农田土壤中酞酸酯污染对辣椒品质的影响

Influence of Phthalic Acid Esters in Vegetable Garden Soil on Quality of Capsicum Fruit

采用田间试验方法研究了农田土壤中的DBP/DEHP对辣椒的污染和对其品质的影响。试验小区表土(0—10cm)用不同浓度的DBP/DEHP混合液(1∶1W/W)处理后移植辣椒幼苗,90d后采集辣椒果实、植株和根系样品。结果表明,在辣椒果实、植株及根系中DBP残留量都随土壤中施加的DBP/DEHP浓度增加而增加,但没有检测到DEHP的残留。当土壤中DBP/DEHP施加浓度为5、10、20、40、80、160mg·kg-1土时,辣椒果实中维生素C和辣椒素含量与对照相比分别下降了1.6%、5.9%、10.6%、18.2%、19.2%、22.6%和1.6%、2.5%、12.9%、20.1%、22.2%、23.2%。相关分析表明,果实中维生素C和辣椒素含量的下降与DBP残留量的增加显著负相关,说明植物对DBP的吸收可能是导致辣椒品质下降的主要原因。

A field experiment was conducted to investigate the contamination by DBP and pollution of DEHP on Capsicum annuum grown in DBP and DEHP- contaminated soil and to research effects of DBP and DEHP on quality of capsicum fruit. The top layer soil (0—10 cm) of plots was treated with a mixture of DBP and DEHP (1:1, W/W) and capsicum seedlings were transplanted. After 90 days, capsicum fruit, shoot and root samples were collected. The results showed that DBP concentration in fruit, shoot and root increased with the increase of soil receiving DBP/DEHP, but DEHP was not detected in all samples. When the soil receiving DBP/DEHP at 5,10,20,40,80 and 160 mg·kg-1, vitamin C and capsaicin contents in capsicum fruit decreased by 1.6%, 5.9%, 10.6%, 18.2%, 19.2%, 22.6% and 1.6%, 2.5%, 12.9%, 20.1%, 22.2%,23.2%, respectively, compared with that from control plots. Pearson correlation analysis demonstrated that a negatively correlation was found between vitamin C, capsaicin contents and DBP concentrations in capsicum fruit, suggesting that uptake of by the plant be mainly responsible for quality degradation of capsicum fruit.