该ISO 6978-2:2003规定了使用金/铂（Au/Pt）合金丝合并采样方法确定管道质量天然气总汞含量的方法。该方法适用于不存在冷凝时原始天然气的抽样。在大气压下，该方法适用于天然气样品中汞含量在0.01微克/立方米至100微克/立方米范围内的测定。在更高的压力（高达8MPa）的情况下，这种采样方法适用于在0.001毫克/立方米至1微克/立方米范围内的汞含量测定。通过测量253,7nm的汞蒸气的吸光度或荧光来测定收集的汞

This ISO 6978-2:2003 specifies a method for the determination of total mercury content of pipeline quality natural gas using a sampling method by amalgamation on gold/platinum (Au/Pt) alloy thread. This method is applicable to the sampling of raw natural gas when no condensation is present. At atmospheric pressure, this method is suitable for the determination of mercury content within the range of 0,01 microgram /m3 to 100 micrograms/m3 in natural gas samples. At higher pressures (up to 8 MPa), this sampling method is suitable for the determination of mercury contents within the range of 0,001 microgram/m3 to 1 microgram/m3. The collected mercury is determined by measuring the absorbance or fluorescence of mercury vapour at 253,7 nm.