UNI EN ISO 15681-1 : 2005

Foreword
Introduction
1 Scope
2 Normative references
3 Interferences
   3.1 General interferences
   3.2 Interferences in the determination of total-P
4 Principle
   4.1 Determination of orthophosphate
   4.2 Total phosphorus with manual digestion
5 Reagents
6 Apparatus
   6.1 Flow injection analysis (FIA)
   6.2 Additional apparatus
   6.3 Additional apparatus for the determination of total
       phosphorus
7 Sampling and sample preparation
8 Procedure
   8.1 Analysis preparation
   8.2 Instrument performance check
   8.3 Reagent blank check
   8.4 Calibration
   8.5 Check of digestion efficiency for determination of
       total-P
   8.6 Measurement
   8.7 Closing down the system
9 Calculation of results
10 Expression of results
11 Test report
Annex A (informative) Example of an FIA system
Annex B (informative) Precision and accuracy
Annex C (informative) Determination of orthophosphate-P and
                      total-P by FIA using ascorbic acid
                      reduction
Annex D (informative) Replacement of hydrazine sulfate by DEHA
                      (N,N-diethylhydroxylamine)
Bibliography

Provides flow injection analysis (FIA) methods for the determination of orthophosphate in the mass concentration range from 0,01 mg/l to 1,0 mg/l (P), and total phosphorus by manual digestion in accordance with ISO 6878 for the mass concentration range from 0,1 mg/l to 10 mg/l (P). Applicable to various types of water (such as ground, drinking, surface, leachate and waste waters).