ISO 6978-1:20 03规定了一种在高达40 MPa的压力下通过在碘浸渍硅胶上化学吸附的取样方法测定天然气中总汞含量的方法。该采样方法适用于天然气中汞含量在0.1微克/立方米至5 000微克/立方米范围内的测定。本方法适用于取样条件下含硫化氢小于20mg、总液态烃凝析油小于10g/m3的取样气体体积。通过测量汞蒸气在253.7 nm处的吸光度或荧光来确定收集的汞。

ISO 6978-1:2003 specifies a method for the determination of total mercury content in natural gas using a sampling method at pressures up to 40 MPa by chemisorption on iodine impregnated silica gel. This sampling method is suitable for the determination of mercury contents within the range of 0,1 microgram/m³ to 5 000 micrograms/m³ in natural gas. This method is applicable to sampled gas volumes containing less than 20 mg hydrogen sulfide and less than a total liquid hydrocarbon condensate of 10 g/m³ under the sampling conditions. The collected mercury is determined by measuring the absorbance or fluorescence of mercury vapour at 253,7 nm.