長項製鍊所의 排煙에 影響을 받는 地域의 土壤과 水稻를 對象으로 Cd, Cu, Pb 및 Zn등 重金屬含量을 調査分析한 結果를 要約하면 다음과 같다. 1. 製鍊所의 排氣에 依한 汚染은 東쪽 方向에서 가장 甚하였고 Pb의 天然賦存量을 基準으로 하였을 때 汚染距離는 5㎞이었으며 表土에 많이 蓄積되고 있었다. 2. 土壤中 重金屬全含量에 對한 0.1N-HCl 및 N-NH₄Ac에 의한 溶出率은 表土에서 高度의 有意性있는 相關을 나타냈다. 3. 土壤中 有機物含量 및 陽ion置換容量과 重金屬全含量間에는 有意性있는 相關을 나타냈다. 4. 製鍊所周邊 土壞에서 生産된 玄米中의 重金屬含量은 Cd가 0.23∼1.33, Cu은 2.39∼6.25, Pb은 0.95∼8.32, Zn은 14.60∼27.31ppm이었다. 5. 地上部 植物體中의 Cd, Cu 및 Zn의 含量은 玄米中 이들의 含量과 有意性 있는 正의 相關을 나타내었다. 6. 玄米中 Cd, Cu, Pb 및 Zn의 含量은 汚染源으로부터 멀리 떨어질수록 減少하였다.

Soils and rice plants subject to smoke from the Jang-hang Smelter were samples at two depths to assess the nature and extend of Cd, Cu, Pb, and Zn contamination, particularly with respect to distance from pollution source. Soils at east site within 1㎞ of the center of the smelter were highly contaminated with Cd, Cu, Pb, and Zn. Metal levels in the smoke-polluted area were higher in surface soil than in subsurface soil, and decreased rapidly with distance reaching nearly background levels at 5㎞ from pollution source. A position correlation was found between contents of total and 0.1 N HCl-extractable, or 1.0N CH₃COONH₄- extractable heavy metals in surface soils of pollution. Contents of heavy metals in soils were positively correlated with soil organic matter and cation exchange capacity. The contents of heavy metals in brown rice collected from the paddy field around the Jang-hang Smelter were in the range of 0.23-1.33 ppm for Cd, 2.39-6.25 for Cu, 0.95-8.32 ppm for Pb and 14.60-27.31 for Zn. The contents of Cd, Cu, and Zn in rice straw were positively correlated with those in the brown rice. Negative correlation was found between the contents of Cd, Cu, Pb, and Zn in brown rice and the distance from the source.