Metal extent in blood of livestock from Dandora dumping site, Kenya: Source identification of Pb exposure by stable isotope analysis

Hokuto Nakata; Shouta M M Nakayama; Yoshinori Ikenaka; Hazuki Mizukawa; Chihiro Ishii; Yared B Yohannes; Satoru Konnai; Wageh Sobhy Darwish; Mayumi Ishizuka

doi:10.1016/j.envpol.2015.05.003

Metal extent in blood of livestock from Dandora dumping site, Kenya: Source identification of Pb exposure by stable isotope analysis

Environ Pollut. 2015 Oct:205:8-15. doi: 10.1016/j.envpol.2015.05.003. Epub 2015 May 19.

Authors

Hokuto Nakata¹, Shouta M M Nakayama¹, Yoshinori Ikenaka², Hazuki Mizukawa³, Chihiro Ishii¹, Yared B Yohannes⁴, Satoru Konnai⁵, Wageh Sobhy Darwish⁶, Mayumi Ishizuka⁷

Affiliations

¹ Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan.
² Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan; Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa.
³ Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan.
⁴ Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan; Department of Chemistry, College of Natural and Computational Science, University of Gondar, P.O. Box 196, Gondar, Ethiopia.
⁵ Laboratory of Infectious Diseases, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan.
⁶ Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan; Food Control Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.
⁷ Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo 060-0818, Japan. Electronic address: ishizum@vetmed.hokudai.ac.jp.

PMID: 25997160
DOI: 10.1016/j.envpol.2015.05.003

Abstract

Nairobi city in Kenya produces 2000 tons/day of garbage, and most of it is dumped onto the Dandora dumping site, home to a quarter-million residents. This study was conducted (1) to assess the contamination levels of nine metals and a metalloid (arsenic) in the blood of pigs, goats, sheep and cattle from Dandora, and (2) to identify a possible source of lead (Pb) pollution. Cadmium (Cd, 0.17-4.35 μg/kg, dry-wt) and Pb (90-2710 μg/kg) levels in blood were generally high, suggesting human exposure to Cd through livestock consumption and Pb poisoning among pigs (2600 μg/kg) and cattle (354 μg/kg). Results of Pb isotope ratios indicated that the major exposure route might differ among species. Our results also suggested a possibility that the residents in Dandora have been exposed to the metals through livestock consumption.

Keywords: Dandora; Dumping site; Livestock; Metal contamination; Stable Pb isotopes.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Animals
Arsenic / blood*
Cattle
Environmental Monitoring*
Environmental Pollutants / blood*
Goats / blood
Isotopes / blood
Kenya
Livestock / blood*
Metals / blood*
Sheep / blood
Species Specificity
Swine / blood

Substances

Environmental Pollutants
Isotopes
Metals
Arsenic