The present method is based on a microwave-assisted extraction, whose procedure is described in Section 2.4.3. For this study, the CRM DOLT-4 (Dogfish) was used. In DOLT-4, MeHgþ and iHg were the species present in the extracts. Fig. 1 shows chromatograms obtained from hydrochloric and nitric acid DOLT-4 extracts, in which Hg species are highlighted. Recoveries obtained for MeHgþ were 95% and 86%, using HCl and HNO3, respectively. On measuring iHg, the concentration obtained when using HCl was 46% of the total certified content; whereas, when using HNO3, the figure was 85%. This increase could be attributed to the oxidising action of HNO3. As MeHgþ recovery with the HNO3 extraction method is 9% less than recovery with HCl extraction, there is evidence that this difference could be caused by MeHgþ conversion to iHg. Therefore,
HCl 4 mol L1 was selected as the extractant agent
The present method is based on a microwave-assisted extraction, whose procedure is described in Section 2.4.3. For this study, the CRM DOLT-4 (Dogfish) was used. In DOLT-4, MeHgþ and iHg were the species present in the extracts. Fig. 1 shows chromatograms obtained from hydrochloric and nitric acid DOLT-4 extracts, in which Hg species are highlighted. Recoveries obtained for MeHgþ were 95% and 86%, using HCl and HNO3, respectively. On measuring iHg, the concentration obtained when using HCl was 46% of the total certified content; whereas, when using HNO3, the figure was 85%. This increase could be attributed to the oxidising action of HNO3. As MeHgþ recovery with the HNO3 extraction method is 9% less than recovery with HCl extraction, there is evidence that this difference could be caused by MeHgþ conversion to iHg. Therefore,
HCl 4 mol L1 was selected as the extractant agent
การแปล กรุณารอสักครู่..
