The Effect on Cadmium Uptake and Accumulation of Vegetable under Cadmium Pollution

The hydroponic and pot culture experiment was carried out to study the effect on cadmium uptake and accumulation of vegetable under exogenous cadmium addition.The results showed that the cadmium content of vegetables increased with the increasing of exogenous cadmium.There are a marked relativity between cadmium content in vegetable and cadmium concentration in ambient medium.Among the three vegetables,the cadmium content of pakchoi is the highest,then is celery,the pepper is the lowest,which is less than 25% of the pakchoi.Based on the threshold of human dietary toxicity for Cd,the critical levels of Cd for pakchoi,celery,and pepper were 0.06,0.086,and 0.11 mg/L under hydroponic conditions,and the corresponding value for total cadmium in soil were 0.68,0.57,0.60 mg/kg respectively.