Pollution Loss Rate Assessment of Soil Heavy Metals in Paddy Field with Sewage Irrigation in Guixi City, Jiangxi Province, China

Abstract:

Taking paddy field sewage irrigated area in Guixi as an examples, pollution lost rate method was applied to pollution assessment of soil heavy metals. The results showed that the average single pollution lost rate of the soil heavy metals was in the order of Cu>Cd>Pb>Zn>As, and the average single pollution lost rates of Cu and Cd are higher than that of other metals, so the integrated pollution lost rate of the metals in any sample site is contributed by them. From the comprehensive pollution lost rate, most sample sites reached the intermediate level ( IV level) , and accounted for 76. 93% of the total sample sites. most of the samples are moderately polluted (IV level), accounting for 50% of the total number of sample sites, The sample sites of No5 and No6 are slightly polluted (III level), accounting for 33%, and only No1 are heavily polluted (Vlevel), accounting for 16.67% of the total sample sites. As a result, the pollution lost rate method manifested more resolving power in the serious pollution index of the soil.

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