NDLI: Spatial variability and trigger values of arsenic in the surface urban soils of the cities of Tampere and Lahti, Finland

Content Provider	Springer Nature Link
Author	Buttafuoco, Gabriele Tarvainen, Timo Jarva, Jaana Guagliardi, Ilaria
Copyright Year	2016
Abstract	Mapping arsenic (As) concentration of urban soils and defining the upper limit of regional geochemical baseline variation are preliminary steps in assessing As contamination and deciding possible remediation needs. The surface urban soils of two Finnish cities (Tampere and Lahti) were studied with the aim of modelling the spatial variability of As concentration, assessing the uncertainty associated with mapping and delineating areas having As concentration higher than a defined trigger value. The cities of Tampere and Lahti are located in the natural geochemical As provinces where most of the As in the baseline mapping samples has a geogenic source. A geostatistical approach was used to assess the spatial variability of As and turning bands method to draw a series of stochastic realizations. The differences between realizations provided a measure of spatial uncertainty and allowed the assessment of the probability that As concentration exceeds a critical threshold. Results showed a short-range component in the variogram model for Lahti that may be related to anthropogenic sources of As as well. Arsenic concentrations are generally higher in Tampere than in Lahti due to its high natural concentrations in bedrock and soil. The widespread anthropogenic short-range component was not observed in Tampere while misting up with natural As concentration because of the natural level of As in the soil. The upper limit of the baseline variation values for Tampere (15 mg kg$^{−1}$) and Lahti (6 mg kg$^{−1}$) is suggested as regional trigger value for assessment of soil contamination and remediation needs. The results show that geostatistical analysis with stochastic simulations could be adopted to delineate other areas where lower or higher trigger values could be used.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	10
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-05-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic Urban soils Spatial variability Stochastic simulation Baseline Trigger value Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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