珠江三角洲典型区水土中铅的分布特征

在研究区采集地表水样品5组、土壤样品32组、地下水样品16组进行分析，探讨珠江三角洲平原区水土中铅的来源及含量. 结果表明，研究区地表水已受到周围含铅工业废水的污染，地表水体的绝大部分铅被吸附在悬浮颗粒上，水溶性ρ(Pb)很低. 表层土壤(0～10 cm) w(Pb全量)为95.6～241.4 mg/kg，受污染的程度与表层土壤受污水灌溉强度密切相关，各形态铅质量分数平均值从大到小依次为残渣态＞氧化物结合态＞弱有机结合态＞碳酸盐结合态＞强有机结合态＞水溶态＞离子交换态. 底层土壤(30～40 cm) w(Pb全量)为77.0～119.8 mg/kg，受污染的程度与土壤的松散或密实程度密切相关，各形态铅质量分数平均值从大到小依次为残渣态＞氧化物结合态＞碳酸盐态＞弱有机结合态＞强有机结合态＞水溶态＞离子交换态. 包气带中w(Pb)随深度增加逐渐减少. 研究区地下水环境已受到铅污染，而地下水环境中的铅主要被吸附在含水介质和胶体等吸附物上，水溶性ρ(Pb)极低. 研究区地下水中ρ(Pb)与地下水中ρ(Fe)，ρ(Al)以及ρ(COD_Cr)呈极显著的正相关关系. 

Distribution of Lead in Water and Soil of Representative Area in Pearl River Delta

Five surface water samples,32 soil samples and 16 groundwater samples were sampled from representative areas of the Pearl River Delta and analyzed in order to determine the origin and content of lead in water and soil of this area.The results show that surface water in this area has suffered lead pollution from surrounding lead industrial wastewater,of which most of the lead has been absorbed in the suspended phase,and only a little of the lead has been dissolved in the liquid phase.Lead content in topsoil(...