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Table III Extractable arsenic content of sediments.

From: The influence of groundwater chemistry on arsenic concentrations and speciation in a quartz sand and gravel aquifera)

   

Arsenic(nmol/g)

Core number

Altitude (m)a

Mineral fraction

Oxidativeb

Reductivec

< 2 mm size fraction

R23AWC02d

13.4 ± 0.2

whole

4.0 ± 0.2

1.08 ± 0.03

R23AWC02e

12.9 ± 0.2

whole

2.3 ± 0.7

1.11 ± 0.01

R23AWC03f

13.4 ± 0.2

whole

3.2 ± 1.1

0.98 ± 0.04

R23AWC03g

12.9 ± 0.2

whole

2.0 ± 0.6

0.97 ± 0.02

94UZComposite

 

wholeh

5.18 ± 0.02

0.91 ± 0.02

> 2 mm size fraction

R23AWC03

13.4 ± 0.2

whole except quartz

1.54

0.90

R23AWC03i

13.4 ± 0.2

quartz grains

nd

0.66

R23AWC02

13.4 ± 0.2

whole except quartz

0.33

1.49

R23AWC02j

13.4 ± 0.2

quartz grains

nd

1.77

  1. nd=not determined.
  2. aAltitude (meters to sea level) of middle of 0.4-m-long cored interval.
  3. bHot, concentrated nitric acid and hydrogen peroxide.
  4. cHydroxylamine hydrochloride at 50°C for 96 h.
  5. d< 2 mm size fraction comprised 97% by weight of sample.
  6. e< 2 mm size fraction comprised 90% by weight of sample.
  7. f< 2 mm size fraction comprised 98% by weight of sample.
  8. g<2 mm size fraction comprised 91% by weight of sample.
  9. h< 1 mm size fraction.
  10. iQuartz grains comprised 36% by weight of >2 mm size fraction.
  11. JQuartz grains comprised 22% by weight of >2 mm size fraction.
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Geochemical Transactions

ISSN: 1467-4866

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