Groundwater flow systems and fluoride content in the water of Tenextepango, Morelos, Mexico
Por:
Huizar-Alvarez, R, Varela-Gonzalez, GG, Jaramillo, ME
Publicada:
1 ago 2014
Categoría:
Geology
Resumen:
In Tenextepango region, Morelos state, the fluoride content in drinking
groundwater population varies from 0.3 to 1.9 mg/L, highest fluoride
content is observed in located wells in the northeast sector. Therefore,
the objective of this study is to identify: (i) the groundwater flow
systems involved and (ii) which groundwater flow system has highest
fluoride content. Chemical analysis results of extracted groundwater
were used as well as groundwater field temperature, stable isotope
content and tritium. Data permit to identify possible relationship
between fluoride content and the hierarchy of the groundwater flow
system type as well as to identify the recharge zone. Fluoride content
and water temperature are higher in wells that extract water
continuously, and are lower in wells that pump water about seven
hrs/day. delta H-2, tritium and delta O-18 content, shows two types of
groundwater flow system. The first corresponds to an enriched water,
delta H-2 -66 parts per thousand and delta O-18 - 8.2 parts per thousand
to recharged at low altitude about 2,500 meters. The tritium content
varies between 1.1 +/- 0.7 y 2.4 +/- 0.6 TU indicating the existence of
water with residence time less than 40 years, associated with a
relatively recent local flow whose temperature is 23 to 25 degrees C.
The second corresponds to a depleted water content of-71 parts per
thousand delta H-2 and delta O-18 -9.9 parts per thousand, compared to
the previous one, recharged to a higher altitude about 3,500 m a.s.l.;
while tritium content is <0.8 +/- 0.6 TU, and a well head temperature of
25 to 33 degrees C, suggesting a residence time older than 40,
associated to a flow of local-intermediate type. Also, these values
indicate that extracted water in these wells is a mixture of old water
with younger water, and the higher fluoride content is mainly present in
the local-intermediate flow.
Filiaciones:
Huizar-Alvarez, R:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Varela-Gonzalez, GG:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Jaramillo, ME:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
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