DIN EN ISO 6978-1-2005 天然气.汞的测定.第1部分:用碘化学吸附法对汞的采样

标准号：DIN EN ISO 6978-1-2005
中文标准名称：天然气.汞的测定.第1部分:用碘化学吸附法对汞的采样
英文标准名称：Natural gas - Determination of mercury - Part 1: Sampling of mercury by chemisorption on iodine (ISO 6978-1:2003); English version of DIN EN ISO 6978-1
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 6570;ISO 10715;ISO 14111;ISO 14532;Guide to the exzpression of uncertainty in measurement(GUM),BIPM,IEC,IFCC,ISO,IUPAC,IUPAP,OIML AISI Steel Code
适用范围：This part of ISO 6978 specifies a method for the determination of total mercury content in natural gas using asampling method at pressures up to 40 MPa by chemisorption on iodine-impregnated silica gel. This samplingmethod is suitable for the determination of mercury contents within the range of 0,1 μg/m3 to 5 000 μg/m3 innatural gas. This method is applicable to sampled gas volumes containing less than 20 mg hydrogen sulfide(absolute content) and less than a total liquid hydrocarbon condensate of 10 g/m3 under the samplingconditions. The collected mercury is determined by measuring the absorbance or fluorescence of mercuryvapour at 253,7 nm.NOTE ISO 6978-2 gives a sampling method suitable for the determination of mercury content of pipeline natural gasby amalgamation of mercury on gold/platinum alloy thread at atmospheric pressure for the range of mercury from0,01 μg/m3 to 100 μg/m3 and for sampling at high pressure (up to 8 MPa) from 0,001 μg/m3 to 1 μg/m3.