This part of ISO 6978 specifies a method for the determination of total mercury content in natural gas using asampling method at pressures up to 40 MPa by chemisorption on iodine-impregnated silica gel.This samplingmethod is suitable for the determination of mercury contents within the range of 0,1 μg/m3 to 5 000 μg/m3 innatural gas.This method is applicable to sampled gas volumes containing less than 20 mg hydrogen sulfide(absolute content) and less than a total liquid hydrocarbon condensate of 10 g/m3 under the samplingconditions. The collected mercury is determined by measuring the absorbance or fluorescence of mercuryvapour at 253,7 nm.
EN ISO 6978-1:2005 history
2005EN ISO 6978-1:2005 Natural gas - Determination of mercury - Part 1: Sampling of mercury by chemisorption on iodine (ISO 6978-1:2003 )