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首页> 外文会议>Biogeochemistry of Trace Elements: Environmental Protection, Remediation and Human Health international Symposium >Effects of sewage sludge application on heavy metals status in soil and wheat
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Effects of sewage sludge application on heavy metals status in soil and wheat

机译：污泥施用对土壤和小麦中重金属状况的影响

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Application of sewage sludges on farmland as fertilizers is a common practice in Iran as in many other countries. As a result, large amounts of heavy metals are introduced in this way onto large areas of arable land. Little is known about the uptake of these metals by crop plants and the risks that result to human health via the food chain under the conditions of Iranian agriculture. The objective of this 4-year study was to determine residual and cumulative effects of repetitive sewage sludge applications on the ac-cumulation of lead (Pb), cadmium (Cd), zinc (Zn), and copper (Cu) in soil and wheat (Triticurn aestivum). Sewage sludge was applied in four subsequent years at rates of 25, 50 and 100 Mg·ha on plots of an experimental farm nearby Isfahan. To study not only cumulative, but also residual effects, applications were discontinued in subsequent years on part of the area to which sludge had been applied in the preceding year. Total sludge amounts applied were 25, 50, and 100 Mg·ha in plots with one application, 50, 100, and 200 Mg·ha in plots with two applications, 75, 150, and 300 Mg · ha in plots with three applications and 100, 200, and 400 Mg· ha in plots with four applications. Wheat (Triticum aestivum) was grown each year. After the fourth year, soil samples from 0-20 cm depth were analyzed for total and DTPA-extractable concentrations of Pb, Cd, Zn and Cu. Roots, stalks and grains were separately analyzed. Sludge applications at a rate of 100 Mg· ha (for all the metals) and at a rate of 50 Mg·ha (for Cu) increased DTPA-extractable metal concentrations significantly. DTPA-extractable concentrations of Pb, Zn and Cu were closely correlated with total concentrations. Lead, Cd, Zn and Cu uptakes in stalks and Pb, Zn and Cu concentrations in grains were significantly higher in some of the sludge treatments than on the untreated control plots.
机译：像许多其他国家一样，在伊朗将污水污泥用作肥料是一种普遍做法。结果，大量的重金属以这种方式被引入到大面积的耕地上。对于农作物摄取这些金属以及在伊朗农业条件下通过食物链对人类健康造成的风险知之甚少。这项为期4年的研究的目的是确定重复性污泥应用对土壤和小麦中铅（Pb），镉（Cd），锌（Zn）和铜（Cu）累积的残留和累积影响（普通小麦）。随后四年中，在伊斯法罕附近的一个试验农场的地块上分别以25、50和100 Mg·ha的速率施用了污泥。为了不仅研究累积影响，而且还研究残留影响，在随后的几年中，对前一年施用污泥的部分地区停止了应用。在一次施用的样地中施用的污泥总量为25、50和100 Mg·ha，在两次施用的样地中施用的污泥总量为50、100和200 Mg·ha，在三种施用的样地中施用的污泥量分别为75、150和300 Mg·ha。在四个应用程序的小区中分别达到100、200和400 Mg·ha。小麦（Triticum aestivum）每年都种植。第四年后，对0-20厘米深度的土壤样品进行了总含量和DTPA可萃取的Pb，Cd，Zn和Cu浓度分析。分别分析了根，茎和谷物。污泥施用量为100 Mg·ha（对于所有金属）和50 Mg·ha（对于Cu）显着提高了DTPA可萃取金属的浓度。 DTPA提取的Pb，Zn和Cu的浓度与总浓度密切相关。在某些污泥处理中，秸秆中铅，镉，锌和铜的摄入量以及谷物中铅，锌和铜的浓度显着高于未处理的对照地块。

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