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首页> 外文期刊>Revista ciencia agronomica >Biodisponibilidade de chumbo por extratores químicos em solo tratado com ácidos húmicos e carv?o ativado
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Biodisponibilidade de chumbo por extratores químicos em solo tratado com ácidos húmicos e carv?o ativado

机译：化学提取器在腐殖酸和活性炭处理后的土壤中铅的生物利用度

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Soil contamination by lead in the town of Santo Amaro, in the state of Bahia, Brazil, originated with the installation of a metal plant in the city in the 1960s, and poses a serious risk to the local population. Determination of the available Pb levels in the soil is an important tool in monitoring the risks of this contamination. However, different methods are used to determine the available Pb content of the soil, resulting in differing values for the extractants. The aim of the present work was to compare the efficiency of extraction using Mehlich 1, DTPA and CaCl2solutions in the evaluation of Pb availability in soil treated with different soil amendments. The soil sample used in the experiment was collected near the metal plant. The dosages of soil amendments were set up based on the carbon content of the materials (compost humic acid, commercial humic acid and charcoal), being: 0, 0.75, 1.5, 3 and 7.5 g C kg-1. The available Pb content was extracted by Mehlich 1, DTPA pH 7.3 and CaCl2 10 mmol L-1. Soil fractionation was carried out to determine the metal attached to the exchangeable and organic matter fractions of the soil. The addition of AHv reduced the Pb content of the soil by 60, 89 and 47% for extractions carried out with Mehlich 1, CaCl2 and DTPA respectively. The Pb content of the organic matter fraction was directly proportional to the dosages of soil amendments. The three extractants under evaluation were efficient in predicting the available Pb content.
机译：巴西巴伊亚州的Santo Amaro镇的铅对土壤的污染源于1960年代在该城市安装的金属工厂，对当地居民构成了严重的风险。确定土壤中可用的Pb含量是监测这种污染风险的重要工具。但是，使用不同的方法来确定土壤中可用的Pb含量，导致萃取剂的值不同。本工作的目的是比较在不同的土壤改良剂处理后的土壤中铅的有效性评估中，使用Mehlich 1，DTPA和CaCl2溶液进行萃取的效率。实验中使用的土壤样品收集在金属工厂附近。根据材料（腐殖酸，商业腐殖酸和木炭）的碳含量设置土壤改良剂的剂量，分别为：0、0.75、1.5、3和7.5 g C kg-1。有效铅含量通过Mehlich 1，DTPA pH 7.3和CaCl2 10 mmol L-1提取。进行土壤分级，以确定附着在土壤中可交换和有机质部分的金属。 AHv的添加使分别用Mehlich 1，CaCl2和DTPA进行萃取的土壤中Pb含量降低了60％，89％和47％。有机物部分的铅含量与土壤改良剂的剂量成正比。被评估的三种萃取剂可有效预测可用的Pb含量。

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