| Study on migration mechanism of chromium in loess soil under irrigation condition |
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| DOI：10.7606/j.issn.1000-7601.2013.01.23 |
| Key Words: chromium loess migration characteristics |
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| Abstract: |
| Aimed at the environmental quality issues of soil
and groundwater caused by chromium pollution, the vertical migration and absorpt
ion characteristics of chromium in loess were studied through indoor soil column
-eaching test with the irrigation quantity and concentration of chromium as co
n
trolling factors. The experiments were performed with 25 treatments including 5
levels of irrigation quota and 5 levels of chromium concentration, using the ful
l combination design. The result showed that the soil chromium content in the sa
me loess layer was positively correlated with irrigation quantity and soil water
content under the condition of the same chromium concentration. When chromium c
oncentration was 25.0 mg·L-1 and irrigation quantity was 318.5 mm, the co
ntent of c
hromium reached the highest point (98.7 mg·kg-1) at 10 cm soil depth.
Under the con
dition of the same irrigation quantity, the chromium content and absorption rate
in soil increased with the increase of chromium concentration. It could be conc
luded that the migration of chromium in loess was closely related with the depth
of soil, irrigation quantity, soil water content and chromium concentration. |
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