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Heavy metals in collected water samples were analyzed. Table 2 shows the mean values found in this study for each metal, and the maximum reference values determined by CONAMA for Class 1, 2 and 3 waterbodies. CONAMA resolution 357 of 17 March, 2005 (CONAMA, 2008) does not set maximum values for total copper, although the maximum allowable concentrations of dissolved copper for Classes 1 and 2 is 0.009 mg.

Table 2

Average values of total heavy metals in Açude, Maria Lucinda and Santa Rosa streamlets, during rainy and dry periods and maximum mean values of metals allowed by CONAMA

Açude, Maria Lucinda streamlets
Santa Rosa streamlet
CONAMA maximum allowed level (mg/L)
Heavy metalRainy periodDry periodRainy periodDry periodStandard deviationaClass 1 and 2Class 3
Cadmium 0.001 0.01 
Lead 0.14 0.18 0.18 0.18 0.02 0.01 0.033 
Copper 0.82 4.25 0.33 1.67 1.75 0.009 0.013 
Chromium 0.96 0.8 0.98 0.92 0.46 0.05 0.05 
Manganese 43 55.89 49.33 48.5 5.28 0.1 0.5 
Nickel 0.72 0.83 0.87 0.83 0.064 0.025 0.025 
Zinc 5.28 b2.22 5.45 b3.18 1.589 0.18 
Açude, Maria Lucinda streamlets
Santa Rosa streamlet
CONAMA maximum allowed level (mg/L)
Heavy metalRainy periodDry periodRainy periodDry periodStandard deviationaClass 1 and 2Class 3
Cadmium 0.001 0.01 
Lead 0.14 0.18 0.18 0.18 0.02 0.01 0.033 
Copper 0.82 4.25 0.33 1.67 1.75 0.009 0.013 
Chromium 0.96 0.8 0.98 0.92 0.46 0.05 0.05 
Manganese 43 55.89 49.33 48.5 5.28 0.1 0.5 
Nickel 0.72 0.83 0.87 0.83 0.064 0.025 0.025 
Zinc 5.28 b2.22 5.45 b3.18 1.589 0.18 

aStandard deviation of the mean of all the measurements made for all locations in both seasons.

bBelow the values permitted by CONAMA.

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