formaldehyde

This study explored the reduction effect of indoor pollutants by the kinds of plant. The effect of reducingthe concentration of air contaminants by three species of plants was studied in a full-scale mock-upmodel. Aglaonema brevispathum, Pachira aquatica and Ficus benjamiana were used. Their positionsand amount were controlled. Field measurements were performed in models where the plants wereplaced and were not. The dimensions of the two models were equal.

To reduce the concentration of volatile organic compounds (VOCs) and formaldehyde emitted frombuilding materials and furnishings, it has been suggested that new buildings undergo a bake-out.According to the existing studies [3, 4], ventilation during a bake-out is believed to be essential forreducing the concentration of indoor air pollutants. For a practical use of bake-out, several ventilationstrategies such as natural and mechanical ventilation can be considered.

In approach to alleviating the problems causing ‘sick building syndrome’, many types of indoor air pollution removal products have been developed. In the various performance evaluation methods for these removal products, the pollutant constant-emission te

Formaldehyde has been widely used as a disinfectant and preservative in medical fields. Medicalstudents during their dissection course are exposed to formaldehyde, whose exposure is recentlyconsidered to be one of the causes of multiple chemical sensitivity. At first, we evaluated formaldehydeexposures that occurred in the gross anatomy laboratory with a general ventilation system.Formaldehyde in air was sampled by an active 2,4-dinitrophenylhydrazine (DNPH)-silica gel cartridge,extracted with acetonitrile and analyzed with a high performance liquid chromatography (HPLC).

It is well known that volatile organic compound (VOC) emissions from construction materials and officeappliance occasionally have influence on human health. It is a social request that manufacturersreduce VOC emissions from their products. To measure emissions from materials, a high-precisionchamber is required that can control environmental conditions such as ventilation, temperature,humidity, air flow, and VOC concentrations.

In recent years, volatile organic compounds have caused chemical sensitivity by increasing indoor airpollutant concentrations. In order to solve the problem, Ministry of Health, Labour and Welfare ofJapanese Government established the guideline values for indoor air concentrations for 13 compounds,such as formaldehyde, acetaldehyde, toluene and so on.

The paper presents experiment results of emission rates of HCHO from Medium DensityFiberboard (MDF, JIS grade E2) using three different test chambers. In this study, a full-scale stainless steel test chamber (19.68m3), a boundary layer type small test chamber (0.4m3), and a field and laboratory emission cell (FLEC, 3.510-5m3) were used. The coefficient of air change performance within the three test chambers was examined by CFD analysis. The convective mass transfer coefficient of HCHO from MDF was computed by CFD and the emission experiment.

This paper reports the effect of adsorptive building materials in reducing formaldehyde inindoor air. Although some studies have reported that adsorptive building materials are effective inreducing concentrations in chamber experiments, there are few studies which are carried out in actual room. In this paper we examine the reduction effect of changing the surface area of the adsorptive material in a room and the most effective arrangement of the material. We confirmed that the reduction effect is not always proportional to the adsorption surface area.

Field investigations have been conducted for that study in 5 office buildings of Taiwan to assess the risk of formaldehyde exposure for general population.This study demonstrates that the level of formaldehyde emitted from building materials can be affected by climatic conditions such as temperature and relative humidity. Consumers must be protected from exposure and it is urgent to help the industry to develop low emission materials in that part of the world.

This paper discusses research conducted to determine the status of indoor air chemicalpollution caused by formaldehyde in government offices in 2001. This research involvedmeasurements of formaldehyde concentration and questionnaires on the office rooms inapproximately 300 buildings.