Method for calibrating mercury online measurement system accuracy and filter impact factor

The invention discloses a method for calibrating mercury on-line measurement system accuracy and filter influence factors, and the method comprises an elemental mercury filter calibration method: S1: step S101: generating standard gas with the concentration being the calibration concentration by a built-in elemental mercury generator, introducing the standard gas into a filter, and filtering to obtain a plurality of Hg0 readings c1; s102, the standard gas is not introduced into the filter to be filtered, and a plurality of Hg < 0 > readings c2 are obtained; s103, the adsorption rate of the zero-valent mercury filter is calculated, and if the adsorption rate of the zero-valent mercury filter is larger than a set maximum threshold value, it is judged that dust is accumulated on the surface of the filter, and dust removal needs to be conducted; and S104, calculating the relative error before the zero-valent mercury filter, and checking the abnormality of a built-in elemental mercury generator, a sampling unit or