Diapositiva 1 - PowerPoint PPT Presentation

1 / 25

About This Presentation

Title:

Diapositiva 1

Description:

Diapositiva 1 – PowerPoint PPT presentation

Number of Views:68

Avg rating:3.0/5.0

Slides: 26

Provided by: ACE5132

Category:

more less

Transcript and Presenter's Notes

Title: Diapositiva 1

1
Desarrollos Agrochem South Africa 30 Diaz
Village Orion Close Somerset West 7130
INTERACTION OF DIFERENT Fe-EDDHA CHELATES WITH
SOIL MATERIALS.
Distributed by
2
OBJECT

To compare the differences of retencion in soils
and soil materials among products with several
purities and to relate it with the different iron
fractions presents in their composition.

3
MATERIAL AND METHODS

Composition of Fe Chelates used in the
experiment

4
MATERIAL AND METHODS

Material used for the interaction with the
chelates

5
MATERIAL AND METHODS
10 µgFe(nominal) / ml
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 3 reps
Álvarez-Fernández et al., 1997
0.45 µM
controls of chelates and materials
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
Álvarez-Fernández et al., 1997
0.45 µM
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
6
MATERIAL AND METHODS
pIII related to ppEDDHA (sybthesis
byproducts) pIV assigned to Fe-opEDDHA
0.45 µM
Atomic Absorption Soluble Fe, Mn, Cu and Zn pH
pIII related to ppEDDHA (sybthesis
byproducts) pIV assigned to Fe-opEDDHA
pIII
pIV
rac Fe-oo-EDDHA
Meso Fe-oo-EDDHA
absorbance
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
Retention time
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
Atomic Absorption Soluble Fe, Mn, Cu and Zn pH
1h, 60 s-1, 25ºC
3d, still, 25ºC
10 ml 10 µgFe(nominal) / ml 3 reps controls of
chelates and materials
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
Atomic Absorption Soluble Fe, Mn, Cu and Zn pH
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
1h, 60 s-1, 25ºC
3d, still, 25ºC
Álvarez-Fernández et al., 1997
0.45 µM
Álvarez-Fernández et al., 1997
0.45 µM
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
Álvarez-Fernández et al., 1997
7
RESULTS AND DICUSSION Soluble Fe
In all cases, except for lime and
Montmorrillonite (less active materials), there
is a good relation between the percentage of
chelated iron and the iron remaining after
interaction with soil materials.
RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
8
RESULTS AND DICUSSION Soluble Fe

The behavior of the three soils should be taken
into account. Total iron is not relevant for the
product agronomic efficacy in soil. If we
consider total iron percentage which remains in
solution respect to that added and we compare it
with the percentage of chelated iron of the
products (Figure),

a) The purest chelates are those which maintain
more iron in solution for all materials.
b) There is no linearity, because Sequestrene,
which presents a very high excess of soluble iron
respect to the chelated one, and that
precipitates in the interaction, shows lower
recuperation percentages than those expected in a
product of its high content on Fe-oo-EDDHA.
CaCO3 is the material with less reactivity,
followed by Montmorillonite and peat.
The three soils have a very similar behavior.
In natural soils, while in the purest chelate
only the 5 of the total initial iron is lost, in
the less pure ones, among the 45 of the added
iron is lost.

a) The purest chelates are those which maintain
more iron in solution for all materials.
b) There is no linearity, because Sequestrene,
which presents a very high excess of soluble iron
respect to the chelated one, and that
precipitates in the interaction, shows lower
recuperation percentages than those expected in a
product of its high content on Fe-oo-EDDHA.
CaCO3 is the material with less reactivity,
followed by Montmorillonite and peat.
The three soils have a very similar behavior.
In natural soils, while in the purest chelate
only the 5 of the total initial iron is lost, in
the less pure ones, among the 45 of the added
iron is lost.

For both Fe-oo-meso-EDDHA and Fe-oo-rac-EDDHA
there is a good correlation between its
remanaining amount after interaction with all the
materials and its presence in the product before
interaction, not existing with total iron.
Correlation is lower for the meso isomer and
theFerrydrite, due to the higher adsorption
observed for Sequestrene, respect to the expected
one.

RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
13
RESULTS AND DICUSSION Chelated iron
RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
14
RESULTS AND DICUSSION Chelated iron
RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
15
RESULTS AND DICUSSION Chelated iron
RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
16
RESULTS AND DICUSSION Distribution of Fe Soluble
and other product compounds

of each Fe compound remaining after interaction
with soil material

It is remarkable that the purest products show a
higher chelated-Fe recovery.
This is apparently incongruent with what it is
expected when adding increasing quantities of a
pure product (Hernández-Apaolaza, 1998), It is
necessary to take account of the high absorption
Iron hydroxide and oxides make.

It was pretended to study the PIV (Table),
because phenols and quinones could be harmful for
the soil.

The coefficient of correlation r between the
relative area and the chelate content is 0,671,
showing that more pure products, present less
of this compound and vice versa. The correlation
with the total iron of the products has no
significance (-0,121).
RESULTS AND DICUSSION Soluble Fe In all cases,
except for lime and Montmorrillonite (less active
materials), there is a good relation between the
percentage of chelated iron and the iron
remaining after interaction with soil materials.
19
RESULTS AND DICUSSION Distribution of soluble Fe
20
RESULTS AND DICUSSION Distribution of soluble Fe
21
RESULTS AND DICUSSION Distribution of Fe
compounds
Initial distribution of complexed Fe fractions
22
RESULTS AND DICUSSION Distribution of Fe
compounds
Initial distribution of complexed Fe fractions
23
CONCLUSIONS

It is evident that the only fertilizing value of
an iron EDDHA chelate is its content in
Fe-ortho-ortho-EDDHA.
Fe-op-EDDHA is scarcely able to maintain Fe after
three days of interaction with a relative small
quantity of soil and soil materials.
The less pure chelates suffer a bigger relative
retention than the more pure ones. Soluble
non-chelated iron precipitates in a very reactive
form of ferric hydroxide, which retains part of
the Fe-oo-EDDHA, specially the meso isomer.

24
CONCLUSIONS

A high copper solubilization appears in soils,
due in part, by the substitution of copper for
the soluble non-chelated iron.
Less pure products may contain even 20 times
more of synthesis byproducts of EDDHA, related
with the formation of pp-EDDHA and of quinones,
which do not add functional iron and which
effect could be harmful .