Pollution Characteristics Of Organophosphorus Flame Retardants And Mercury In Aquatic Environment Of The Yellow River In Henan Section

In this paper,the quantitative analysis of 10 kinds of organophosphorus flame retardants in aquatic environment and Hg in the sediment phase in Henan section of the Yellow River was carried out by using Agilent GC-MS and Milestone DMA-80 mercury analyzer.(1)The concentration range of total organic phosphorus flame retardant in the Henan section of the Yellow River water phase was 133.83-730.79 ng/L,the average concentration of 387ng/L,in which the predominant compositions were tris(2-chloroethyl)phosphate(TCEP),triethyl phosphate(TEP),tris(1-Chloro2-Propyl)phosphate(TCPP),tris(1,3-dichloro-2-propyl)phosphate(TDCP),accounting for 94.0% of the total organic phosphorus flame retardant concentration.The research shows that the YiLuo River(except TEP),the new Python River(except TEP)and Jindi River are the source of OPFRs in the main stream of the Yellow River.(2)The concentration range of total organic phosphorus flame retardant in the Henan section of the Yellow River suspended particulate phase was 6.53-6169 ng/g,the average concentration of 953ng/g,in which the predominant compositions were tri-o-tolyl phosphate(o-TCP),TCPP,TCEP,triphenyl phosphate(TPP),accounting for 93.2% of the total organic phosphorus flame retardant concentration.The research shows that the YiLuo River(except o-TCP),the new Python River and the Jindi River are the source of OPFRs in the main stream of the Yellow River.(3)The concentration range of total organic phosphorus flame retardant in the Henan sectionof the Yellow River sediment phase was 0.84-733 ng/g,the average concentration of 68.5 ng/g,in which the predominant compositions were o-TCP,TCPP,TCEP and TPP,accounting for 67.5%,14.7%,9.92% of the total organic phosphorus flame retardant concentration,respectively.The research shows that the YiLuo River and the Xin Python River are the source of OPFRs pollution in the Yellow River main stream,and the Jindi river is not the source of OPFRs in the main stream of the Yellow River.(4)OPFRs is easily distributed in the water phase,that is,the distribution characteristics of OPFRs in water phase,suspended phase and sediment phase are characterized by water phase>suspended particle phase>sediment phase.Compared with the research on organophosphorus flame retardants at home and abroad,the residue of organophosphorus flame retardants in the water environment in Henan section of the Yellow River is at the medium low water level.The spatial distribution and seasonal distribution characteristics and the distribution of dry and tributary of organophosphorous flame retardants in different boundary phase showed a significant difference.The results showed that the organic phosphorus flame retardants in Henan section of the Yellow River were seriously affected by the input of regional and seasonal organophosphorous flame retardants.It was found that there was a significant correlation between TDCP,TCPP and TCEP in the suspended particulate phase and sedimentary phase,indicating that there were similar sources of organic phosphorus flame retardant.(5)The concentration range of Mercury in the Henan section of the Yellow River sediment phase was 3.23-1413 ng/g,the average concentration of 75.9 ng/g,The apperent seasonal distribution was dry season>level period>wet period;the concentration of Mercury in dry season was significantlyhigher than tributary,showing that tributary was the main pollution source of dry season of Mercury;The correlation between Hg and TOC(Total Organic Carbon)and BC(Black Carbon)in the sediment phase of different periods showed that the concentration of Hg in the sediment phase was seriously affected by the seasonal effect.