BS EN ISO 6978-2-2003 天然气.汞的测定.用碘/铂合金混和法采样汞

标准号：BS EN ISO 6978-2-2003
中文标准名称：天然气.汞的测定.用碘/铂合金混和法采样汞
英文标准名称：Natural gas - Determination of mercury - Sampling of mercury by amalgamation on gold/platinum alloy
标准类型：E24
发布日期：2003/12/17 12:00:00
实施日期：2003/12/17 12:00:00
中国标准分类号：E24
国际标准分类号：75.060
适用范围：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.