Can we use COD measurement to characterizing N‑methyl‑2‑pyrrolidone (NMP) in wastewater?

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Gaurav H Tandon

Chemical Oxygen Demand (COD) measurement is a useful parameter for characterizing the organic pollution in wastewater, but its suitability for characterizing a specific compound like N-methyl-2-pyrrolidone (NMP) depends on several factors. Let's explore whether COD measurement can be used to characterize NMP in wastewater:

General Organic Content: COD measures the overall organic content in wastewater by oxidizing organic compounds to assess the amount of oxygen required. It doesn't specifically identify individual organic compounds. If NMP is present in wastewater along with other organic substances, COD can provide a general assessment of the wastewater's organic load but won't distinguish NMP from other organics.

Specificity: COD does not provide specific information about the presence or concentration of individual organic compounds. It's a bulk parameter that reflects the total organic content, so it cannot be used to characterize NMP specifically.

Quantification: COD measurement provides a quantitative value that represents the amount of oxygen consumed during the oxidation process. This value can be useful for regulatory compliance and assessing the overall biodegradability of wastewater but doesn't identify or quantify NMP on its own.

Interference: The presence of other organic and inorganic substances in wastewater can interfere with COD measurements. For accurate COD results, interference should be minimized through appropriate sample preparation and method selection.

If you specifically need to characterize and quantify NMP in wastewater, you should consider using techniques like high-performance liquid chromatography (HPLC) or gas chromatography-mass spectrometry (GC-MS). These analytical methods are capable of identifying and quantifying individual compounds, including NMP.

In summary, while COD measurement is a valuable tool for assessing the overall organic load in wastewater, it is not suitable for characterizing or quantifying specific compounds like NMP. To analyze NMP in wastewater, you should employ more targeted analytical techniques designed for compound-specific identification and quantification.

Laith A. Naji

To characterize and quantify N-methyl-2-pyrrolidone (NMP) in wastewater, using Chemical Oxygen Demand (COD) measurement alone may not be sufficient. COD is a useful parameter for assessing the overall organic content and pollution level of wastewater, but it does not provide specific information about individual organic compounds, including NMP.NMP is a specific organic compound, and its concentration in wastewater would require more targeted analytical methods.

Kai Bester

the easiest would be to find a partner that has access to the right instruments ;-).

COD meassurements can though work, if N-methyl-2-pyrrolidone (NMP) is the dominant compound in the water.

meaning if You background COD in the water You want to work with is 10 mg/L and the N-methyl-2-pyrrolidone (NMP) has a concentration of 100 mg/L You will have a 10% uncertainty on whether the observations you do is in reality due to the N-methyl-2-pyrrolidone (NMP). e.g. if You have removal of 50% of COD, You will not be 100% sure whether You have removed 50% N-methyl-2-pyrrolidone (NMP) or in reality 40% N-methyl-2-pyrrolidone (NMP) plus 100% residual other COD.

If You work at even higher concentrations the situation is getting even better.

Though this is doable, I guess You will not be able to publish in a high impact paper. - so I would not go that way. - But I have 2 LC-MS and access to 6 GC-MS ;-)