Powered Air Purifying Respirators (PAPRs).Air Carts, Compressors & Air Filtration Systems.Securiplex High Pressure Water Mist Systems.Notifier® Fire Detection & Control Panels.National Foam Fire Suppression Products.Firetrace Automatic Fire Suppression Systems.Equiptec Height Adjustable Work Platforms.If you are having difficulty reaching us by phone, please submit your requests via email to Our customer service team will respond promptly. 1 kmole SO 4 2- is 2 keq, (because of the double - charge) and 1 keq SO4= is 32/2 or 16 kg S.Due to the higher than normal call volume, we are experiencing some technical difficulties with our phone systems. The 'equivalent' refers to the ionic charge on an ion. The full process is to convert kg to kmoles, then kmoles to keq. For sulphur, the prevalent ion is sulphate SO 4 2-, which has a double charge (valency). For example NH 4 + or NO 3 - have a valency of 1. When converting acidifying compounds the valency is important and is connected with the charge on the ion. Kg ha -1 year -1 to kiloequivalents ha -1 year -1: Their concentrations are normally expressed only in µg m -3 sulphate, nitrate) are present as particles in theĪir and the concept of a volume mixing ratio of gases is not obviously applicable. Molecules and has a partial pressure of one millionth of the atmosphericĮquates to a different air concentration in µg m -3įor this reason air concentrations of NO X are normally expressed as µg NO X-NO 2 Of polluted air, it is also 1 molecule per 10 -6 As a consequence of the gas laws, a gas presentĪt a volume mixing ratio of 1 ppm is not only 1 cm 3 Upon temperature and pressure as these affect both the pollutant and theĪir to the same extent. Ideal gas behaviour is assumed and thus the concentration is not dependent Volume if segregated pure, to the volume of the air in which it is contained. This unit expressed the concentration of a pollutant as the ratio of its Volume mixing ratio: usually ppm - parts per million (10 -6) Units should, strictly speaking, specify the conditions at the time of sampling. Of a given parcel of air is dependent upon the temperature and pressureĪt the time of sampling, the pollutant concentration expressed in these Pollutant is expressed as a ratio to the volume of air. There are two systems of unit in common use for gaseous and particular pollutants: Mass per unit volume: usually µg -3.
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