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Effects of Groundwater Irrigation and Petroleum Exploiting on Soil Arsenic Levels
- Su, Yuhong, Chen, Tingting, Yuan, Xuehua
- Soil & sediment contamination 2018 v.27 no.7 pp. 551-562
- agricultural soils, arsenic, groundwater, human health, irrigated soils, microirrigation, petroleum, roots, China
- In order to evaluate the combined effects of drip irrigation and petroleum extraction activities on As contamination and distribution in local soils, a total of 141 soil and 30 groundwater (GW) samples from field sites drip-irrigated with GW in Kuitun, Xinjiang, China were collected and analyzed arsenic (As) levels. Soil As levels ranged from 6.74 to 23.10 mg·kg⁻¹. For the field irrigated with As-loaded GW for 0.5-10 years, As levels in soils increased by 0.50-9.10 mg·kg⁻¹ as compared with the control soils. As levels in all top-layer (0-10 cm in thickness) irrigated soils A (0-5 cm away from dripper) were found to be higher than those in top-layer irrigated soils B (5-10 cm away from dripper). It was estimated that As in agricultural soils increased by approximately 11∼3789 g·yr⁻¹·ha⁻¹ under drip irrigating, most of which in top-layer soils covering the plant roots. The widely used drip irrigation system in Kuitun enhanced the ecological and human-health threats of As via affecting its spread into soils. Furthermore, the petroleum exploiting activity further promoted As levels in local soils. Within a distance of 10∼1000 m away from petroleum exploiting sites, the soil As level decreases significantly with the distance.