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Rapid Determination of Mercury in Plant and Soil Samples Using Inductively Coupled Plasma Atomic Emission Spectroscopy, a Comparative Study |
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| Authors: | Fengxiang X Han W Dean Patterson Yunju Xia B B Maruthi Sridhar Yi Su |
| Institution: | 1. Diagnostic Instrumentation and Analysis Laboratory (DIAL), Mississippi State University, 205 Research Blvd., Starkville, MS, 39759, USA 2. Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS, 39762, USA 3. Department of Forest Products, Mississippi State University, Mississippi State, MS, 39762, USA |
| Abstract: | The objectives of this study were to simplify sample preparation and validate mercury detection in soil and plant samples using inductively coupled plasma atomic emission spectroscopy (ICP-AES). A set of mercury contaminated and mercury free soil and plant samples were digested and analyzed by ICP-AES, inductively coupled plasma mass spectrometry (ICP-MS), and cold vapor atomic absorption spectroscopy (CVAAS). Results show that mercury measurements in soil and plant samples using ICP-AES were in agreement with those analyzed using ICP-MS and CVAAS. The concentrations of mercury in soils and plant tissues determined by ICP-AES were 92.2% and 90.5% of those determined by CVAAS and ICP-MS, respectively. Digestion of soil samples with 4 M HNO3 and direct measurement by ICP-AES without reduction of Hg2+ to Hg0 gave a reasonable and acceptable recovery (92%) for determining Hg in soils. We conclude that ICP-AES with optimized conditions (addition of gold chloride, extension of washing time, linear working range, and selection of wavelength – 194 nm) resulted in reliable detection of mercury in environmental samples. |
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