Method for determining the concentration of iron ions in hydrocarbon compositions

摘要

The present invention relates to a method for determining the concentration of iron ions in a hydrocarbon composition, as well as reagents and kits for use in such methods. The method utilises a thiocarboxylic acid having formula (I) which reduces the ferric ions and complexes ferrous ions producing a colored solution, which can be analysed to determine the amount of iron ions in the starting sample.

主权项

1. A method for determining the concentration of iron ions in a hydrocarbon composition, said method comprising:
a) providing a hydrocarbon composition; b) reacting the hydrocarbon composition with a reagent composition and optionally a diluent composition comprising a non-polar solvent to provide a test sample,
whereinthe reagent composition comprises water and a compound according to formula (I):  wherein  n denotes an integer from 0 to 3, and  R denotes H, alkyl or aryl, and  wherein the reagent composition has a pH of 7.5 or above; and c) determining the concentration of iron ions in the hydrocarbon sample by determining the amount of complex formed between the compound of formula (I) and iron ions in the test sample.