ISO 6978-1:2003 PDF

Scope: 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/m to 5 000 μg/m 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 10g/m 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/m to 100 μg/m and for sampling at high pressure (up to 8 MPa) from 0,001 μg/m to 1 μg/m.

ISO 6978-1:2003 Referenced Document

ISO 10715 Natural gas — Gas sampling*， 2022-10-04 Update
ISO 14111 Natural gas - Guidelines for traceability in analysis
ISO 14532 Natural gas - Vocabulary*， 2014-06-01 Update
ISO 6570 Natural gas - Determination of potential hydrocarbon liquid content - Gravimetric methods

2003 ISO 6978-1:2003 Natural gas - Determination of mercury - Part 1: Sampling of mercury by chemisorption on iodine