14 kinds of PCBs were determined in water and soil of a paddy field in Dragon Bridge, Nanjing, P. R. China, which is a typical small watershed irrigated area. The results showed that: 14 congeners of PCBs were detected at different residue levels, the dominant components of PCBs were tri-, tetra-, and penta-chlorinated PCB congeners, accounting for 82.37% ~ 95.45% of total PCBs. The concentration range of PCBs in the water of paddy field was 34.0 ~ 148.6 ng/L, their mean content in surface water was 144.01ng/L and that in groundwater was 53.77 ng/L, the trend of vertical migration in the paddy field is very obvious. The concentration range of PCBs in paddy soil was 288.6 ~ 473.7 ng/g, and their mean value was 357.5ng/g. The ΣTEQ range was 0.75 ~ 1.89 pg/g, the ecological risk of research area was a bit high than other region in China. The residual content of PCBs in the paddy field is mainly affected by the using of fertilization and pesticides.
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机译：在中国典型的小流域灌溉区南京龙桥的水田和土壤中测定了14种多氯联苯。结果表明：在不同残留水平下检测到14种多氯联苯同源物，多氯联苯的主要成分为三氯，四氯和五氯联苯同源物，占多氯联苯总量的82.37％〜95.45％。稻田水中多氯联苯的浓度范围为34.0〜148.6 ng / L，地表水中的平均含量为144.01ng / L，地下水中的平均含量为53.77 ng / L，稻田中的垂直迁移趋势为非常明显水稻土中多氯联苯的浓度范围为288.6〜473.7 ng / g，平均值为357.5ng / g。 ΣTEQ范围为0.75〜1.89 pg / g，研究区域的生态风险比中国其他地区高。稻田中多氯联苯的残留含量主要受施肥和农药使用的影响。
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