標準號：DIN EN ISO 6978-2-2005
中文標準名稱：天然氣.汞的測定.第2部分:用金/鉑合金混汞法對汞的采樣
英文標準名稱：Natural gas - Determination of mercury - Part 2: Sampling of mercury by amalgamation on gold/platinum alloy (ISO 6978-2:2003);English version of DIN EN ISO 6978-2
標準類型：E24
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：E24
國際標準分類號：75.060
引用標準：ISO 10715;ISO 14532;Guide to the expression of uncertainty in measurement (GUM),BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML
適用范圍：This part of ISO 6978 specifies a method for the determination of total mercury content of pipeline qualitynatural gas using a sampling method by amalgamation on gold/platinum (Au/Pt) alloy thread. This method isapplicable to the sampling of raw natural gas when no condensation is present. At atmospheric pressure, thismethod is suitable for the determination of mercury content within the range of 0,01 iJg/m3 to 100 iJg/m3 innatural gas samples. At higher pressures (up to 8 MPa), this sampling method is suitable for the determinationof mercury contents within the range of 0,001 iJg/m3 to 1 IJg/m3. The collected mercury is determined bymeasuring 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 bychemisorption on iodine-impregnated silica gel for the working range of 0,1 pglm3 to 5 000 pg/m3 for sampling atpressures up to 40 MPa.