EN ISO 7393-1:2000

National foreword
0 Introduction
1 Scope and field of application
2 Definitions
3 Principle
4 Reagents
5 Apparatus
6 Procedure
7 Correction of interference due to the presence of
      oxidized manganese
8 Expression of results
9 Interferences
10 Test report
Annex A - Separate determinations of combined chlorine of
          the monochloramine type, combined chlorine of
          the dichloramine type and of combined chlorine
          in the form of nitrogen trichloride
Annex B - Preparation of water free from oxidizing and
          reducing substances
Bibliography
Table 1 - Terms and synonyms in relation to actual compounds
          in the solution
Table 2 - Analytical parameters from interlaboratory analysis
          for free residual chlorine

Specifies a procedure for water. Sea water and waters containing bromides and iodides comprise a group for which special procedures are required. The procedure is applicable to concentrations, in terms of chlorine, from 0,000 4 to 0,07 mmol/l total chlorine and at higher concentrations by dilution of samples. Several compounds influencing the procedure are noted.