Heavy metals contamination in soils and selected edible parts of free-range local chicken|
Mbilu, Z.J. & Lyimo, M.E.
A study was carried out to determine the levels
of heavy metals [(arsenic (As), mercury (Hg), cadmium (Cd)
and lead (Pb)] contamination in soils and edible parts of
free-range local chicken (liver, muscle tissues and abdominal
fat) collected randomly in three locations viz Tabata,
Kigogo and Vingunguti located in Dar es Salaam city,
Tanzania. Concentration of Pb in soils ranged from 5.304 to
7.529, Cd from 0.046 to 0.055, Hg from 0.034 to 0.060 and
As from 0.239 to 0.329 ppm, respectively. Lead concentration
in soils differed significantly (P ≤ 0.05) between
locations. Differences in soil concentration of As, Hg and
Cd between locations were not significant (P > 0.05).
Heavy metal concentration in chicken parts differed significantly
between locations (P ≤ 0.05). High lead concentration
in chicken parts was registered in samples collected at
Tabata than at Kigogo and Vingunguti. As and Cd concentration
in soil and that in liver and Pb concentration in
soil and that in muscle tissues were positive and significant
correlated [(P ≤ 0.001) and (P ≤ 0.05)], respectively.
Negative significant (P ≤ 0.05) correlation was observed
between Hg concentration in soils and that in liver and
between As concentration in soils and Hg concentration in
muscle tissues. Results have shown that heavy metals contaminated
in soils may find route into different tissues and
organs parts of free-range local chicken; a health concern,
hence, calls for safe disposal of industrial and domestic
potential sources of heavy metal contamination in soils.
Liver; Abdominal fats; Muscle tissues; Soil contamination