Two methods are specified: method A for higher mercury content (> 0,5 µg/m3) based on sampling at atmospheric pressure, absorption in potassium permangante solution, reduction of mercury ions, analysis by flameless atomic absorption spectrometry; method B for lower mercury content (10- 3 µg/m3 to 1 µg/m3) based on sampling at atmospheric or higher pressure, adsorption on silver/gold, desorption, analysis by flameless atomic absorption spectrometry.
Số hiệu tiêu chuẩn
ISO 6978
Tên tiêu chuẩn
Natural gas; determination of mercury
Ngày phát hành
1992-09-00
Tiêu chuẩn tương đương
BS 7678 (1993-08-15), IDT * GB/T 16781.2 (1997), NEQ * STN 38 5580 (1995-08-01), MOD * CSN 38 5580 (1994-02-01), NEQ
Tiêu chuẩn liên quan
ISO 641 (1975-09) * ISO 3696 (1987-04) * ISO 4793 (1980-10)
Thay thế cho
ISO/DIS 6978 (1988-12)
Từ khóa
Chemical analysis and testing * Determination of content * Gas analysis * Mercury * Natural gas
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ISO 6978