Groundwater arsenic in the Red River delta, Vietnam ... - Fiva

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Postma et al., submitted to Geochim. Cosmochim. Acta Fig. 4. Results of parallel extractions of river sand with 10 mM ascorbic acid for reductive dissolution and for proton induced dissolution with HCl. Both experiments were done at pH 3. For arsenic, the difference between As(tot) and As(V) is present as As(III). 39
Postma et al., submitted to Geochim. Cosmochim. Acta Fig. 5. Results of parallel extractions of oxidized aquifer sediment with 10 mM ascorbic acid for reductive dissolution and for proton induced dissolution with HCl. Both experiments were done at pH 3. For arsenic, the difference between As(tot) and As(V) is present as As(III). 40
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Groundwater arsenic in the Red Rive
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Søren Jessen Groundwater arsenic i
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organic matter may prevent As mobil
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Resumé Naturligt frigivet arsen (A
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efterfølgende forsøgt at opstille
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Preface This PhD thesis deals with
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Table of contents 1 INTRODUCTION: T
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The PhD research presented in this
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educed form as As(III), which is al
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A more complex and intimate relatio
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sedimentary As content (Postma et a
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(Anawar and Mihaljevi, 2009), and g
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3 Regional As distribution in the R
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in large part by changes in the eus
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In the Red River delta, the Pleisto
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the Red River delta, which are not
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5 The mitigation potential of bank
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Noteworthy is, that the ratio of Fe
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trend in the distribution of the RF
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2008) or the Hach or Merck test kit
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Badloe C., Nguyen T. P. T. and Nguy
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Driehaus W., Seith R. and Jekel M.
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Islam F. S., Boothman C., Gault A.
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Mondal D. and Polya D. A. (2008) Ri
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A. Ali and Z. Adeel). ITN Centre, B
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Ahmed K. M. (2006) A transect of gr
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Arsenic in groundwater of the Red R
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In short, there is a consensus amon
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The local geology shows mainly sand
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ane concentration and P CO2 values
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Fig. 7. The distribution of arsenic
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H3AsO3 þ H2O $ H2AsO4 þ 3H þ þ
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Fig. 12. The relative composition o
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of the Fe-oxides in the upper 3 m c
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found that while As(V) coprecipitat
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desh: further evidence of decouplin
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Controlling geological and hydrogeo
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Here the results of the geological
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sediments. In general, the coarser
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Fig. 5. Thickness of the clay-rich
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a b c The groundwater head distribu
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Table 2 Total As and stable isotope
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delayed yield from the fine grained
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that the situation in Dan Phuong co
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Mathers, S., Zalasiewicz, J., 1999.
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0883-2927/$ - see front matter © 2
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Jessen et al., manuscript to be sub
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Table 1
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Fig. 1
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Fig. 3
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Fig. 5
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Fig. 7
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Fig. 9
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Fig. 11
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