tanneries or sewerages. The passive sampler to measure H₂S is based on the principle of the diffusion of H₂S molecules onto the cadmium sulphate absorbent. The attached glass fibre membrane supported by a wire net is eliminating weathering effects. The sampler is placed in a specially designed shelter to protect it from weather conditions during its exposure.

Nitrogen dioxide is a nasty smelling important air pollutant in urban areas and cities. It contributes to the formation of smog and can severely impact human health if exceeding a certain concentration. Major sources of nitrogen dioxide are the burning of fossil fuels, motor vehicle exhaust, petrol and metal refining, electricity generation and other manufacturing industries. The passive samplers to measure nitrogen dioxide are based on the principle of the NO2 diffusion onto the absorbent triethanolamine. The collected NO2 is then determined spectrophotometrically by the well-established Saltzmann method. Being designed for running without power supply, the samplers are optimized to operate in challenging environments.

Benzene is a colorless and highly flammable liquid characterized by a distinctive smell mainly emitted by vehicles and other combusting processes. Benzene quickly reacts with other chemical in the air and is removed within a few days of release. Inhalation of extremely high levels of benzene as well as long time exposure to lower benzene concentration can cause sever health damages. The amounts of benzene released naturally are insignificant in comparison by those emitted by human’s activity.

Nitrogen dioxide is a nasty smelling important air pollutant in urban areas and cities. It contributes to the formation of smog and can severely impact human health if exceeding a certain concentration. Major sources of nitrogen dioxide are the burning of fossil fuels, motor vehicle exhaust, petrol and metal refining, electricity generation and other manufacturing industries. The passive samplers to measure nitrogen dioxide are based on the principle of the NO2 diffusion onto the absorbent triethanolamine. The collected NO2 is then determined spectrophotometrically by the well-established Saltzmann method. Being designed for running without power supply, the samplers are optimized to operate in challenging environments.