Spectroscopic determination of mercury(II) with dimercaptophenols in the presence of hydrophobic amines

The extraction of mercury (II) ions from solutions of dimercaptophenolates in chloroform in the presence of hydrophobic amines was studied. Optimum conditions for mercury extraction, pH۱/۲ parameter and composition of extracted complexes are determined. The following dimercaptophenols (DP) are used: ۲,۶-dimercaptophenol (DMP), ۲,۶-dimercapto-۴-methylphenol (DMP), ۲,۶-dimercapto-۴-propylphenol (DMPP), ۲,۶-dimercapto-۴-isopropylphenol (DMIPP) and ۲,۶-dimercapto-۴-second-butylphenol (DMSBP). Among the hydrophobic amines used were aniline, N-methylaniline and N,N-dimethylaniline. Among the studied amines, N,N-dimethylaniline has the best extraction ability. It is established that ionic associates are formed in a slightly acidic medium (рНоpt ۲.۹-۴.۵). Maximums in light absorption spectra are observed at λ=۴۵۸-۴۷۲ nm. The molar coefficient of light absorption is equal to ε = (۲.۸۲-۳.۷۵)∙۱۰۴. Based on the obtained data, extraction-spectrophotometric methods for determining mercury in beef liver, cheese, beef meat, fish and wheat were developed.

کلیدواژه ها:

Mercury ، hydrophobic amines ، extraction-photometric method ، Determination