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Toxicity of Arsenic in the Ground Water of Comarca-Lagunera (Mexico) 876 The points observed show a high dispersion. The most diluted waters are characterized by a calcic carbonated type. When water concentrates, it evolves to a sodic sulphated type. The general evolution corresponds to a neutral saline type. Statistical Approach on chemical variability The convenience of separate treatment for each watershed will be demonstrated in the next discussion. Statistical approach will take into account of this choice. ACP The first factorial plan of the ACP analysis represents more than the half (59%) of the data information with the following highlights: The first axis determines the maximum of inertia (41%). In this axis the electric conductivity, is opposed to low soluble and low controlled elements. This result is usual in arid and salt environments. The arsenic as well as sodium and sulphate concentrate while water evaporates in arid climate; water increases mineral content. This partially explains the high arsenic concentration in water. The arsenic in solution is low controlled and has a geochemical behaviour like soluble salt. Chloride and sodium as well as pH are in an intermediate position (figure 4). The second axis, opposes arsenic to sulphate with alkalinity. It acts of an axis translating the importance of mineralisations of major origin (sulphides, arsenides) in lithology. The abundance of arsenic is associated that of the SO4. The deterioration of sulphides produces acidity which consumes alkalinity from where the Alc opposition/SO4 + As (figure 5). As regards principal component analysis applied to the second line flow, i.e. strong arsenic contents, the first axis of this representation determines the maximum of inertia (48.4%). As for the other line of flow, it acts of a climatic axis which opposes to conductivity opposes a very located group: arsenic, sulphates, sodium, calcium and electric conductivity with copper, lead, zinc and alkalinity. Arsenic is not controlled, it behaves like a soluble salt (a behavior of a tracer), it concentrates with the evaporation of water. For this line of flow, the importance of the climatic aridity on the quality of water is a little stronger than for the other line of flow. Axis 2 opposes to lead, arsenic, sulphates with pH. As for the other line of flow, it acts of an effect of lithology. For this line of flow, the importance of the climatic aridity on the quality of water is a little stronger than for the other line of flow. Metals, arsenic and SO4 have the same origin, i.e. a major origin probably related to the mineral increase associated volcanicity. As regards the ACP STATE applied to the globality of the samples of water, i.e. for the two lines of flow confused, the results are comparable, but the inertia of the climatic axis decreases with the profile of the lithological axis. This result shows that the two lines of flow are thus characterized by a lithology the different upstream which generates at the beginning of the different contents arsenic, then evaporation concentrates arsenic in the two lines of flow.
877 Faten Semadi, Vincent Valles and Jose Luis Gonzalez Barrios Figure 4: Analyzes factorial correspondences of the various elements (First line of flow) Figure 5: Analyzes factorial correspondences of the various elements (Second line of flow) Figure 6: Distribution of the frequencies of the two arsenic pennies groups of the As/SO4 report/ratio Sulphate seems to be the most mobile element and nearest to electric conductivity. It could be used as a concentration tracer.
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