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Table 1 Results of the adsorption/desorption of N2 at 77 K in ferrihydrite and effect of sodium chloride concentration and initial pH values on the pH at the point of zero charge (pHPZC)

From: The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

Applied method

Ferrihydritea

Ferrihydrite + glyphosateb

 

BET surface area (m2 g−1)

234

196

 

BJH pore volume (cm3 g−1)

0.116

0.091

 

DH pore volume (cm3 g−1)

0.115

0.091

 

BJH pore size (nm)a

1.69

1.68

 

DH pore size (nm)a

1.69

1.68

 

[NaCl]/mol L−1

pHPZC

Glyphosate/µmol

0.0

0.0

41.4

Without pH adjust

pH = 5.0

0

8.47

7.76

4.96

0.01

8.20

7.08

5.10

0.1

8.33

8.52

4.99

  1. BET Brunauer–Emmett–Teller, BJH Barrett–Joyner–Halenda, DH Dollimore-Heal
  2. a Pore radius, b ferrihydrite used as synthesized, c ferrihydrite plus 30.0 µmol of glyphosate dissolved in 10 mL of 0.10 mol L−1 of NaCl at pH = 5.0. For the experiments of pHPZC was used an initial pH of 5.0. For all experiments was used 60 mg of ferrihydrite. The results were a mean of two experiments
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Geochemical Transactions

ISSN: 1467-4866

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