Characteristics, sources, and transport of tetrabromobisphenol A and bisphenol A in soils from a typical e-waste recycling area in South China
Characteristics, sources, and transport of tetrabromobisphenol A and bisphenol A in soils from a typical e-waste recycling area in South China
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DOI：
10.1007/s11356-014-2535-2
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发表时间：
2014-05-01
影响因子：
5.8
通讯作者：
Sun, Cui-Xiang
中科院分区：
文献类型：
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作者：
Huang, De-Yin;Zhao, Hai-Qing;Sun, Cui-Xiang
以龙塘为研究对象，研究了不同土地利用土壤中四溴双酚A （TBBPA）和双酚A （BPA）的形态、来源和迁移规律。我们还研究了TBBPA在水稻土中的还原脱溴作用。未检测到TBBPA和BPA浓度（以干重为基础）分别为220和0.50-325 ng/g，且两者均因相似的因素而增加，其顺序为：池塘沉积物<水稻土=蔬菜土<荒地<拆除场<前露天焚烧场。6种土地利用土壤中BPA浓度均高于TBBPA浓度，且两者呈显著相关。TBBPA和BPA通过土壤剖面进行转运，在0 ~ 40 cm土层中浓度较高，在40 ~ 80 cm土层中浓度较低。表层土壤浓度似乎受到原油回收活动的强烈影响，以前露天焚烧和拆除场地是主要的点源。露天焚烧场和拆解场的周围地区不仅受到倾倒废渣的污染，而且受到飞灰沉降的污染，尽管农业土壤远离点污染源。土壤中的部分BPA可能是TBBPA的还原性脱溴产物，因为较长的雨季促进了TBBPA的转化，并且BPA可以持续较长时间。培养实验证实，TBBPA可转化为BPA，并可在淹水水稻土中积累，这可能是龙塘地区BPA浓度高于TBBPA浓度的原因。
We studied the tetrabromobisphenol A (TBBPA) and bisphenol A (BPA) patterns and their sources and transport in different land-use soils from Longtang, South China, a typical electronic waste recycling center. We also studied the reductive debromination of TBBPA in paddy soils. TBBPA and BPA concentrations (on a dry weight basis) were undetected-220 and 0.50-325 ng/g, respectively, and both increased, by similar factors, in the following order: pond sediments < paddy soils = vegetable soils < wasteland < dismantling sites < former open burning sites. BPA concentrations were higher than TBBPA concentrations in all six land-use soils, and they correlated significantly. TBBPA and BPA were transported through the soil profiles, being found at relatively high concentrations in soil 0-40 cm deep, but only at low concentrations in soil 40-80 cm deep. The surface soil concentrations appear to have been strongly affected by crude recycling activities, and former open burning and dismantling sites were the main point sources. The areas surrounding the open burning sites and dismantling sites have been contaminated not only by the dumping of waste residues but also by fly ash deposition, even though the agricultural soils are far from the point pollution sources. Some BPA in the soils is likely to be the reductive debromination product of TBBPA because the long rainy season promotes TBBPA transformation and because BPA can persist for a long time. Incubation experiments confirmed that TBBPA could be transformed into BPA and that BPA could accumulate in waterlogged paddy soils, and this may be why BPA concentrations were higher than TBBPA concentrations in the Longtang area.