摘要
在水稻土中施用城市污泥和化肥盆栽蕹菜，应用GC／MS技术对蕹菜植株、土壤和渗漏水中2，4-二硝基甲苯（2，4-DNT）和2，6-二硝基甲苯（2，6-DNT）进行分析。结果表明，各处理蕹菜植株中2，4-DNT和2，6-DNT在各处理植株中的含量分别为0．035～0．307mg／kg和0．007～0．392mg／kg；土壤中的含量分别为0．015～0．146mg／kg和未检出～0．285mg／kg；渗漏水中的含量分别低于0．10mg／L和未检出。施肥（包括化肥、污泥、污泥＋化肥）可能导致蕹菜植株和土壤中2，6-DNT的累积，2，4-DNT的情况较复杂。施肥也可能导致水体2，4-二硝基甲苯污染。不同处理的土壤-植株-渗漏水系统中2，4DNT和2，6-DNT的含量分布特征不同。化肥中2，4-DNT的生物有效性明显高于2，6-DNT，施用化肥提高了污泥中2，4-DNT的生物有效性，降低了2，6-DNT的生物有效性，使2，4-DNT更易被蕹菜吸收积累，2，6-DNT更趋于分布在土壤中。
Ipomoea aquatic was potted in paddy soil applied with municipal sludge and chemical fertilizer, and 2,4-dinitrotoluene and 2,6-dinitrotoluene in plant, soil and leaehate were determined by GC/MS to investgate distribution features of dinitrotoluene in Ipornoea aquatic-soil-leaehate system. Results show that the concentrations of 2,4-dinitrotoluene and 2,6-dinitrotoluene range from 0. 035 mg/kg to 0. 307 mg/kg and from 0. 007 mg/kg to 0. 392 mg/kg in Ipornoea aquatic, respectively, and from 0. 015 mg/kg to 0. 146 mg/kg and from below detection limit to 0. 285 mg/kg in soil respectively. The concentrations of 2,4-dinitrotoluene and 2,6-dinitrotoluene in leaehate were less than 0. 10 mg/L and below detection limit respectively. Both municipal sludge and chemical fertilizer resulted in accumulation of 2,6-dinitrotoluene in Ipomoea aquatic and soil, and the accumulation of 2,4-dinitrotoluene in leachate as well as 2,4-dinitrotoluene in chemical fertilizer were much more bioavailable than 2,6-dinitrotoluene. Biolavailabilities of 2,4-dinitrotoluene and 2,6-dinitrotoluene in municipal sludge were both affected by applying chemical fertilizer to promote the former while inhibit the latter, which increased the uptake of 2,4-dinitrotoluene by plant and accumulation of 2,6-dinitrotoluene in soil.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第9期180-183,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(39870435
30471007)
教育部科技研究重点项目(地方02112)
广东省自然科学基金(021011
036716)
广东省科技计划项目(01C21202
03A20504
03C34505)
广东省环保科技开发研究项目(粤环2001-20)
广东省教育厅自然科学研究项目(Z02004)
关键词
城市污泥
二硝基甲苯
蕹菜
水稻土
渗漏水
municipal sludges
dinitrotoluene
Ipornoea aquatic
paddy soil
leaehate
