[curiouscat]

I was reading this pdf document (link below) from the UK environment agency about COD and the Section on Calibration seems wrong to me. In this table below, if I am reading it correctly, 0.938 mg/L of glucose is said to correlate with 1000 mg/L COD.



Barely 1 mg/L seems just too low to give a COD of 1000, seems to my intuition (and some back of the envelope calculations). Is this an error? Should it have been 0.938 gm/L

OTOH  the document has a reputable pedigree so I may be the one who's wrong. Just wanted to check what people think.


http://www.environment-agency.gov.uk/static/documents/Research/COD-215nov.pdf

[DrCMS]

Looking at table E2 on page 58 and back calulating the weight of sodium acetate trihydrate that contains as much acetic acid as the 508mg mentioned in E2 giving a theortical 542mg/L COD means  2140mg/L sodium acetate trihydrate should give 1000mg/L COD.  The same calulation for sodium oxalate and oxalic acid gives 8257mg/l.  So yes I thing the values given in the bit you have shown us are wrong and should be g/L.

[curiouscat]

Looking at table E2 on page 58 and back calulating the weight of sodium acetate trihydrate that contains as much acetic acid as the 508mg mentioned in E2 giving a theortical 542mg/L COD means  2140mg/L sodium acetate trihydrate should give 1000mg/L COD.  The same calulation for sodium oxalate and oxalic acid gives 8257mg/l.  So yes I thing the values given in the bit you have shown us are wrong and should be g/L.

Ah! Hadn't noticed that table.

Thanks for verifying this!