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- W2360888964 abstract "Irrigation of sewage water has been applied for agriculture production in Tianjin for over 50 years,since Tianjin is a city lacking water resource seriously.Heavy metals in soils could not be degraded,but accumulated,causing hazards to human beings though food-chain.Twenty-two sites of samples(including pairing soil and lettuce) were collected from seriously polluted areas along the three sewage rivers in Tianjin,and the contents of cadmium(Cd) and mercury(Hg) were measured.Moreover,different extraction methods were studied to check their applicability for predicting bioavailability of the two metals.Nine of the 22 soils exceeded the National Soil Quality Standard Ⅱ for Cd(0.6 mg·kg-1) and 7 exceeded the standard for Hg(1.0 mg·kg-1).Over 60% percent of Cd concentration in lettuce exceeded the National Food Quality and Safety Standard for Cd(0.2 mg·kg-1),while the Hg concentrations of all the samples exceeded the standard for Hg(0.01 mg·kg-1).Hence,the heavy metal pollution has threatened the safty of vegetable.The metal contents in lettuce did not correlate with those in soils,wich were influenced by soil physico-chemical properties.Of five extraction solvents tested(HCl,CaCl2,NH4AC,diethylene-triaminepentaacetic acid(DTPA) and M3),M3 and DTPA showed good capacity for predicting the bioavailability of Cd,with the correlative coefficients(R) being 0.92 and 0.88 respectively.M3 showed better correlation,moreover,it cost shorter time for extraction.Hence,M3 was a promising method for Cd bioavailability prediction.However,both M3 and DTPA failed for the prediction of Hg bioavailability,showing a negative correlation for Hg(R=-0.82 and-0.47,respectively).This might be because Hg has caused adverse effects on lettuce,hindering the transfer of Hg from root to the edible part of lettuce." @default.
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- W2360888964 date "2012-01-01" @default.
- W2360888964 modified "2023-09-24" @default.
- W2360888964 title "Comtamination of Cadmium and Mercury in Farmland of Tianjin and Extration Methods for Predicting Their Bioavailability" @default.
- W2360888964 hasPublicationYear "2012" @default.
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