What is BS 6068-2.12 — Physical, chemical, and biochemical methods about? 
BS 6068-2.12 specifies methods for determining the phenol index (3.2) in waters, surface waters, and wastewaters. After a preliminary distillation, the test samples are analyzed according to the 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/ 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 colored end-product is extracted and concentrated in the 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.
Who is BS 6068-2.12 — Physical, chemical, and biochemical methods for? 
BS 6068-2.12 on the Physical, chemical and biochemical methods are useful for: 
- Wastewater collecting systems 
- Wastewater treatment plants 
- Plants treating industrial wastewater 
- Water supply treatment plants  
Why should you use BS 6068-2.12— Physical, chemical, and biochemical methods? 
Phenol index is widely considered to be a useful indicator of the purity and quality of water. Usually, phenol index is determined using a spectrophotometric method calibrated using phenol standards.
BS 6068-2.12 provides methods for characterizing water quality based on physical, chemical, and biochemical measures for determining the phenol index using the 4-aminoantipyrine (4-aminophenazone) spectrometric methods after distillation.
BS 6068-2.12 provides you with apparatus, sampling, transport, storage, and preparation of test pieces, preparation of reagents and apparatus, pre-treatment of test pieces, test procedure, and much more.
The test methods and procedures provided by BS 6068-2.12 assist you in the determination of phenol index in water and ensure reducing the risk of severe health issues.
With obedience and compliance to BS 6068-2.12, you can enhance the efficacy of the water and manufacture a standardized product.
