Analysis of formic acid and methanol in sodium chloride

Don’t listen to the nonsense from the second floor; it’s impossible to inject high-concentration saltwater samples into a gas chromatograph, as the chromatography column simply cannot handle such high concentrations of saltwater. It is better to determine this sample using a volumetric method, or it can be analyzed after distilling and separating formic acid from methanol in the sample. Due to the presence of formic acid, its content can be accurately determined through acid-base titration. Then, by determining the total organic carbon, the total carbon content of formic acid and methanol is calculated. After converting the organic carbon using the already known data for formic acid, the difference gives the organic carbon content of methanol; in this way, the individual contents of formic acid and methanol can be determined. Sodium chloride does not affect the determination of acid and total organic carbon.

Third floor, what do you mean by nonsense? That’s theoretical; in theory it’s correct and it always works. There is also the issue of efficiency and speed.

Laozi worked in the testing center of the petrochemical plant for no less than 10 years; what you’re talking about is nothing but random, baseless theory. You haven’t even figured out the nature of the sample, and yet you start criticizing it.

Harmony brings prosperity; in case of disputes or discussions, express your own views

We analyzed that the GC cannot detect molecules with such low CH content, and the FID either cannot measure them either – the level is too low; it’s estimated to be around 5 ppm. Ion chromatography is affected by Cl ions. In short, they said it’s not possible.

The main brine contains a small amount of sodium hydroxide, so titration is not feasible. Distillation also seems difficult; the TOC is only 5mg/l, but it can be tried.