|
| Preliminary study on passivation effects of mercury in riceby different amendments in mercury-mining areas |
| |
| DOI： |
|
| Hits: 1303 |
| Download times: 715 |
| Abstract: |
| Situ pot method was used to study the passivation effects of different amendments on total mercuryin rice in mercury-mining areas. The results showed that the total mercury in soil and rice exceeded aboutmore than 50 times（the limited value in GB 15618-2008）and 10 times（the limited value in GB 2762-2005），respectively. Amendments could generally inhibit the accumulation of total mercury in rice from soil in Meizixi（MZX）and Aozhai（AZ），and the reducing rates reached 10.86%-40.95% and 13.54%-35.8% with a reductionof 23.0 ng/g-90.5 ng/g and 34.54 ng/g-68.78 ng/g. The farmyard manure treatment had the highest averagereductive rate and amounts with 30.55% and 70.94 ng/g in the two places，and followed by fly ash with 30.18%and 70.59 ng/g. The passivation effect of Epiolite was the lowest among all amendments，the reduction rate andamount were 11.98% and 28.77 ng/g. The variance of agronomic measures including irrigation and fertilizationhad important impact on the accumulation ability of rice to mercury. Compared with the single application，the combination of Attapulgite clay and Calciumm a g n esi u m p h o s p h a t e（f e r t i l i z e r）r es p e c t i v e l yimprove the reduction amounts about 12.31 ng/g and19.67 ng/g. Therefore，the combination of dif ferentamendments owned a certain prospect. The variousc l a y m in e r a ls p r o d u ce d d i f f e r e n t e f f e c t s w i t hMedical stone powder>Attapulgite clay>Activatedclay>Sepiolite. |
|
View Full Text
View/Add Comment Download reader |
