Pollution Characteristics and Risk Assessment of Cadmium in Solanaceous Vegetables
The content of cadmium in solanaceous vegetables is high,which often has the risk of exceeding the standard.In order to understand the characteristics of cadmium pollution in solanaceae vegetables,four typical solanaceae vegetables,tomato,eggplant,pepper and Capsicum frutescens,were selected as experimental objects,the samples were separated into three types:seeded,seedless and mixed.microwave digestion was used to pre-treat the samples.The content of cadmium in the samples was determined by a graphite furnace atomic absorption spectroscopy meter,at the same time,the legumes were taken as the control group.The experiment showed that the cadmium content levels in the solanaceae vegetables samples were higher than those in the control group leguminous vegetables,and the solanaceae vegetables content ranged from 0.016 00 mg·kg-1 to 0.094 00 mg·kg-1,while leguminous vegetables content ranged from 0.000 72 mg·kg-1 to 0.005 90 mg·kg-1.Cadmium pollution in solanaceous vegetables is concentrated in the seed sample.Except for tomatoes,the cadmium content in the seed sample is much higher than that in the seedless part.The cadmium content in the Capsicum frutescens seed sample is 0.560 0 mg·kg-1,the chili seed sample is 0.320 0 mg·kg-1,and the eggplant seed sample is 0.120 0 mg·kg-1,all of which are far higher than the national standard limit of 0.05 mg·kg-1.At the same time,the experimental data of cadmium in 20 samples of tomato,eggplant,chili,and Capsicum frutescens were selected to conduct a risk assessment of cadmium pollution index in solanaceae vegetables.The data shows that the comprehensive pollution index of cadmium in tomatoes and chili peppers in solanaceae vegetables is low,belonging to the safe type and with low risk;The comprehensive pollution index of cadmium in eggplant and Capsicum frutescens is between 1.0 and 2.0,which belongs to the mild pollution type and has a certain safety risk.
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