1 Scope
2 Normative references
3 Principle
3.1 Flame atomic absorption spectroscopy (AAS)
methodology
3.2 Potentiomentric titration (PT) methodology
4 Reliability
5 Safety and operational precautions
5.1 Hazard warnings
5.2 Hazard information code system
5.3 Safety precautions
5.4 Operational precautions
6 Reagents
7 Glassware
8 Sampling and sample pretreatment
8.1 Sampling and preservation
8.2 Sample size and pretreatment
9 Preparation of test sample
9.1 Cyanogen iodide (CNI) treatment
9.2 Concentration and digestion (Digestion A)
9.3 Vigorous digestion (Digestion B)
10 Analysis by atomic absorption spectroscopy (AAS)
10.1 Special apparatus
10.2 Procedure
11 Analysis by potentiometric iodide titration (PT)
11.1 Special apparatus
11.2 Procedure
11.3 Calculations for titration methods
Annex
A Preparation of reagent solutions
A.1 Preparation of cyanogen iodide solution (CNI)
(DANGER: << S >> < B > < C >)
A.2 Preparation of silver standard solutions (0,5 mg/1,
1.0 mg/1, 3,0 mg/1 and 5.0 mg/1) for AAS method
A.3 Preparation of silver nitrate standard solutions
(0,100 mol/1, 0,0010 mol/1 and 0,001 mol/1) for PT
methods
A.4 Preparation of potassium iodide standard solutions
(0,1 mol/1, 0,01 mil/1 and 0,001 mol/1)