標準號：BS EN ISO 6978-2-2003
中文標準名稱：天然氣.汞的測定.用碘/鉑合金混和法采樣汞
英文標準名稱：Natural gas - Determination of mercury - Sampling of mercury by amalgamation on gold/platinum alloy
標準類型：E24
發布日期：2003/12/17 12:00:00
實施日期：2003/12/17 12:00:00
中國標準分類號：E24
國際標準分類號：75.060
適用范圍：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 μg/m to 100 μg/m 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 μg/m to 1 μg/m. 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 μg/m to 5 000 μg/m for sampling at pressures up to 40 MPa.