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ISO 22515:2021 Water quality - Iron-55 - Test method using liquid scintillation counting >
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ISO 22515:2021 Water quality - Iron-55 - Test method using liquid scintillation counting, 2021
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions, symbols, and units
- 3.1 General use
- 3.2 55Fe and 59Fe specific terms
- 4 Principle
- 5 Reagents
- 5.1 Standard solutions
- 5.1.1 Iron-55 and 59Fe standards
- 5.1.2 Stable iron standards
- 5.1.3 Chemical Quenching agent
- 5.1.4 Colour Quenching agent
- 5.2 Holdback carrier
- 5.3 Water
- 5.4 Specific reagents for chemical separation
- 5.4.1 Stable iron carrier solution
- 5.4.2 Ammonium hydroxide solution, c(NH4OH) = 4 mol l-1
- 5.4.3 Nitric acid solution, c(HNO3) = 7,2 mol l-1
- 5.4.4 Ammonium hydroxide solution, c(NH4OH) = 6 mol l-1
- 5.4.5 Hydrochloric acid, c(HCl) = 9 mol l-1
- 5.4.6 Hydrochloric acid, c(HCl) = 6 mol l-1
- 5.4.7 Hydrochloric acid, c(HCl) = 4 mol l-1
- 5.4.8 Hydrochloric acid, c(HCl) = 0,01 mol l-1
- 5.4.9 Nitric acid solution, c(HNO3) = 8 mol l-1
- 5.4.10 Nitric acid solution, c(HNO3) = 2 mol l-1
- 5.4.11 Sodium hydrogen phosphate, c(Na2HPO4) = 0,5 mol l-1
- 5.4.12 Hydrochloric acid, c(HCl) = 1 mol l-1
- 6 Equipment
- 6.1 Laboratory equipment for direct evaporation
- 6.2 Liquid scintillation vials
- 6.3 Measurement equipment: Liquid scintillation counter
- 7 Sampling and sample preparation
- 8 Liquid scintillation set up and calibration
- 8.1 Region setting
- 8.2 Background
- 8.3 Calibration
- 9 Procedure
- 9.1 Preliminary
- 9.1.1 Stable iron content [11]
- 9.1.2 Iron separation
- 9.2 Iron-55 source preparation
- 10 Quality control
- 11 Expression of results
- 11.1 Iron recovery
- 11.2 Detection efficiencies
- 11.2.1 55Fe detection efficiency
- 11.2.2 59Fe detection efficiency
- 11.3 Iron-55 activity
- 11.4 55Fe decision threshold and detection limit
- 11.5 Limits of the coverage intervals
- 11.5.1 Limits of the probabilistically symmetric coverage interval
- 11.5.2 The limits of the shortest coverage interval
- 12 Test report
- Annex A (informative) Isolation and purification of iron
- Annex B (informative) Analysis flow chart
- Bibliography [Go to Page]