This document specifies a method for the determination of the concentration of hydrochloric acid (HCl) and hydrofluoric acid (HF) in biomethane, after absorption on an alkali-impregnated quartz fibre filtre or in a sorbent trap, by ion chromatography (IC) with conductimetric detection. The method is applicable to biomethane for concentration levels for HCl from 0,07 mg/m3 to 35 mg/m3 and for HF from 0,07 mg/m3 to 20 mg/m3. Unless stated otherwise, all concentrations in this document are given under standard reference conditions (see ISO 13443). Other conditions can be applied. This method is also applicable to biogas. This method is intended to support conformity assessment of biomethane and biogas according to specifications, such as the EN 16723 series.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Principle
6 Reagents and consumables
6.1 General
6.2 Water
6.3 Aqueous solutions
6.4 Chloride and fluoride stock standard solutions
6.5 Chloride and fluoride standard solutions
6.6 Chloride and fluoride calibration solutions
6.7 Blank
6.8 Eluents
6.9 Quartz filters
6.10 Syringe filters
6.11 Sorbent tubes
7 Apparatus
7.1 General
7.2 Ion chromatography system
7.3 Quality requirements for the separator column
8 Sampling and sample pre-treatment
8.1 General
8.2 Sampling equipment
8.3 Sampling
8.4 Sample pre-treatment
9 Procedure
9.1 General
9.2 Calibration
9.3 Measurement
10 Calculation
11 Expression of results
12 Performance characteristics
12.1 Calibration check
12.2 Performance data
13 Test report
Annex A Characteristics of the method (informative)
Annex B Dynamic generation of HCl and HF (informative)
ISO 10304-1:2007 Water quality — Determination of dissolved anions by liquid chromatography of ions — Part 1: Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate
ISO 14532:2014 Natural gas — Vocabulary
ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
ISO 10304-1:2007 Water quality — Determination of dissolved anions by liquid chromatography of ions — Part 1: Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate
ISO 14532:2014 Natural gas — Vocabulary
ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
ISO 6974-1:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 1: General guidelines and calculation of composition
ISO 6974-2:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 2: Uncertainty calculations
ISO 6974-3:2018 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 3: Precision and bias
ISO 6976:2016 Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition