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In order to monitor heavy metals in the water, SABESP analyzes the quality of the outlet water from WTP 3 every 6 months. The concentrations of elements (Al, As, Ba, Cd, Cr, Fe, Pb, S and F) in the past 3 years and the maximum allowable values (MAV) for human consumption, according to decree no. 2,914, of December 12, 2011, which regulates the procedures for control and monitoring of water quality for human consumption and potability standards (Brazil 2011), are presented in Table 2.

Table 2

Concentrations of Al, As, Ba, Cd, Cr, Fe, Pb, S and F, in biannual water analysis at WTP 3, and MAV for human consumption, either in ppm/L or mg/L

 Concentration (mg/L)
MAV (Brazil 2011)MAV (WHO 2011)
January 2013July 2013January 2014July 2014January 2015July 2015
Al <0.01 <0.01 <0.01 <0.01 0.03 0.04 0.2 – 
As <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 0.01 0.01 
Ba <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.7 0.7 
Cd <0.0040 <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 0.005 0.003 
Cr <0.001 <0.001 <0.007 <0.001 0.004 <0.001 0.05 0.05 
Fe <0.05 <0.10 <0.09 <0.05 <0.05 <0.15 0.3 – 
Pb <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 0.01 0.01 
S (SO42.25 3.00 2.55 1.70 1.63 – 250 – 
0.7 0.7 0.6 0.8 0.9 0.7 1.5 1.5 
 Concentration (mg/L)
MAV (Brazil 2011)MAV (WHO 2011)
January 2013July 2013January 2014July 2014January 2015July 2015
Al <0.01 <0.01 <0.01 <0.01 0.03 0.04 0.2 – 
As <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 0.01 0.01 
Ba <0.11 <0.11 <0.11 <0.11 <0.11 <0.11 0.7 0.7 
Cd <0.0040 <0.0012 <0.0012 <0.0012 <0.0012 <0.0012 0.005 0.003 
Cr <0.001 <0.001 <0.007 <0.001 0.004 <0.001 0.05 0.05 
Fe <0.05 <0.10 <0.09 <0.05 <0.05 <0.15 0.3 – 
Pb <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 0.01 0.01 
S (SO42.25 3.00 2.55 1.70 1.63 – 250 – 
0.7 0.7 0.6 0.8 0.9 0.7 1.5 1.5 

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