WATER QUALITY--Analytical methods; Biochemical Oxygen Demand, Carbonaceous



In Reply Refer To:                           September 22, 1980
EGS Mail Stop 412


QUALITY OF WATER BRANCH TECHNICAL MEMORANDUM NO. 80.28

Subject:  WATER QUALITY--Analytical methods; Biochemical Oxygen
                         Demand, Carbonaceous

The subject provisional method is attached, and is approved for 
use in the Water Resources Division.  The method departs from 
customary methods for determining Biochemical Oxygen Demand (BOD)
in its use of a chemical inhibitor to block nitrification, thus 
preventing the nitrogenous, or second stage, BOD from being 
consumed.  Values obtained from application of this method should 
be entered into WATSTORE under a code specifying the carbonaceous 
form even though only a 5-day value may be obtained, a value which 
should not, even in the absence of the chemical inhibitor, include 
the nitrogenous DOD.  Appropriate WATSTORE parameter codes are 
listed at the beginning of the method and will shortly appear in 
the WATSTORE parameter list.

Questions or comments regarding the application of this method 
should be directed to Chief, Quality of Water Branch, MS 412 
(FTS 928-6834).  Please distribute copies of this memorandum and 
attached method to the appropriate offices.



                           R.J. Pickering

Enclosure

Distribution:  A, B, S, FO, PO