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Hair burning and liming in tanneries is a source of pollution by arsenic, lead, zinc, manganese and iron

Version 2 2024-06-13, 12:39
Version 1 2019-02-18, 14:09
journal contribution
posted on 2024-06-13, 12:39 authored by MA Hashem, MS Nur-A-Tomal, NR Mondal, MA Rahman
© 2017, Springer International Publishing Switzerland. Heavy metals in the environment may be toxic for human and animals. Tanneries are a source of pollution by heavy metals. There is little information on heavy metals pollution in tanneries, especially on metals produced by the process of hair burning and liming. Liming is the first stage of chemical treatment where animal hair or wool is removed with sodium sulphide and calcium oxide. Here we studied cow, goat, buffalo and sheep hair, conventional liming agents and liming wastewaters from several sources. Samples were acid-digested and aliquots were analysed by atomic absorption spectroscopy following APHA standard method to measure concentrations of arsenic, lead, cadmium, zinc, manganese and iron. Results show that the range of metal contents in hair or wool and liming agents are 1.3–8.2 mg/kg for arsenic, 0.02–21.8 mg/kg for lead, 17.7–121.0 mg/kg for manganese, 7.3–141.1 mg/kg for zinc and 119.6–10613.8 mg/kg for iron. Liming wastewaters contain 1.9–5.6 µg/L arsenic, 0.03–6.05 µg/L lead, 38.6–139.0 µg/L manganese, 144.0–171.5 µg/L zinc and 399.5–1069.0 µg/L iron. Cadmium was below detection limits. This is the first investigation that reveals that hair burning liming operation is a potential source of heavy metals in the environment.

History

Journal

Environmental chemistry letters

Volume

15

Pagination

501-506

Location

New York, N.Y.

ISSN

1610-3653

eISSN

1610-3661

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2017, Springer International Publishing

Issue

3

Publisher

Springer

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