标准摘要
[中文适用范围]： ISO 6978 的本部分规定了采用金/铂 (Au/Pt) 合金丝混汞取样法测定管道优质天然气总汞含量的方法。 本方法适用于无冷凝情况下的原天然气取样。 在大气压下，该方法适用于测定天然气样品中0.01μg/m至100μg/m范围内的汞含量。 在较高压力（最高 8 MPa）下，该采样方法适用于测定 0.001 μg/m 至 1 μg/m 范围内的汞含量。 通过测量汞蒸气在 253.7 nm 处的吸光度或荧光来确定收集到的汞。 注：ISO 6978-1 给出了适用于通过碘浸渍硅胶化学吸附测定天然气中汞含量的取样方法，工作范围为 0.1 μg/m 至 5 000 μg/m，取样压力高达40兆帕。 [外文原描述]： 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 /m 3 to 100 micrograms/m 3 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/m 3 to 1 microgram/m 3 . The collected mercury is determined by measuring the absorbance or fluorescence of mercury vapour at 253,7 nm.
英文名称Natural gas — Determination of mercury — Part 2: Sampling of mercury by amalgamation on gold/platinum alloy