Influence of Water Hardness on Silver Ion and Silver Nanoparticle Fate and Toxicity Toward Nitrosomonas europaea.

ABSTRACT: This study investigated the influence of water hardness (Mg²⁺ and Ca²⁺) on the fate and toxicity of 20 nm citrate silver nanoparticles (AgNPs) and Ag⁺ toward Nitrosomonas europaea, a model ammonia-oxidizing bacterium. Nitrification inhibition of N. europaea by 1 ppm AgNPs and 0.5 ppm Ag⁺ was reduced from 80% and 83%, respectively, in the absence of Mg²⁺ to 2% and 33%, respectively, in the presence of 730 μM Mg²⁺. Introduction of Mg²⁺ resulted in the rapid aggregation of the AgNP suspensions and reduced the 3 h Ag⁺ dissolution rates from 30%, in the absence of Mg²⁺, to 9%, in the presence of 730 μM Mg²⁺. Reduced AgNP dissolution rates resulted in decreased concentratio

SUBMITTER: Anderson JW 

PROVIDER: S-EPMC4098081 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature