One quarter of the quartz filter was cut off and analyzed using an element analyzer to determine the total carbon (TC) and elemental carbon (EC) content. Analysis conditions consisted of heating for 1.5 min with an oxidation tube temperature of 950 C and a reduction tube temperature of 600 C.
A total carbon detector was used to detect the CO2 content of carbon-containing particles carried by helium after heat treatment.
After the output signal value was converted and inputted into an integrator, the weight percentage of carbon to the sample was determined, thereby facilitating the measurement of TC and EC content