Agriculture Reference
In-Depth Information
Figure 7.1 Sampling location of water quality in the Rı´mac River basin
conducted by SEDAPAL (white dots) and DIGESA (black dots)
plants, enter the food chain and steadily accumulate in the organs of human
beings, resulting in chronic poisoning (Zhou et al, 2000). The World Health
Organization (WHO) guidelines on wastewater identify fecal coliform (FC)
bacteria as an indicator of fecal pollution in wastewater used in agriculture
and aquiculture (Mara and Cairncross, 1989).
The study included monthly data collection from the General
Environmental Health Directorate of the Ministry of Health (DIGESA) on Cd,
Cr, As, Pb and FC from 24 sampling stations between 2000 and 2004. Also,
we used annual data from the Drinking Water and Sewerage Service of Lima
(SEDAPAL) on Cd, As and Pb from 28 sampling stations between 1996 and
2004. It was dicult to obtain monthly data from SEDAPAL due to political
issues surrounding As contamination in water. Figure 7.1 shows the sampling
stations from both sources used in this research.
Mapping spatial-temporal water quality of the R´mac River
Each sampling station was geo-referenced through a global positioning system
(GPS). Spatial and temporal surfaces of water quality were created using
spatial analysis from ArcGIS 9.0. 2 Annual average numbers for each sample
station were used for interpolation. A buffer of 2000m around the Rı´ mac
River was defined in order to delimit the interpolated values, and the inverse
distance weighted (IDW) tool was used to interpolate the parameters for
water quality.
Search WWH ::




Custom Search