A "fração argila" dos solos do Estado de São Paulo e seu estudo roentgenográfico

Paiva Neto, J. E. de

doi:10.1590/S0006-87051942001000001

Resumo

In the beginning of this work a brief idea was given on what is understood as "clay", on the scientific methods applied to the study of the matter "clay" as well as on its conception with regard to the edaphic studies. A description is given of the methods of total and natural mechanical analyses which were employed in the agro-geological Department. The work is illustrated by a graphic showing the fractions of the mechanical analysis of the chief great soil types of the State of São Paulo. The fraction clay is then studied by chemical way in the following sequence : 1.° total chemical analysis, 2.° partial chemical analysis, 3.° chemical analysis of the Helmholz layer and 4.° study of the fixation of the ion Ca+ + in the already mentioned Helmholz layer. The first analysis separates and attacks the hydrated aluminium silicates, the hydrated oxyds of iron and aluminium, manganese, etc. In this analysis the relationship between silica and sesquioxyds was determined. The second type of attack or chemical analysis does not affect the hydrated silicates of aluminium, all others go in dissolution. In this analysis were determined chiefly the sesquioxyds in their free form in the clay complex. For the study of the Helmholz layer, i.e. the determination of changeable ions, solutes of NH4Cl N/l, HNO3 N/5, KCl N/l, etc. were used, percolation of these liquids being made through a layer of air dried soil. The relationship between soil and liquid was always 1:10. In this analysis, principally the cations K+, Ca++, Mg++, Al+ + +, H+ etc. were determined. With such determinations the calculations of the following values were obtained: S = sum of the changeable bases in ME; T = total value in ME of the sorptive power of the complex in each 100 g dried soil at 110° C. and V = percentage of saturation of the complexes with bases. Finally, the qualitative radiographic analysis of the fraction clay was carried out by means of the Debye-Scherrer-Hull method. For these studies the Siemens-Berlin apparatus was used, the transformer of which runs with all0-220 volts 60-cycle alternating current. The bulb has a copper anti-cathode and is fed by a current of 13 m.A. of intensity and the difference of potential is of 30,000, 35,000 and 47,000 volts. The flash of X-rays goes through the nickel filter in order to free it of the b irradiations which are deleterious. In this way, inciding vertically on the preparation, radiations CuK a with l = 1,539 A are obtained. The sensible film used was a Lawe-Film-Agfa, with an exposure going from 11/2 to 2 hours with 35,000 V. The chassis has a diameter of 57 mm. More than 500 radiographs of soil samples were taken, of those proceding from all districts of the State, 79 of which are presented in the present work. With this material the different constituents of the clay minerals contained in our soils were known. Thus, in the soils over the Archean geological formation, kaolinite is represented most frequently and abundantly ; the hydrargillite also appears commonly. The soils over the Glacial formation contain the same representatives and oscillations as those just mentioned. In the Corum-batai formation, quartz is the most important constituent. The Botucatu formation (lava) is that which gave origin to our legitimate red soils ; the mineralogical clay constituents of these soils are : 1.° large amount of hydrated oxyds of iron up to 35% of Fe2O3 for each 100 g of soil at 110° C. ; 2.° hydrargillite and 3.° kaolinite. The amount of the latter in the clay complex ranges between 9 and 25%. The sandy soils existing in the geological formations of lower and upper Baurú bear in their clays the following mineralogical constituents : 1.° kaolinite, 2.° montmorrillonitic type (on the upper Baurú only), 3.° hydrargillite (more common on the lower Baurú) and 4.° quartz, generally, in small percentages. These researches made it evident that the constituents of the clay fraction of our soils commonly have a small sorptive power related to the cations; it follows hence that they do not show a great power of retention of manure with the exception of the montmorrillonitic type.

A "fração argila" dos solos do Estado de São Paulo e seu estudo roentgenográfico(^* (* ) Trabalho a ser apresentado no 2.° Congresso Brasileiro de Química a realizar-se em Curitiba, de 26 a 31 de janeiro de 1943. )

J. E. de Paiva Neto

SUMMARY

In the beginning of this work a brief idea was given on what is understood as "clay", on the scientific methods applied to the study of the matter "clay" as well as on its conception with regard to the edaphic studies. A description is given of the methods of total and natural mechanical analyses which were employed in the agro-geological Department.

The work is illustrated by a graphic showing the fractions of the mechanical analysis of the chief great soil types of the State of São Paulo.

The fraction clay is then studied by chemical way in the following sequence : 1.° total chemical analysis, 2.° partial chemical analysis, 3.° chemical analysis of the Helmholz layer and 4.° study of the fixation of the ion Ca+ + in the already mentioned Helmholz layer.

The first analysis separates and attacks the hydrated aluminium silicates, the hydrated oxyds of iron and aluminium, manganese, etc. In this analysis the relationship between silica and sesquioxyds was determined.

The second type of attack or chemical analysis does not affect the hydrated silicates of aluminium, all others go in dissolution. In this analysis were determined chiefly the sesquioxyds in their free form in the clay complex. For the study of the Helmholz layer, i.e. the determination of changeable ions, solutes of NH₄Cl N/l, HNO₃ N/5, KCl N/l, etc. were used, percolation of these liquids being made through a layer of air dried soil. The relationship between soil and liquid was always 1:10. In this analysis, principally the cations K+, Ca++, Mg++, Al+ + +, H+ etc. were determined. With such determinations the calculations of the following values were obtained: S = sum of the changeable bases in ME; T = total value in ME of the sorptive power of the complex in each 100 g dried soil at 110° C. and V = percentage of saturation of the complexes with bases.

Finally, the qualitative radiographic analysis of the fraction clay was carried out by means of the Debye-Scherrer-Hull method. For these studies the Siemens-Berlin apparatus was used, the transformer of which runs with all0-220 volts 60-cycle alternating current. The bulb has a copper anti-cathode and is fed by a current of 13 m.A. of intensity and the difference of potential is of 30,000, 35,000 and 47,000 volts. The flash of X-rays goes through the nickel filter in order to free it of the b irradiations which are deleterious.

In this way, inciding vertically on the preparation, radiations CuK a with l = 1,539 A are obtained. The sensible film used was a Lawe-Film-Agfa, with an exposure going from 11/2 to 2 hours with 35,000 V. The chassis has a diameter of 57 mm. More than 500 radiographs of soil samples were taken, of those proceding from all districts of the State, 79 of which are presented in the present work. With this material the different constituents of the clay minerals contained in our soils were known. Thus, in the soils over the Archean geological formation, kaolinite is represented most frequently and abundantly ; the hydrargillite also appears commonly. The soils over the Glacial formation contain the same representatives and oscillations as those just mentioned. In the Corum-batai formation, quartz is the most important constituent.

The Botucatu formation (lava) is that which gave origin to our legitimate red soils ; the mineralogical clay constituents of these soils are : 1.° large amount of hydrated oxyds of iron up to 35% of Fe₂O₃ for each 100 g of soil at 110° C. ; 2.° hydrargillite and 3.° kaolinite. The amount of the latter in the clay complex ranges between 9 and 25%. The sandy soils existing in the geological formations of lower and upper Baurú bear in their clays the following mineralogical constituents : 1.° kaolinite, 2.° montmorrillonitic type (on the upper Baurú only), 3.° hydrargillite (more common on the lower Baurú) and 4.° quartz, generally, in small percentages. These researches made it evident that the constituents of the clay fraction of our soils commonly have a small sorptive power related to the cations; it follows hence that they do not show a great power of retention of manure with the exception of the montmorrillonitic type.

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LITERATURA CITADA

1. Wiegener, G. Em Boden und Bodenbildung, 3.Ş edição, pg. 1-98, fig. 1-10, Von Theodor Steinkopff. Dresden e Leipzig, 1924.
2. Zsigmondy, R. Em Coloidequímica, pg. 9-184. Traduzido do alemão para o espanhol por E. Moles. "Calpe" Madrid Barcelona, 1927.
3. Friedrich-Vincenz v. H. Em Dispersoidanalyse, pg. 1-36, fig. 1-165, tab. 1-110, Von Theodor Steinkopff. Dresden e Leipzig, 1928.
4. Kruyt, H. R. Em Les Colloides pg, 3-203. Traduzido do francês, para o inglês por J. Du Plessis de Grenédan. Felix Alean Paris, 1933.
5. Van Buzágh, A. Em Kolloidik pg. 1-174, fig. 1-68, tab. 1-18. Von Theodor Steinkopff. Dresden e Leipzig, 1936.
6. Hauser, E. A. Colloid chemistry in Ceramic The Journal and Ceramic Abstracts 24: 179-189, fg. 1-15, tab. 1-3, 1941.
7. Paiva Neto Percolação ou agitação na química dos complexos sortivos do solo. Bragantia 2: 93-99, fig. l-X-3, 1942.
8. Vageler, P. Em Der Kationen-und Wasserhaushalt des Mineralbodens, og. 40-83, fig. 1-34, Julius Springer, Berlin, 1932.
9. Renold, A. Kationenaustausch an Permutiten, insbesondere an Wasserstoff und Schwermetallpermutiten, Kolloid-Beihefte, 43: 1-142, fig. 1-9, 1935.
10. Cernescu, N. C. Kationenumtausch und Struktur. Anuarul Institutulin Geologic al Romcinei M. O. Imprimeria Nationalã Bukarest 1931: 1-89, 1933.
11. Lavolloy, J. Em Le Magnesium dans les terres arables, pg. 101, Hermann & Cia., Paris, 1936.
12. Blanck, E. Em Handbuch der Bodenlehre, vol. VIII : 1-714. Verlag von Julius Springer, Berlin, 1930.
13. Schachtschabel, P. Untersuchungen uber die Sorption der Tonmineralien und anorganischen Bodenkolloide und die Bestimmung des Anteils dieser Kolloide an der Sorption im Boden, Kolloid. Beihefte 51: 199-276, pg. 1-12, 1940.
14. Hauser, E. A. Em Colloidal Phenomena, pg. 1-294, fg. 1-123, McGraw-Hill Book Company Inc. New York e Londres, 1939.
15. Endell, K. Pesquisa radioscópica de argilas e sua importância técnico-econômica. Bol. Téc, Inst. Agr. do Estado de S. Paulo, 31: -.25-40.
16. Bragg, W. L. Em The Structure of Silicates, pg. 1-78, fg. 1-27, Akademische Verlagsgesellschaft M. B. H. Leipzig, 1932.
17. Hofmann, U., K. Endell, und W. Bilke, Die Quellung von Bentonit und seine Technische Anwendung Zeitschrift fur Elektrochemie 41: 469-471, 1935.
18. Maegdefrau, E., U. Hofmann, Glimmerartige Mineralien ais Tonsubstanzen. Z. Kristallogr. (A). 98: 31-59, 1937.
19. Brandley, W. F., R. E. Grimm, and G. L. Clark, A Study of the Behavior of Montmorrilonite upon Wetting. Z. Kristallogr. (A) 97: 216-222, 1937.
20. Grim, R. E., R. H. Bray, and W. F. Brandley, The Mica in Argilaceous Sediments. The American Mineralogist 22: 813-829, 1937.
21. Grim, R. E. and R. H. Bray, The mineral constitution of various ceramic clays. Journal of the American Ceramic Society 19: 308-315, 1936.
22. Endell, K. und P. Vageler, Der Kationen- und Wasserhaushalt Keramischer Tone in rohen Zustand Berichte der Deutschen Keramischen Gesellschaft 13: 377-411, 1932.
23. Endell, K., H. Fendius, und U. Hofmann, Basenaustauschfaehigkeit von Tonen und Formgebungsprobleme in der Keramik Berichte der Deutschen Keramischen Gesellschaft. 15: 595-625, 1934.
24. Grim, R. E., R. H. Bray, and W. F. Brandley, The constitution of Bond Clays and Its Influence on Bonding Properties, Trans. Amer. Foundreymen's Assoc. VII: 211-228, 1936.
25. Ekblaw, G. E. and R. E. Grim, Some geological relations between the constitution of soil materials and Highway construction. Report of investigations, n.° 42, pg. 5-16, fig. 1-4, Division of State Geological Survey, Urbana. Illinois. 1936.
26. Paiva Neto, J. E. de Argilas do tipo montmorrilonítico nos solos do Estado de São Paulo. Mineração e Metalurgia. VI :87 fig. 1-4. 1941.

(*

) Trabalho a ser apresentado no 2.° Congresso Brasileiro de Química a realizar-se em Curitiba, de 26 a 31 de janeiro de 1943.

Datas de Publicação

Publicação nesta coleção
29 Jun 2010
Data do Fascículo
1942

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] 1. Wiegener, G. Em Boden und Bodenbildung, 3.Ş edição, pg. 1-98, fig. 1-10, Von Theodor Steinkopff. Dresden e Leipzig, 1924.

[2] 2. Zsigmondy, R. Em Coloidequímica, pg. 9-184. Traduzido do alemão para o espanhol por E. Moles. "Calpe" Madrid Barcelona, 1927.

[3] 3. Friedrich-Vincenz v. H. Em Dispersoidanalyse, pg. 1-36, fig. 1-165, tab. 1-110, Von Theodor Steinkopff. Dresden e Leipzig, 1928.

[4] 4. Kruyt, H. R. Em Les Colloides pg, 3-203. Traduzido do francês, para o inglês por J. Du Plessis de Grenédan. Felix Alean Paris, 1933.

[5] 5. Van Buzágh, A. Em Kolloidik pg. 1-174, fig. 1-68, tab. 1-18. Von Theodor Steinkopff. Dresden e Leipzig, 1936.

[6] 6. Hauser, E. A. Colloid chemistry in Ceramic The Journal and Ceramic Abstracts 24: 179-189, fg. 1-15, tab. 1-3, 1941.

[7] 7. Paiva Neto Percolação ou agitação na química dos complexos sortivos do solo. Bragantia 2: 93-99, fig. l-X-3, 1942.

[8] 8. Vageler, P. Em Der Kationen-und Wasserhaushalt des Mineralbodens, og. 40-83, fig. 1-34, Julius Springer, Berlin, 1932.

[9] 9. Renold, A. Kationenaustausch an Permutiten, insbesondere an Wasserstoff und Schwermetallpermutiten, Kolloid-Beihefte, 43: 1-142, fig. 1-9, 1935.

[10] 10. Cernescu, N. C. Kationenumtausch und Struktur. Anuarul Institutulin Geologic al Romcinei M. O. Imprimeria Nationalã Bukarest 1931: 1-89, 1933.

[11] 11. Lavolloy, J. Em Le Magnesium dans les terres arables, pg. 101, Hermann & Cia., Paris, 1936.

[12] 12. Blanck, E. Em Handbuch der Bodenlehre, vol. VIII : 1-714. Verlag von Julius Springer, Berlin, 1930.

[13] 13. Schachtschabel, P. Untersuchungen uber die Sorption der Tonmineralien und anorganischen Bodenkolloide und die Bestimmung des Anteils dieser Kolloide an der Sorption im Boden, Kolloid. Beihefte 51: 199-276, pg. 1-12, 1940.

[14] 14. Hauser, E. A. Em Colloidal Phenomena, pg. 1-294, fg. 1-123, McGraw-Hill Book Company Inc. New York e Londres, 1939.

[15] 15. Endell, K. Pesquisa radioscópica de argilas e sua importância técnico-econômica. Bol. Téc, Inst. Agr. do Estado de S. Paulo, 31: -.25-40.

[16] 16. Bragg, W. L. Em The Structure of Silicates, pg. 1-78, fg. 1-27, Akademische Verlagsgesellschaft M. B. H. Leipzig, 1932.

[17] 17. Hofmann, U., K. Endell, und W. Bilke, Die Quellung von Bentonit und seine Technische Anwendung Zeitschrift fur Elektrochemie 41: 469-471, 1935.

[18] 18. Maegdefrau, E., U. Hofmann, Glimmerartige Mineralien ais Tonsubstanzen. Z. Kristallogr. (A). 98: 31-59, 1937.

[19] 19. Brandley, W. F., R. E. Grimm, and G. L. Clark, A Study of the Behavior of Montmorrilonite upon Wetting. Z. Kristallogr. (A) 97: 216-222, 1937.

[20] 20. Grim, R. E., R. H. Bray, and W. F. Brandley, The Mica in Argilaceous Sediments. The American Mineralogist 22: 813-829, 1937.

[21] 21. Grim, R. E. and R. H. Bray, The mineral constitution of various ceramic clays. Journal of the American Ceramic Society 19: 308-315, 1936.

[22] 22. Endell, K. und P. Vageler, Der Kationen- und Wasserhaushalt Keramischer Tone in rohen Zustand Berichte der Deutschen Keramischen Gesellschaft 13: 377-411, 1932.

[23] 23. Endell, K., H. Fendius, und U. Hofmann, Basenaustauschfaehigkeit von Tonen und Formgebungsprobleme in der Keramik Berichte der Deutschen Keramischen Gesellschaft. 15: 595-625, 1934.

[24] 24. Grim, R. E., R. H. Bray, and W. F. Brandley, The constitution of Bond Clays and Its Influence on Bonding Properties, Trans. Amer. Foundreymen's Assoc. VII: 211-228, 1936.

[25] 25. Ekblaw, G. E. and R. E. Grim, Some geological relations between the constitution of soil materials and Highway construction. Report of investigations, n.° 42, pg. 5-16, fig. 1-4, Division of State Geological Survey, Urbana. Illinois. 1936.

[26] 26. Paiva Neto, J. E. de Argilas do tipo montmorrilonítico nos solos do Estado de São Paulo. Mineração e Metalurgia. VI :87 fig. 1-4. 1941.