Speciation and isotopic characterization of mercury detected at high concentration in Pakistani hair samples. (October 2019)

• Record Type: Journal Article
• Authors: Kanwal, Sadia; Yamakawa, Akane; Narukawa, Tomohiro; Yoshinaga, Jun
• Is Part Of: Chemosphere. Volume 233(2019)
• Page Start: 705
• Page End: 710
• Publication Date: 2019-10
• Subjects: Mercury -- Hair -- Skin lightning cream -- Speciation -- Stable isotope ratios; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.05.275
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Speciation and isotopic analyses of mercury (Hg) detected at high concentration (11–107 mg total Hg/kg) in the hair samples of Pakistani subjects were carried out to analyze whether the source of Hg was the skin cream or the soap they used. Liquid chromatography-ICP mass spectrometric speciation analysis revealed that the Hg in the hair was primarily inorganic. This result supported our assumption that skin care products were the source of the high concentration of Hg in hair, which was based on the statistical association found in our previous study because it is known that inorganic Hg compounds are added to some skin care products sold in some countries. Stable isotope ratios of the Hg in the hair samples of 6 subjects and 3 skin cream samples, which were reported to be used by the subjects, were measured by multi-collector ICP mass spectrometry after acid digestion. A comparison of the isotopic compositions of Hg in hair and skin cream in two subjects revealed that the composition in both samples matched in one subject, hence confirming that the products were the source of high Hg concentration in hair. However, the isotopic compositions of Hg in hair and skin cream did not match in the other subject demonstrating the presence of other exposure source(s). Highlights: Speciation and isotope ratios of mercury detected high concentration in hair were analyzed. Mercury in the hair samples was mostly inorganic and methymercury was negligible. High level of Hg was detected in some of the skin lightning creams the subjects used. Isotopic ratios of hair and skin creams were consistent in one subject but not in the other.