Effects From Applying Passivator On Nutrients And Total Mercury In Soil And Pakchoi Pollued By Mercury

In order to explore the effect of different passivations on soil nutrient,total mercury and nutrient and total mercury in the crop,the experiments in this paper is completed in greenhouse of Shanxi Agricultural University,College of Resources and Environment,studys the law of total nitrogen,total phosphorus,total potassium,and available nitrogen,available phosphorus,available potassium,pH,EC,and CEC in soil and the nitrogen,phosphorus,potassium and total mercury in plant,effected by bentonite,humic acid,and peat,obtains conclusions as follow:(1)In different mercury pollution treatment,respectively add 3 levels of passivations,total nitrogen significant influenced comparing with CK.And the type of passivation adding has significant effect of total nitrogen in soil.In different mercury pollution treatments,total nitrogen in soil under low mercury pollution treatment,as mercury pollution orders from high to low,is 0.57g/kg,0.56g/kg,and 0.53g/kg.In low concentrations of mercury pollution,adding different levels of humic acid,total nitrogen increase in the soil.(2)In the different treatment of mercury pollution in soil,negatively related to total phosphorus and mercury in soil.According to the concentrations of mercury pollution in order from highest to lowest,passivation of different levels in soils,soil total phosphorus concentrations increased.When bentonite is added,according to the order from high to low concentrations of mercury pollution,with a high level of passivation,total phosphorus is respectively 1.15 mg/kg.1.22mg/kg and 1.24mg/kg;with a medium level of passivating agent,its is 1.12mg/kg.1.15mg/kg,1.23mg/kg;with a low level of passivation,it is 1.13mg/kg.18mg/kg and 1.33mg/kg.(3)In the same mercury pollution treatment,the order of available phosphorus with humic acids,according to the order from high to low concentrations of mercury pollution,is high level of humic acid ? medium level of humic acid>low level of humic acid.Adding humic acids from high to low levels,according to the order from high to low concentrations of mercury pollution,available nitrogen is 29.93mg/kg,27.59mg/kg and 25.74mg/kg;34.43mg/kg,30.O1mg/kg and 28.93mg/kg;37.93mg/kg,34.82mg/kg and 30.15mg/kg?(4)In the same mercury pollution treatment,with the equal level of humic acid,the available potassium is higher,which is 231.59mg/kg,compared with bentonite and peat.that is 231.59mg/kg,which is higher compared with CK.The available potassium is more 30.5 1mg/kg,which adds bentonite.The available potassium is 21.32mg/kg higher than the experiment group adding peat,which is 210,27mg/kg.(5)With the same mercury pollution treatment,adding humic acid at the same amount,the phosphorus in crop is decreace In the condition of low mercury treatment,as the order from high to low,the amount of potassium in crops,is 3.98%,4.44%and 4.42%,which reduce 2.84%,2.38%and 2.41%respectively than CK.(6)At different levels of mercury pollutions,the total mercury content increases in soil as bentonite increases.With the highest concentration treatment of mercury pollution,the total mercury content increases from 12.35mg/kg to15.92mg/kg in soil;and the total mercury content decreases from 0.45mg/kg to 0.22mg/kg in crops.In the same mercury pollution treatment,the amount of humic acid added can affect the absorption of mercury and the removal of mercury from soil to crop.When it is the medium level of humic acids,the desorption of mercury reaches the maximum in soil,that is 13.03mg/kg.With the increases of humic acid becoming more,the increase in total mercury content in plants decreases from 0.36 mg/kg to 0.3 mg/kg.For reducing the concentration of total mercury in soil,the order of three kinds of passivators is that,which is "humic acid ? bentonite ? peat".