Kao Jen-Ho, Chen Kang-Shin, Tsai Cheng-Hsien, Li Hsing-Wang, Chang-Chien Guo-Ping
Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China.
J Air Waste Manag Assoc. 2007 Apr;57(4):457-64. doi: 10.3155/1047-3289.57.4.457.
Measurements of the concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were made in ambient air, ash, and soil impacted by the open burning of wax apple and rice straw residues. Measurements showed that the mean PCDD/F concentration (0.458 pg I-TEQ/Nm3; international toxicity equivalence) in air at two wax apple orchards during open burning increased markedly, -8.1 times higher than that (0.057 pg I-TEQ/Nm3); before open burning. In addition, the mean PCDD/F concentration (0.409 pg I-TEQ/Nm3) in ambient air at a rice straw field was 4.6 times higher than that (0.089 pg I-TEQ/Nm3) before open burning. After burning the residues of wax apple stubble and rice straw, the contents of PCDD/F in ashes were 1.393 and 1.568 ng I-TEQ/kg-ash, respectively, and the contents of PCDD/F in soil were 2.258 and 2.890 ng I-TEQ/kg-soil, respectively. Therefore, the turnover of soil with the ash after open burning over years will result in the accumulation of PCDD/Fs in farm soils.
对受莲雾和稻草残茬露天焚烧影响的环境空气、灰烬和土壤中的多氯二苯并对二噁英和二苯并呋喃（PCDD/Fs）浓度进行了测量。测量结果表明，两个莲雾果园露天焚烧期间空气中PCDD/F的平均浓度（0.458 pg I-TEQ/Nm³；国际毒性当量）显著增加，比露天焚烧前（0.057 pg I-TEQ/Nm³）高出8.1倍。此外，一个稻草田环境空气中PCDD/F的平均浓度（0.409 pg I-TEQ/Nm³）比露天焚烧前（0.089 pg I-TEQ/Nm³）高4.6倍。焚烧莲雾残茬和稻草后，灰烬中PCDD/F的含量分别为1.393和1.568 ng I-TEQ/kg-灰，土壤中PCDD/F的含量分别为2.258和2.890 ng I-TEQ/kg-土壤。因此，多年来露天焚烧后用灰烬翻耕土壤将导致PCDD/Fs在农田土壤中积累。
