G36 



DATA OF GEOCHEMISTRY 



Table 69. — Analyses, in parts per million, of water from French 

 West Africa 



[These data are from unpublished work carried out by the Service Geologique of 

 French West Africal 



' Includes iron, both determined as oxides, so this converted figure may be slightly 

 too low. 



A. Senegal River at Kayes. Auk. 26, 1955. 



B. Sangalcam River near Dakar. Mar. 15, 1956. 



C. Marigot Lue River at Beyla. Mean of 2 analyses, Feb. 27, 28, 1957. 



D. Konkoure River at Sonapiti. Apr. 20, 1957. 



E. KonkourS River at Kabea. Mean of 7 analyses, Jan. and Apr. 1954. 



F. Oua-Oua River at Kindia. Dec. 2, 1954. 



G. Niger River at Kourassa. Dec. 10, 1954. 



H. Niger River at Niamey. Mean of 3 analyses, Mar. 5, 1951 and Mar. 5, 1953 



Table 70. — Analyses, in milligrams per liter, of water from 



Algeria 



[All analyses are from unpublished reports made available by the Service des Etudes 

 Scientifiques of the Ministere de l'Algerie] 



' Nitrate figures represent means of a smaller number of analyses than the major 

 ions. 



A. Oued Mekerra at Chanzy, mean of 40 analyses, 1950-54. 



B. Oued Sebaou at Pont de Bougie, mean of 150 analyses, 1949-53. 



C. Oued el Hammam at Trois Rivieres, mean 01 20 analyses, 1953. 



D. Oued Bou Namoussa at La Chelfia, mean of 20 analyses, 1946-52. 



E. Oued Kebir de l'Est at Yusuf, mean of 20 analyses, 1951-53. 



F. Oued Chen at Medjez-Amar, mean of 22 analyses, 1951-53. 



G. Oued Mazafran at Pont du Fer a Cheval, mean of 30 analyses, 1950. 

 H. Oued Chelif at Charron, mean of 21 analyses, 1953. 



Some additional information about the composition 

 of the waters of Africa may be found in the partial 

 analyses of Harrison and Elsworth (1958), Hutchinson, 

 Pickford, and Schuurman (1932), Macfadyen (1952), 

 and Baker (1958). 



SOUTH AMERICA 



The waters of South America are very inadequately 

 known, although they have been investigated sporad- 

 ically for almost a century. For many of the rivers, 

 particularly the southern ones, there are no better data 

 available than the ones which were presented in the 

 last edition of this book. For the northern rivers there 

 exists a large amount of new data — (see for example, 

 Bonazzi (1950) and Bond (1935))— but most of the 

 published analyses are incomplete. 



Some analyses for the water of Venezuela are pre- 

 sented in table 71. The Lago de Maracaibo shows the 

 influence of sea salt. The Orinoco is a typical river of 

 the humid tropics, except for being a little high in 

 sodium and a little low in silica. As was the case with 

 Bosumtwi in Ghana, the lakes are considerably more 

 concentrated than the rivers. 



Considerable progress is being made with the study 

 of the waters of Peru. The object of these studies 

 seems to be practical rather than geochemical, and, 

 unfortunately for present purposes, most of the atten- 

 tion is being given to ground-water supphes, but the 

 analj'ses of these are remarkably detailed, and a few 

 surface waters also have been analyzed completely. 

 Three of these are presented in table 72 along with some 

 miscellaneous analyses recalculated from the previous 

 edition of this book. The analysis of the Laguna 

 Encantada suggests marine contamination. Lagoa 

 Escondida, though concentrated, is far from the sea 

 and its high sodium and chloride content is probably 

 due to evaporation with precipitation of less soluble 



Table 71. — Analyses, in parts per million, of water from Venezuela 

 [All data from unpublished analyses of the Direcion de Geologia of the Ministerio de Minas e Hidrocarburos of Venezuela] 



A. Lago de Maracaibo, Feb. 14, 1952. 



B. Lago de Maracaibo, Sept. 2, 1952. 



C. Rio Orinoco at Puerto Ayacuho, Apr. 11, 1953. 



D. Lago at Valencia, 200 m from the coast, Apr. 14, 1956. 



E. Laguna de Valencia, north of Isla de Candamo, Sept. 13, 1950. 



F. Rio Ouarico, Sept. 21, 1954. 



G. Rio Coiedes, near the new Rio Cojedes bridge, Nov. 18, 1953. 



H. Rio Portuguesa, Nov. 20, 1953. 



I. Motatan Rio, Dec. 22, 1949. 



J. Escalante Rio. Nov. 17, 1952. 



K. Chama Rio, Nov. 27, 1952. 



L. Rio Yaracuy, Dec. 21, 1956. 



