近年台灣環境污染議題日益嚴重，其中重金屬為重要之污染類型，環境中之重金屬污染可經由土壤、空氣及水源等途徑進入農作物內，同時重金屬具有不易裂解之特性，因此容易累積於農作物中而提高其重金屬含量。雖有許多文獻指出攝入受污染之農作物後，造成民眾體內重金屬之累積及健康上之不良影響，然對於農作物吸收來自環境中重金屬時，重金屬累積對農作物本身抗氧化物等成分影響之相關國內外研究卻鮮少深入探討之。

本研究之目的為以台灣受重金屬污染土壤與無污染土壤，種植不同種類之蔬菜，探討不同蔬菜經由土壤傳輸而吸收重金屬之累積狀況，並評估種植過程中因重金屬之累積導致蔬菜中抗氧化物含量之變化，最後以蔬菜中重金屬含量分析結果，進行民眾攝取蔬菜之健康風險評估，以此結果提供民眾飲食建議與受重金屬污染土地之管理規劃策略。

本研究挑選已受重金屬污染之土壤(實驗組1)與無污染之土壤(即培養土，對照組)，實驗組2以人工添加重金屬於對照組土壤進行盆栽試驗。挑選五種蔬菜進行盆栽試驗，每一種蔬菜以實驗組1、實驗組2各兩個樣本與對照組一個樣本為一個單位，進行三重複栽種，最後完成75盆蔬菜樣品之栽種，並以此結果評估所栽種之蔬菜對人體之健康風險評估與其污染對於蔬菜抗氧化活性之影響。

土壤之重金屬分析結果顯示，於實驗組1與實驗組2中種植完後，土壤中鎘與銅之濃度均有下降趨勢，其下降程度以空心菜與甘藷葉組較高。蔬菜之生長狀況結果顯示，於實驗組1-Cd、實驗組2-Cd與對照組中，馬鈴薯與甘藷之植株生長高度與採收量，於實驗組具顯著性下降。且於實驗組1-Cu、實驗組2-Cu與對照組中，甘藷之植株生長高度與採收量，於實驗組亦具顯著性下降。

蔬菜之重金屬分析結果顯示，於實驗組1-Cd與實驗組2-Cd中鎘濃度最高者為空心菜(2.38±0.18 mg/kg、0.92±0.40 mg/kg)。另於實驗組1-Cu與實驗組2-Cu中銅濃度最高者為馬鈴薯與空心菜(3.21±0.17 mg/kg、5.10±0.62 mg/kg)。蔬菜之重金屬BAF結果顯示，於實驗組1-Cd中鎘BAF最高者為空心菜(0.29±0.02)。於實驗組1-Cu中銅BAF最高者為馬鈴薯(0.008±0.00)。因此由本研究中發現於鎘污染組，均以空心菜之鎘累積能力最強，另於銅污染組則為馬鈴薯與空心菜，相對的，甘藷葉於兩種金屬污染均屬累積能力較弱者。

蔬菜之抗氧化物分析結果顯示，於實驗組1-Cd與實驗組2-Cd中維生素C最高者為甘藷葉(25.3±4.01 g/kg、13.6±0.82 g/kg)，於不同組別採收之空心菜與甘藷葉中維生素C濃度達顯著性差異。於實驗組1-Cu與實驗組2-Cu中維生素C最高者亦為甘藷葉(28.4±4.38 g/kg、20.8±0.76 g/kg)，於不同組別採收之甘藷葉中維生素C濃度達顯著性差異。另於實驗組1-Cd與實驗組2-Cd中維生素E最高者分別為番茄與甘藷(17.1±0.57 mg/kg、27.3±0.40 mg/kg)，不同組別採收之甘藷葉與番茄中維生素E濃度達顯著性差異。於實驗組1-Cu與實驗組2-Cu中維生素E最高者亦為番茄與甘藷(18.6±0.29 mg/kg、22.3±3.51 mg/kg)，不同組別採收之甘藷中維生素E濃度達顯著性差異。

經攝取受污染蔬菜之健康風險結果顯示，不同年齡族群之P50-P95之鎘HI最高者為0-3歲(4.80-11.6)，且於不同年齡層之HI結果均大於1，表示攝取這些受鎘污染之蔬菜確實對民眾具顯著性之非致癌性健康影響。另不同年齡族群之P50-P95之銅HI最高者亦為0-3歲(0.26-0.56)，且於不同年齡層之HI結果均小於1，表示攝取這些受銅污染之蔬菜對民眾非具顯著性之非致癌性健康影響。然台灣至今仍有許多土地遭受重金屬之嚴重污染，因此對於台灣民眾經攝取蔬菜而暴露於重金屬之健康影響，仍為須關注之重要議題。

The aims of this study were to evaluate the accumulation of the heavy metals in vegetables and its influence for the antioxidants by pot experiments. In addition, we also estimated the health risk of the residents via consuming these contaminated vegetables. Totally, 75 pots were cultured for five kinds of vegetables with the same soil and analyzed the metal level in soil, water and vegetables. In addition, the antioxidants level for each vegetable were also analyzed. These results were utilized to evaluate the risk of consuming vegetables.

The result showed that the concentration of Cd and Cu in water spinach and potato were the highest among other vegetables. Meanwhile, the antioxidant monitoring in all the vegetables demonstrated that vitamin C level within sweet potato leaf and the vitamin E level in tomato and sweet potato were the highest among other vegetables. Finally, the results of health risk for the residents showed that the HI were above than 1 in all age groups via consuming the Cd-contaminated vegetables and the HI were lower than 1 in all age groups via consuming the Cu-contaminated vegetables. Therefore, there is an important issue in the exposure of heavy metals through the ingestion of vegetables.

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