3. Methodology
A total of 30 springs and 3 drilled wells were sampled every two
months from November 2009 to July 2010. The selection of the locations
was based on their annual discharge, reflecting the overall
contribution of water supplied for human consumption in the studied
area (Fig. 2). In most cases a total of 7 samples were collected per
spring/well, totalizing 232 samples.
Temperature, pH, alkalinity titrations and electrical conductivity
measurements were conducted in the field during sampling with specific
portable equipment. Analytical work was developed in laboratory
using atomic absorption spectrometry for caption analysis and ion
chromatography for anion determination, in both cases after sample
filtration in the field with 0.45 μm filters. Samples for atomic absorption
analysis were acidified with suprapur nitric acid immediately
after sampling.
The ion-balance values (difference between the sum of cations
and the sum of anions in meq/L) show that 24.1% of the samples are
within ±5% interval, 54.3% within the ±10% interval and 21.6% within
the ±15% interval (mainly corresponding to the higher mineralized
samples).
3. MethodologyA total of 30 springs and 3 drilled wells were sampled every twomonths from November 2009 to July 2010. The selection of the locationswas based on their annual discharge, reflecting the overallcontribution of water supplied for human consumption in the studiedarea (Fig. 2). In most cases a total of 7 samples were collected perspring/well, totalizing 232 samples.Temperature, pH, alkalinity titrations and electrical conductivitymeasurements were conducted in the field during sampling with specificportable equipment. Analytical work was developed in laboratoryusing atomic absorption spectrometry for caption analysis and ionchromatography for anion determination, in both cases after samplefiltration in the field with 0.45 μm filters. Samples for atomic absorptionanalysis were acidified with suprapur nitric acid immediatelyafter sampling.The ion-balance values (difference between the sum of cationsand the sum of anions in meq/L) show that 24.1% of the samples arewithin ±5% interval, 54.3% within the ±10% interval and 21.6% withinthe ±15% interval (mainly corresponding to the higher mineralizedsamples).
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