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
ISO 6570ISO 10715ISO 14111ISO 14532Guide 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 a
sampling method at pressures up to 40 MPa by chemisorption on iodine-impregnated silica gel. This sampling
method is suitable for the determination of mercury contents within the range of 0,1 μg/m3 to 5 000 μg/m3 in
natural 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 sampling
conditions. The collected mercury is determined by measuring the absorbance or fluorescence of mercury
vapour at 253,7 nm.
NOTE ISO 6978-2 gives a sampling method suitable for the determination of mercury content of pipeline natural gas
by amalgamation of mercury on gold/platinum alloy thread at atmospheric pressure for the range of mercury from
0,01 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.