Evaluation Of Sanitation Of Some Available Wild Vegetables In Nanning City

In this thesis, the present situation of nitrate and heavy metal(Cu,Zn,Cd,Pb)pollution of 10 available wild vegetables in Nanning city was investigated andevaluated. The results were showed as follows:1. None of these 10 available wild vegetables in Nanning city was polluted bynitrate, All the pollution index of them below 0.3, It indicates that nitratecontents of these 10 available wild vegetables in Nanning city suburbscorrespond with edible sanitation standard.2.None of undomesticated wild vegetables in Nanning city exceeds thestandard of Cu,Zn,Pb and Cd. While some of domesticated wild vegetableswere polluted by Pb and Cd.Pb pollution was the most serious, following by Cd,but the wild vegetable were not polluted by Cu,Zn. Pb exceeding took place ineach wild vegetable, and the rate of exceeding standard of Pb in CormmonPerilla and China Wolfberry both reached to 66.67%,which was highest amongthose wild vegetables. The rate of exceeding standard of Cd in China Wolfberryreached to 66.67%, which was highest among those wild vegetables. According tothe synthetic pollution index of wild vegetables, the highest was China Wolfberry,reach to 0.93.3.The average contents of Cu,Zn,Cd,Pb in Nanning city suburbs' wildvegetable garden soil were higher than the background values of Nanning citysoil. The domesticated wild vegetable garden soil have not been polluted by Cu,Zn,Pb except Cd. Cd pollution was rather critical, and rate of exceedingstandard of Cd was 15.45%. The synthetic pollution index of Cd in soil was thehighest, reach to 1.27(Light degree pollution).The synthetic pollution index orderof heavy metals among investigated soil as follows: Cd>Zn>Cu>Pb.4. Cd absorption coefficient of wild vegetables was the highest among theheavy metals was investigated, and the order as follows: Cd>Zn>Cu>Pb. Cd absorption coefficient of India Daisy was the highest among the wildvegetable was investigated.