Extraction of ultratrace dissolved gaseous mercury and reactive mercury in natural freshwater for stable isotope analysis

Zhang, Hui; Wu, Xian; Deng, Qianwen; Zhang, Leiming; Fu, Xuewu; Feng, Xinbin

doi:10.1039/d1ja00212k

Cited by 3 publications

(5 citation statements)

References 54 publications

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“…Although even lower sample flow rates (<125 mL/min) could potentially provide more consistent and reliable recoveries, it makes no sense as the objective of this method was to preconcentrate Hg in larger volume samples in a shorter time. Therefore, in our method, we set 250 mL/min as the sample flow rate, as this still provided acceptable Hg recoveries (92.1 ± 3.7%, n = 7, 1SD) and will obtain a sample preparation time that is 2–6 times shorter than that obtained by the traditional purge and trap method , and the chromatographic method , (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…Besides, in field applications, the pretreatment of coastal seawater using the coprecipitation method often gave recoveries of >110% (112–128%) . The purge and trap method yielded reasonable Hg isotope results, but it is inconvenient as it requires large bottles and sufficient time to collect enough seawater (typically several L) for subsequent laboratory pretreatment. , The traditional purge and trap method may be improved with the goal of time-saving by preconcentrating seawater Hg in the field. To meet this goal, here, we developed the continuous flow–double purge and trap method to preconcentrate Hg from large volumes of seawater for Hg isotope analysis.…”

Section: Introductionmentioning

confidence: 99%

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Continuous Flow–Double Purge and Trap Method for Preconcentrating Mercury in Large Volumes of Seawater for Stable Isotope Analysis

He,

Lv,

Yin

et al. 2024

Anal. Chem.

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Mercury (Hg) isotopes provide a useful tool to understand Hg sources and processes in the environment. The Hg isotopic composition of seawater remains poorly constrained due to the lack of an efficient method to process large volumes of low-Hgconcentration seawater samples. Here, we develop a continuous flow−double purge and trap device for the in situ preconcentration of Hg in seawater. This method yielded a good Hg recovery of 91.7 ± 3.3% (n = 4, 1SD) for spiked seawater samples and gave reasonably similar Hg isotope ratios of NIST 8610, indicating a limited matrix effect and limited Hg isotope fractionation during processing of seawater. NIST 8610 δ 202 Hg (−0.55 ± 0.09‰, n = 4, 1SD) and Δ 199 Hg (0.07 ± 0.02‰, n = 4, 1SD) were similar to previously published data. The method was successfully applied to seawater collected from the Xiamen Bay and the South China Sea. The seawater samples showed a Hg recovery of 91.6 ± 5.4% (n = 12, 1SD). Seawater Δ 199 Hg (−0.04 ± 0.05‰, n = 7, 1SD) in the Xiamen Bay was different from seawater Δ 199 Hg (0.05 ± 0.07‰, n = 5, 1SD) in the South China Sea, which implies distinct Hg sources to coastal and open ocean areas and highlights the robustness of our method in understanding the Hg isotopic composition of seawater.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous Flow–Double Purge and Trap Method for Preconcentrating Mercury in Large Volumes of Seawater for Stable Isotope Analysis

He,

Lv,

Yin

et al. 2024

Anal. Chem.

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“…The Hg(0) collected on CLC traps was preconcentrated into 5 mL of 40% reverse aqua regia acid-trapping solution (v/ v, 2HNO 3 :1HCl) using a thermally desorbed method. 46 After the thermal combustion, the trapping solutions were kept in a 20 mL brown screw neck borosilicate glass bottle and stored in a refrigerator at 3 ± 1 °C before Hg concentration and isotopic analysis. Hg concentrations in trapping solutions were determined using a standard purge and trap method with chloride (SnCl 2 ) reduction following the USEPA method 1631.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…Δ 200 Hg water is the DHg isotopic compositions in surface water, which was collected by the CLC traps method (Text S3). 46 DHg represents the sum of dissolved Hg(0) and Hg(II). The detailed information of the calculation method can be found in Text S4.…”

Section: Measurement Of Hg Isotopes In Hg(0) Emissionand Deposition-c...mentioning

confidence: 99%

Using Mercury Stable Isotopes to Quantify Bidirectional Water–Atmosphere Hg(0) Exchange Fluxes and Explore Controlling Factors

Zhang

et al. 2023

Environ. Sci. Technol.

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In this study, exchange fluxes and Hg isotope fractionation during water−atmosphere Hg(0) exchange were investigated at three lakes in China. Water−atmosphere exchange was overall characterized by net Hg(0) emissions, with lake-specific mean exchange fluxes ranging from 0.9 to 1.8 ng m −2 h −1 , which produced negative δ 202 Hg (mean: −1.61 to −0.03‰) and Δ 199 Hg (−0.34 to −0.16‰) values. Emission-controlled experiments conducted using Hg−free air over the water surface at Hongfeng lake (HFL) showed negative δ 202 Hg and Δ 199 Hg in Hg(0) emitted from water, and similar values were observed between daytime (mean δ 202 Hg: −0.95‰, Δ 199 Hg: −0.25‰) and nighttime (δ 202 Hg: −1.00‰, Δ 199 Hg: −0.26‰). Results of the Hg isotope suggest that Hg(0) emission from water is mainly controlled by photochemical Hg(0) production in water. Deposition-controlled experiments at HFL showed that heavier Hg(0) isotopes (mean ε 202 Hg: −0.38‰) preferentially deposited to water, likely indicating an important role of aqueous Hg(0) oxidation played during the deposition process. A Δ 200 Hg mixing model showed that lake-specific mean emission fluxes from water surfaces were 2.1−4.1 ng m −2 h −1 and deposition fluxes to water surfaces were 1.2−2.3 ng m −2 h −1 at the three lakes. Results from the this study indicate that atmospheric Hg(0) deposition to water surfaces indeed plays an important role in Hg cycling between atmosphere and water bodies.

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“…The δ 138 Ba value was determined by MC-ICP-MS. Dissolved gaseous Hg and reactive Hg fractions were purged 105 from 10 L batches of water samples after addition of acidic SnCl 2 . The Hg 0 generated was captured on a Cl-impregnated activated-carbon-trap before thermal desorption and trapping in a 40% reverse aqua regia solution for determination of δ 202 Hg, Δ 199 Hg, and Δ 200 Hg by MC-ICP-MS.…”

Section: Water Analysismentioning

confidence: 99%

Atomic spectrometry update – a review of advances in environmental analysis

Bacon

Butler

Cairns

et al. 2023

J. Anal. At. Spectrom.

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Extraction of ultratrace dissolved gaseous mercury and reactive mercury in natural freshwater for stable isotope analysis

Abstract: Dissolved gaseous mercury (DGM) and reactive mercury (RHg) are important Hg forms in natural water bodies. Knowledge of the concentration levels and isotope compositions of DGM and RHg in aquatic...

Cited by 3 publications

References 54 publications

Continuous Flow–Double Purge and Trap Method for Preconcentrating Mercury in Large Volumes of Seawater for Stable Isotope Analysis

Continuous Flow–Double Purge and Trap Method for Preconcentrating Mercury in Large Volumes of Seawater for Stable Isotope Analysis

Using Mercury Stable Isotopes to Quantify Bidirectional Water–Atmosphere Hg(0) Exchange Fluxes and Explore Controlling Factors

Atomic spectrometry update – a review of advances in environmental analysis

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