Skip to main content

Table 5 Comparison of heavy metal concentrations (mg/kg) in laboratory- reared and field mosquitoes

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 sample collection/assortment

Heavy metals analyzed and their concentration (mg/kg)

Sample’s code

Hg (1.0)a

Pb (0.01)

Cr (0.1)

Cd (0.01)

Tl (0.02)

Ni (0.1)

Field samples

       

 Sinai (Mean)

G-m (Cx: larvae)

0.084

19.31

19.20

0.10

0.06

6.00

 Kartasi

F-m (Cx: adults)

0.031

1.73

2.00

0.06

 < 0.02

0.70

 Donholm

H-m (Cx: adults)

0.072

3.52

3.20

0.08

 < 0.02

1.00

 Assorted field samplesb

As-f (Cx: adults, larvae)

0.048

8.09

17.70

0.12

 < 0.02

1.60

 Mean ± SE (ppm)

 

0.059 ± 0.01

8.16 ± 3.95

10.53 ± .59

0.09 ± 0.01

0.03 ± 0.01

2.33 ± 1.24

Control samples

       

 Assorted laboratory samples

As-lc

0.260

4.89

4.40

1.80

 < 0.02

1.80

  1. aThe digit 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 was converted into mg/kg for consistency
  2. bAssorted field samples implies a mixture of adult mosquitoes and larvae trapped from the field
  3. cAssorted laboratory samples implies a mixture of laboratory reared adult Anopheles and Aedes mosquitoes and their larvae