BS 6068-2.12:1990

Committees responsible
National foreword
Method
1. Scope
2. Normative references
3. Definitions
4. Method A - Direct colorimetric method
5. Method B - Chloroform extraction method
6. Test report
Annex
A. Checking the concentration of the phenol stock
    solution (4.2.9)

Applicable to drinking waters, surface waters and waste waters, containing phenol concentrations above about 0.002 mg/l.

This International Standard specifies methods for determining the phenol index (3.2) in drinking waters, surface waters and waste waters.

After a preliminary distillation, the test samples are analysed according to specific application as follows:

method A (direct colorimetric method): this method is capable of measuring the phenol index in test samples that contain more than 0,10 mg/l in the aqueous phase (without chloroform extraction), using phenol as a standard;

method B (chloroform extraction method): this method is capable of measuring the phenol index without dilution from about 0,002 mg/l to about 0,10 mg/l when the coloured end-product is extracted and concentrated in chloroform phase, using phenol as a standard.

NOTE 1 The limits of detection achievable with both methods are insufficient for checking compliance with the limits given in the Directive 80/778/EEC for drinking water.

NOTE 2 According to the results of a German interlaboratory trial using a method almost identical to method B, the lower limit of detection is 0,01 mg/l.