Study Of Evaluation Of Heavy Metals In Sediment From Duchuan Section In Gubin River Of Guangxi

Gubin river which is located in the west of Huanjiang Maonan AutonomousCounty (Huanjiang county for short) is one of the main tributaries of GreatHuanjiang river. It was the mainly lead-zinc producer of Huanjiang county from1970s to the early21st century because of rich resources of lead-zinc mine.Butresources are wasted and rivers are contaminated of heavy metals to some extent putdown to the small production scale and the low specialization. Moreover, dischargingwaste water and waste residue of mineral irrationality is another important reason. Inorder to making up for blanks of the data of environmental monitoring that Gubinriver have been missed before. The paper acquisitioned and monitored of the sedimentfrom four tributaries of Gubin river. Not only hope to strengthen the consciousness ofprotecting the fluvial environment of Gubin river, but also providing a reasonablebasis for the management work of Gubin river by evaluating heavy metals pollution ofthe river.This text divided Gubin river into four survey regions by their different primaryfunctions. Such as Gubinheganliu is the river of mining industry, Caifan rive is theriver of living quarters, Hedun river is the river of agricultural region and Miaoshiriver is the rive of background zone. First of all, analyzing and discussing therelativity of chemical and physical properties and heavy metal accumulation, whichmonitoring the distributing of characteristics including soil ph, content of organicsubstance, size distribution and content of heavy metal by adopting Potentiometry,Potassium dichromate method, Laser particle size analysis and Inductively coupledplasma emission spectrometry to29sediment samples respectively. Then, evaluatingheavy metals pollution of sediment of Duchuan section in Gubin rivercomprehensively put to use Fuzzy comprehensive evaluation of Fuzzy mathematics.Results from the study can be seen:(1)The sequence of average of heavy metals each section of Duchuan sectionfrom Gubin river is Gubinheganliu>Hedun river>Caifan rive; The order of exceed thestandard is As>Pb>Zn>Ni>Cr>Cu>Cd; In addition to Cd, the other heavy metals ofoverstepping of Gubinheganliu are top the list in Duchuan section from Gubin river.(2)It was showed that fine sand is the major ingredient of Duchuan section inGubin river sediment. Not only the higher PH the more increase heavy metal content, but also the whole environment is slightly alkaline. Besides, the distributing trend oforganic matter of Caifan river and trunk stream of Gubin river is rising up fromupstream to downstream, but it shows the opposite tendency of Hedun river andriverlet of Miaoshi river. Reading these responses: the order of seriation between PHand heavy metal accumulation is Pb>Zn>Cr>Cu>Ni>As>Cd; the sequence of contentof organic substance and heavy metal accumulation is Pb>Cr>Zn>Cu>Ni>As>Cd.(3)It is observed that the best correlation coefficient with content of heavy metalare cumulative content of≤2μm and≤50μm particle diameter; Moreover, Ni is theheavy metal element which is been the strongest adsorption to sediment of Duchuansection in Gubin river, according to adsorption strength of sediment isNi>Zn>As>Cr>Cu>Pb>Cd.(4)The monolithic heavy metals pollution of Duchuan river in Gubin riversediment is between mild contamination and middle level pollution,as well as it’s foursections,but it is more inclined to middle level pollution.