European Journal of Scientific Research - EuroJournals

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.