Response between arsenic and environmental factors and risk assessment in Wuliangsuhai during the ice-bound period
Analyzed the distribution characteristics of arsenic(As)in ice-water-sediment multiphase media during the ice-bound period,this study took Lake Wuliangsuhai(WLSH)as the studied area.The main microbial community were revealed by high-throughput sequencing technology.Combined with physicochemical factors,its response relationship between As and environmental factors was explored and the key environmental factors were identified in WLSH during the ice-bound period.Meanwhile,assess the ecological risk of As in the surface sediments that used multiple methods.Concentrations of total arsenic(TAs)in the sediments in WLSH during the ice-bound period were higher than the background values of As in the Hetao plain,with an average concentration of 1.7times that of the background value.The main of As was As(V)in ice-water-sediment multiphase media during the ice-bound period in WLSH,and the maximum concentration of TAs appeared at total drainage.Combined with correlation analysis of multiphase media and Redundancy analysis,iron was the key environmental factor affecting the distribution of As in ice-water-sediment during the ice-bound period.Microorganisms play an important role,especially genera such as Thiobacillus,norank_f_Steroidobacteraceae and Bacillus.The risk assessment results indicating that the surface sediment are mostly slightly polluted in WLSH during the ice-bound period,but the total drainage has tended to moderate pollution and the surface sediment may have the risk of As toxicity.The potential ecological risk of As cannot be ignored in WLSH during the ice-bound period.
万方数据
维普
