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

Table 3 Concentration of heavy metal (mg/kg) in filamentous algae samples in three out of eight sites

Site of samples collection	Heavy metals that were analyzed (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)
Railways lower	D1a (room dried)	0.093	166.27	72.70	0.95	0.41	27.80
Davis & Shirtliff	E1a (room dried)	0.075	176.69	23.70	0.46	0.26	9.30
Kartasi	F1a (room dried)	0.040	65.54	15.30	0.22	0.22	7.70
Kartasi	F1b (freeze dried)	0.020	33.97	7.30	0.14	0.08	13.00
Mean concentration (ppm or mg/kg)		0.057 ± 0.02	110.62 ± 35.79	29.75 ± 14.71	0.44 ± 0.18	0.24 ± 0.07	14.45 ± 4.59

^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. Samples of algae from Kartasi site were in large quantity and therefore were divided into two portions, and one portion was freeze-dried (F1b) while the remaining portion was room temperature dried (F1a) before metal analysis

ISSN: 2730-7182