Home > Research > Publications & Outputs > Zinc and lead detoxifying abilities of humic su...
View graph of relations

Zinc and lead detoxifying abilities of humic substances relevant to environmental bacterial species

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • LV Perelomov
  • B Sarkar
  • OI Sizova
  • KB Chilachava
  • AY Shvikin
  • IV Perelomova
  • YM Atroshchenko
<mark>Journal publication date</mark>30/01/2018
<mark>Journal</mark>Ecotoxicology and Environmental Safety
Number of pages6
Pages (from-to)178-183
Publication StatusPublished
<mark>Original language</mark>English


The effect of humic substances (HS) and their different fractions (humic acids (HA) and hymatomelanic acids (HMA)) on the toxicity of zinc and lead to different strains of bacteria was studied. All tested bacteria demonstrated a lower resistance to zinc than lead showing minimum inhibitory concentrations of 0.1 − 0.3 mM and 0.3–0.5 mM, respectively. The highest resistance to lead was characteristic of Pseudomonas chlororaphis PCL1391 and Rhodococcus RS67, while Pseudomonas chlororaphis PCL1391 showed the greatest resistance to zinc. The combined fractions of HS and HA alone reduced zinc toxicity at all added concentrations of the organic substances (50 – 200 mg L−1) to all microorganisms, while hymatomelanic acids reduced zinc toxicity to Pseudomonas chlororaphis PCL1391 at 200 mg L−1 organic concentration only. The HS fractions imparted similar effects on lead toxicity also. This study demonstrated that heavy metal toxicity to bacteria could be reduced through complexation with HS and their fractions. This was particularly true when the metal-organic complexes held a high stability, and low solubility and bioavailability.