Abstract:Effects of humic acid and cysteine on the biological dissolution and methylation of solid HgS by Shewanella oneidensis MR-1were studied. The results showed that the biological solubility of solid HgS was increased with the increasing humic acid concentration, and the concentration of dissolved HgS was 3.35mg/L at the humic acid concentration of 10mg/L. The biological methylation rate of HgS was rising at the humic acid concentration from 1 to 5mg/L, declining while the humic acid concentration from 5 to 10mg/L, and the highest methylation rate was about 10.55%. Cysteine added with different concentration had little influence on the biological solubility of solid HgS, but it could accelerate the methylation reaction process and increase the biological methylation rate of HgS by S. oneidensis MR-1up to 19.23%. The present study provided direct evidence for the biological dissolution and methylation of solid HgS by iron-reducing bacteria in the natural aquatic ecosystem.
陈艳, 黄潇, 司友斌. 腐殖酸和半胱氨酸对Shewanella oneidensis MR-1生物转化硫化汞的影响[J]. 中国环境科学, 2014, 34(2): 526-531.
CHEN Yan, HUANG Xiao, SI You-Bin. Effects of humic acid and cysteine on the biotransformation of HgS by Shewanella oneidensis MR-1. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(2): 526-531.