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Table 5 Assignments of frequencies (cm−1) in FTIR spectra of ferrihydrite, glyphosate and glyphosate adsorbed onto ferrihydrite

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

FeHydr (cm−1)

GPS (cm−1)

Glyphosate adsorbed onto ferrihydrite (cm−1)

Tentative assignments

pH 2.0

pH 4.0

pH 5.0

pH 6.0

 

1731b

    

C=O Stretching3

1635a

     

Adsorbed or lattice water1, 2

  

1604d

1607d

1605c

1602d

C–O stretching6, 8

 

1556b

    

NH2+ deformation4

  

1534d

1528d

1530c

1530d

NH2+ deformation6−8

 

1481b

    

NH2+ DEFORMATION4

1472a

     

Carbonate1, 2

  

1444d

1445d

1452c

1450d

NH2+ deformation7, 8

 

1432b

    

CH2 group4

 

1420b

    

CO, OH group4

  

1376d

1380d

1377c

1382d

C–O stretching6

1345a

     

Carbonate1, 2

 

1334b

    

CH2 deformation4

  

1314d

1318d

1316c

1320d

Carbon backbone coupled with C–O and P–O stretching6

  

1270d

1268d

1269c

1268d

PO3H group (P=O)4

 

1267b

    

PO3H group (P=O)4

 

1242b

    

CH2 group4

 

1220b

    

P–OH4

 

1200b

    

CO, OH group4

  

1119a

1123a

1122a

1121a

P–O stretching6, 7

 

1088b

    

PO3Stretching3, 4

 

1077b

    

P–O-stretching, PO2(OH-) group5

1076a

     

Carbonate1, 2

  

1049a

1049a

1048a

1048a

CCNC skeletal vibration7

 

1030b

    

CCNC skeletal vibration4

  

987a

981a

983a

980a

P-OFe stretching6

 

978b

    

Symmetric stretching P–O3, 5, CH2 group4

 

909b

    

Stretching P–O5, CH2 deformation4, CCNC skeletal vibration4

896a

     

Carbonate1, 2

 

864b

    

COH deformation4

 

828b

    

POH deformation4

  1. FeHydr ferrihydrite, GPS glyphosate
  2. 1Mazzetti and Thistlethwaite [36]; 2Ristić et al. [37]; 3Barja and Afonso [21]; 4Miano et al. [24]; 5Undabeytia et al. [23]; 6Sheals et al. [17]; 7Barja and Afonso [19]; 8Barja et al. [22]
  3. a peaks from the Fig. 4a; bpeaks from the Fig. 4b, cpeaks from Fig. 5a; dFigure not shown