Abstract : Test limit for iron It creates ferrous thioglycolate complex based on the chemical reaction of iron in ammonical solution in the presence of iron-free citric acid with thioglycolic acid. As a result of the synthesis of ferrous thioglycolate complex, a purple colour is produced. The initial condition of iron is irrelevant since thioglycollic acid converts ferric iron to ferrous iron. Using 20% citric acid, which forms complexes with other metal ions and reduces their interference, this test is extremely sensitive (Purple colour can only be produced in an alkaline media, thus ammonia solution is employed. However, ammonia solution produces a precipitate with iron, so citric acid is added to make an ammonium citrate buffer, which stabilises the ferrous thioglycolate complex.). The colour of the sample under examination is compared to the colour of the reference solution.
Keywords : Standard Fe Solution, NaCl, 20% w/v Fe free citric acid, Distilled water (DW).
Cite : Diwan, A., & Kumar, K. (2022). To Perform And Report The Limit Test For Chloride In The Given Sample Of Sodium Chloride As Per Indian Pharmacopoeia (1st ed., p. 10). Noble Science Press. https://doi.org/10.52458/9789391842611.nsp2022.eb.asu.ch03
