重金属Cd、Zn污染对番茄果实品质的影响及其残留的研究

Studies on the Effects of Heavy Metal Cd and Zn Pollution on Tomato Quality and Residue Content of Heavy Metal

通过温室盆栽试验,研究重金属Cd、Zn对番茄果实品质的影响及其在果实内的残留.结果表明:(1)Cd、Zn处理影响番茄果实品质.随着重金属处理浓度的增加(Cd:0.001 mmol/L^0.1 mmol/L、Zn:0.01 mmol/L^1.0mmol/L),番茄可溶性固形物、维生素C、可溶性糖的变化呈下降趋势,但是差异不显著.而有机酸含量上升,且处理间的差异显著,Zn在1.0 mmol/L时,有机酸含量与对照呈极显著差异.(2)Cd、Zn在番茄果实中的残留量随处理浓度的增加而增加,各Cd处理浓度与对照呈极显著差异.除Zn(0.01 mmol/L)处理外,其余Zn处理间差异显著.与国家蔬菜卫生标准相比,番茄果实中的Cd的含量严重超标,而Zn的含量没有超标.

A pot culture experiment in greenhouse was used to study effects of various Cd and Zn pollution on quality of tomato and residue content of Cd and Zn. The results showed that Cd and Zn could affect tomato quality. With the increase in levels of heavy metal, （ Cd： 0. 001 mmol/L-0. 1 mmol/L, Zn： 0. 01 mmol/L-1. 0 mmol/L ）, the content of solubility solid matter, vitamin C, and soluble sugar decreased in the mass, but they did not changed significantly. On the contrary, organic acid increased and changed significantly. Cd and Za content in tomato fruits rose with the increase in concentration of pollution. There was significant difference between treatment and control under Cd treatment. Under Zn treatment, Zn content enhanced significantly except Zn （0. 01mmol/L） treatment. Comparing to hygienic standard of vegetables, Cd content in tomato exceeded hygienic standard, while Zn content did not exceed hygienic standard.