BS 7678:1993
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Method for determination of mercury in natural gas
Hardcopy , PDF
English
15-08-1993
17-12-2003
Committees responsible
National foreword
Method
1 Scope
2 Normative references
3 Principle
4 Method A: Determination of mercury by sampling at
atmospheric pressure
5 Method B: Determination of mercury by sampling at
atmospheric or higher pressure
6 Precision
7 Test report
Table
1 Saturated concentration of mercury in air at
different temperatures
Figures
1 Method A: Assembly of sampling equipment
2 Method A: Assembly of analysing equipment
3 Method B: Silica tube
4 Method B: Assembly for making calibration standard
5 Method B: Calibration assembly
6 Method B: Assembly of sampling equipment at high
pressure
7 Method B: Assembly for stripping step
8 Method B: Assembly of analysing equipment
9 Method B: Assembly of sampling equipment at
atmospheric pressure
Specifies two methods for the determination of mercury, including dimethyl mercury, elemental mercury and diethyl mercury, in natural gas. Method A prescribes sampling at atmospheric pressure, using absorption in potassium permanganate solution followed by reduction of mercury ions and subsequent analysis by flameless atomic absorption spectrometry. Method B prescribes sampling at atmospheric or higher pressure using adsorption of mercury on silver/gold followed by desorption and subsequent analysis by flameless atomic absorption spectrometry.
| Committee |
PTI/15
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| ISO 6978:1992 | Identical |
| ISO 4793:1980 | Laboratory sintered (fritted) filters — Porosity grading, classification and designation |
| ISO 3696:1987 | Water for analytical laboratory use — Specification and test methods |
| ISO 641:1975 | Laboratory glassware — Interchangeable spherical ground joints |
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