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
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
ISO 10715ISO 14532Guide 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 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.