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A Simplified Drying Procedure for Analysing Hg Concentrations

Smeds, Jacob and Öquist, Mats and Nilsson, Mats and Bishop, Kevin (2022). A Simplified Drying Procedure for Analysing Hg Concentrations. Water, Air, and Soil Pollution. 233 , 216
[Research article]

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Abstract

Mercury (Hg) in peatlands remains a problem of global interest. To mitigate the risks of this neurotoxin, accurate assessments of Hg in peat are needed. Treatment of peat that will be analysed for Hg is, however, not straightforward due to the volatile nature of Hg. The drying process is of particular concern since Hg evasion increases with the temperature. Samples are, therefore, often freeze-dried to limit Hg loss during the drying processes. A problem with freeze-drying is that cost and equipment resources can limit the number of samples analysed in large projects. To avoid this bottleneck, we tested if drying in a 60 degrees C-degree oven could be an acceptable alternative to freeze-drying. We both freeze-dried and oven-dried (60 degrees C) 203 replicate pairs of peat samples, and then examined the differences in total Hg concentration. The Hg concentration differed significantly between the two drying methods with a median Hg deficit in oven-dried samples of 4.2%. Whether a 4.2% deficit of Hg depends on one's purpose. The lower median Hg concentration in oven-dried samples has to be weighed against the upside efficiently drying large sets of peat samples. By freeze-drying a subset of the samples, we fitted a function to correct for Hg loss during oven-drying (y = 0.96x + 0.08). By applying this correction, the freeze-drying bottleneck could oven-dry large-scale inventories of total Hg in peatlands with results equivalent to freeze-drying, but only have to freeze-dry a subset.

Authors/Creators:Smeds, Jacob and Öquist, Mats and Nilsson, Mats and Bishop, Kevin
Title:A Simplified Drying Procedure for Analysing Hg Concentrations
Series Name/Journal:Water, Air, and Soil Pollution
Year of publishing :2022
Volume:233
Article number:216
Number of Pages:9
Publisher:SPRINGER INT PUBL AG
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Non-Toxic Environment
ISSN:0049-6979
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Sample preparation, Drying procedure, Freeze-drying, Oven-drying, Mercury, Peat
URN:NBN:urn:nbn:se:slu:epsilon-p-117567
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117567
Additional ID:
Type of IDID
DOI10.1007/s11270-022-05678-7
Web of Science (WoS)000805193500001
ID Code:28473
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Dept. of Forest Ecology and Management
(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:18 Aug 2022 15:00
Metadata Last Modified:18 Aug 2022 15:01

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