Studies On The Phytoremediation Of HCH-Contamainated Soil

Two parts are given in the thesis:1. Study on the extracted methods of HCH residue in soilThe Capillary gas chromatographic method (GC) was introduced for determining HCH residues in soil. And two extracted methods, such as Soxhelt Extraction and Ultrasonic wave Assistant Extraction(UAE) have been studied. The analytical results showed that the UAE was more efficient and the time was shorter. The method was proved to be simple, rapid and sensitive. The sample recovery was 90.32%- 103.92%, and the relative standard deviation was 2.32 - 9.33.2. The phytoremediation of HCH contaminated soil(1) A phytoremediation technique for contaminated soil by HCH and its main degradation products planting 12 species of grasses was described. The results showed that different species have wide differences capacity in elimination of pollution. Medicago sativa L and Lolium multiforum Lan are best, the third is Echinochloa crusgalli (L.) Beauv. The fouth to sixth are Sorghum Hybrid Sudangrass Vactuca Denticulata Max. and Cichorium lntybus L. the last are Rumex patientia x R.tianschanicus, cv.Rumex k-1 Cajanus cajan (Linn) Hrth Amaranthus hypochondriacus L Pennisetum americanum L.Suhum. Stylosanthes gracilis H.B.K.and Macroptilium atropurpureum.(2) Correlation (R) between biomass S/R and HCH-dissipationed in soil is R=0.928, so high S/R is one of the important indicators to screening plants.(3) Through forecasting the period of repairing soil of twelve grasses, Medicago...