DIN EN ISO 6978-2-2005 天然气.汞的测定.第2部分:用金/铂合金混汞法对汞的采样

标准号：DIN EN ISO 6978-2-2005
中文标准名称：天然气.汞的测定.第2部分:用金/铂合金混汞法对汞的采样
英文标准名称：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
标准类型：E24
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：E24
国际标准分类号：75.060
引用标准：ISO 10715;ISO 14532;Guide to the expression of uncertainty in measurement (GUM),BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML
适用范围：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.