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本研究对化工、冶金、轻工、生活区、再生骨料等五种不同来源建筑废物中砷含量、单因子评价、元素相关性、化学形态及风险评估进行了分析。对砷含量分析表明不同来源建筑废物中砷平均含量差别不大分别为再生骨料 u003e 居民区 u003e 冶金 u003e 化工 u003e 土壤环境质量三级标准阈值 u003e 轻工。单因子评价也表明生活区和再生骨料砷污染比其他严重为中度污染而化工、冶金、轻工为轻度污染。同时砷含量分布极度不均如冶锌厂清洗车间样品和南京某钢铁厂锅炉车间烟囱外壁刮落物其含量远高于土壤环境质量三级标准阈值化工和冶金砷污染都与其具体工艺段是否接触含砷原料有关。元素相关性分析显示砷与铁、锰均呈较强正相关性表明建筑废物中砷与铁锰密切相关。风险评估主要针对酸可提取态分析结果显示CI7-CI10均为无风险MI1为低风险MI2为中等风险。通过化学形态分析得出来源于电镀厂镀锌车间、镀铬车间、镀镍车间砷均以残渣态为主且这三个车间砷含量均低于土壤三级标准阈值。但电镀厂镀铜车间和冶锌厂建筑废物中砷有较高的迁移能力反映其与矿物结合松散具有较大的环境风险。 This study was initiated to characterize and assess the arsenic (As) concentration, single factor evaluation, correlation among elements, chemical speciation and environmental risks in construc-tion u0026 demolition (CD their combination with the minerals is loose, and poses a very high risk of environment.

Characteristics of Arsenic Pollution and Chemical Speciation Distribution in Construction & Demolition Waste from Five Sources