NEN EN ISO 13395 : 1997

Committees responsible
National foreword
Foreword
Method
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Checking the flow system
7 Sampling and sample preparation
8 Interferences
9 Procedure
10 Evaluation
11 Expression of results
12 Precision
13 Test report
Annexes
A (informative) Examples of flow injection systems (5.1)
    for the determination of nitrite(N) and nitrite/
    nitrate (N)
B (informative) Examples of continuous flow systems
    (5.2) for the determination of nitrate (N) and
     nitrite/nitrate (N)
C (informative) Example of a continuous flow system
    (so-called 'macroflow') (5.2) for the determination
    of 0,2 mg/l to 2 mg/l nitrite/nitrate (N)
D (informative) Bibliography
Tables
1 Options for preparing the solutions C and B in
    figures A.1, B.1 and C.1
2 Preparation of the calibration solutions for
    nitrite (N)
3 Preparation of the calibration solutions for
    nitrite/nitrate (N)
4 Statistical data for the determination of nitrite (N)
    with flow injection analysis (FIA)
5 Statistical data for the determination of nitrite (N)
    with continuous flow analysis (CFA)
6 Statistical data for the determination of nitrite/
    nitrate (BN) with flow injection analysis (FIA)
7 Statistical data for the determination of nitrite/
    nitrate (N) with continuous flow analysis (CFA)

Describes a method for determining nitrite, nitrate or the sum of both [nitrite/nitrate(N)] in different water types including ground, drinking, surface and waste waters in mass concentrations ranging from 0,01 mg/1 for nitrite (N) and from 0,2 mg/l to 20 mg/l for nitrite/nitrate(N), in an undiluted sample.