ABSTRACT

Biosolids are used to improve soil physical and chemical properties. Analysis of biosolids-amended soils from multiple regions of United States using consistent analytical methods is lacking. This Study determined long-term biosolids application on soil pH, electrical conductivity (EC), carbon, cadmium, copper, lead, and zinc concentrations in soils from two regions in United States. At one region, little difference was observed in pH and EC between biosolids-amended surface soils and control, the second region ranged from 5.46 to 7.87 and 50.2 to 402 µS cm⁻¹ respectively. Trace metal levels at this region ranged from 0.76 to 3.79, 8.7 to 54.1, 15.2 to 53.9, and 26 to 207 mg kg⁻¹ for Cadmium, Copper, lead and Zinc respectively; with its carbon levels ranging from 14.5 to 90.0 g kg⁻¹. Metal levels were within the standards for residential occupation with the 40 Code of Federal Regulations (CFR) Part 503 and should not affect soil and groundwater quality.

摘要

生物固体用于改善土壤的物理和化学性质。缺乏使用一致的分析方法对美国多个地区的生物固体土壤进行分析的方法。这项研究确定了美国两个地区的土壤中长期使用的生物固体对土壤的pH值，电导率（EC），碳，镉，铜，铅和锌的浓度。在一个区域中，生物固体改良的表层土壤与对照之间的pH和EC差异很小，第二个区域的范围分别为5.46至7.87和50.2至402 µS cm ^-1。在该区域中的痕量金属的水平从0.76到不等3.79，8.7至54.1，15.2至53.9，和26至207毫克千克^-1为镉，铜，铅和锌分别; 其碳含量范围为14.5至90.0克千克^-1。金属含量符合联邦法规40 （CFR）第503部分的住宅职业标准，并且不应影响土壤和地下水质量。