Assessment of Nutrient Content and Heavy Metal Pollution in Gangue Waste Lands with Different Dumping Years Assessment of heavy metal content and pollution in organic and conventional farming soils in North China Distribution features and environmental risk assessment of heavy metals in apple tree plantations in Luochuan tableland Source identification and potential ecological hazards assessment of trace metalloid/heavy metals in the soil of Tianshan Mountains, Xinjiang, China. Heavy metal concentrations and pollution assessment of riparian soils in Shandong Province Assessment of organic pollution for surface soil in Shenyang suburbs Soil heavy metals concentration in different type plantations in Harbin City.