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Table 4 Statistical comparison of levels of heavy metals in filamentous algae and wastewater at Kartasi sampling site

From: Urban mosquitoes and filamentous green algae: their biomonitoring role in heavy metal pollution in open drainage channels in Nairobi industrial area, Kenya

Site of samples collection Concentration of heavy metals that were analyzed (mg/l or mg/kg)
Sample’s code Hg (1.0)a Pb (0.1) Cr (0.5) Cd (0.05) Tl (0.01) Ni (0.2)
Filamentous algae (mg/kg)
 Kartasi (sample 1) F1a (room dried) 0.040 65.54 15.30 0.22 0.22 7.70
 Kartasi (sample 2) F1b (freeze dried) 0.020 33.97 7.30 0.14 0.08 13.00
 Mean concentration ± SE 0.03 ± 0.01 49.76 ± 15.79 11.30 ± 4.00 0.18 ± 0.04 0.15 ± 0.07 10.35 ± 2.65
Wastewater (mg/l)        
 Kartasi (sample 1) F1 0.00010 0.0173 0.0014 0.00008 0.00003 0.0065
 Kartasi (sample 2) F2 0.00010 0.0106 0.0011 0.00007 0.00004 0.0036
 Kartasi (sample 3) F3 0.00010 0.0001 0.0065 0.00005 0.00001 0.0002
 Mean concentration ± SE 0.0001 ± 0.00 0.0093 ± 0.005 0.0030 ± 0.002 0.0001 ± 0.00 0.00003 ± 0.00 0.0034 ± 0.001
Significance levels       
 ANOVA test: F (11, 24) = 4.33, P < 0.05       
  1. aThe value in bracket shows the method detection limits (MDL) measured in mg/kg except for Hg which was in µg/kg. However, the data for Hg has been converted to mg/kg for consistency