This part of ISO 6978 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 iJg/m3 to 100 iJg/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 iJg/m3 to 1 IJg/m3. The collected mercury is determined by measuring the absorbance or fluorescence of mercury vapour at 253,7 nm. NOTE ISO 6978-1 gives a sampling method suitable for the determination of mercury contents in natural gas by chemisorption on iodine-impregnated silica gel for the working range of 0,1 pglm3 to 5 000 pg/m3 for sampling at pressures up to 40 MPa.
DIN EN ISO 6978-2-2005由德国标准化学会 DE-DIN 发布于 2005-09。
DIN EN ISO 6978-2-2005 在中国标准分类中归属于: E24 天然气,在国际标准分类中归属于: 75.060 天然气。
* 在 DIN EN ISO 6978-2-2005 发布之后有更新,请注意新发布标准的变化。
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