BS ISO 10348:1993

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)

This International Standard gives methods for determining the silver content in photographic effluents from photographic processing wastes. Sampling, sample preservation and analytical methodology are included. Three analytical procedures are given with two supporting sample treatment methodologies: a flame atomic absorption spectroscopy (AAS) method; two Potentiometrie iodide titration (PT) methods. The choice of treatment is dependent on the analysis method and form of sample. Where AAS is the chosen method for analysis, cyanogen iodide-treated or preserved samples may be analysed directly. For the PT method, two digestion procedures are given: Digestion A for effluents with low salt content, and Digestion B for samples with high solids content.