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

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

Site of samples collection	Concentration of heavy metals that were analyzed (mg/l or mg/kg)
Site of samples collection	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

^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

ISSN: 2730-7182