1.3.1 Sulfuric Acid, the controlled condensation method for H2SO4 was originally propsed by Knol (2). The method was further developed and studied by Goksoyr and Ross (3) and others (4-5).
These studies indicated a 98% collection efficiency for H2SO4 in the condenser and frit for H2SO4 passing the filter. More recent studies show that 95+_ 6% of the H2SO4 entering the probe is eventually recovered from the condenser (6). In experiments with a filter preloaded with an amount of fly ash equivalent to a mass concentration of 1300 mg/m3 in the stack gas, the recovery of H2SO4 from the condenser at the 40 mg/m3 (10 ppm) level was 80-85%. The user should be aware that the collection efficiency may be very significantly affected if parameters such as temperature, sampling rate, etc. are altered from those recommended (7).