台灣地區含有高砷地下水之地區以嘉義縣的布袋鎮、義竹鎮，以及台南縣的北門鄉、學甲鎮最為嚴重。雖然上述四地區的居民在自來水普及之後，幾乎已經不再飲用井水，但當地居民取用含砷地下水進行稻田灌溉及養殖魚蝦的情形依然不變。由於稻米是國人的主要糧食，對其食用安全性是不可忽視的，因此本研究嘗試了解使用含砷地下水來灌溉對於稻米是否會產生影響進而造成對人體危害。本研究採用地質統計中的克利金方法來估計研究區中地質的含砷量，以求得最佳的空間估計值。再經由地質統計之結果結合風險評估藉以推估出嘉南地區地下水中的砷對於作物(稻米)之影響性進而了解地下水含砷是否會危害到人體。
本研究分析之結果顯示：在本研究區域之含砷地下水的空間結構連續性是以東北-西南向為主，且本研究地區之地下水含砷量幾乎都超過了飲用水最大可容許量(>0.01 mg/l)，其最高含砷量之地區是位於嘉義布袋、朴子及台南北門、新市等處。而含砷地下水之時空分佈情形，比較值得注意是在民國94年裡其空間連續性由東北-西南向轉至東-西向，且影響範圍似乎有縮小之趨勢。並針對三股站砷濃度之異常升高，研判可能與總有機碳、錳之改變量有相關，顯示該地區可能於民國94年有外來刺激源以改變當地之水文地質環境。
風險評估針方面，對以含砷地下水為農田灌溉水源之稻米。風險評估分析之結果顯示，地下水含砷量若是超過0.035 mg/l，則稻米含無機砷量已達食品危險標準值(0.15 mg/kg)，而在研究區內僅上、下部地區及中部靠山之地區為安全區外，其餘地區都已超過危險標準。因此農田灌溉用水能仍應做避免使用含砷之地下水源，以減少砷可能造成之毒害。
在不同因子影響之分析上，稻米吸附砷較土壤吸附砷對稻米含砷安全之影響性來的大。

Arsenic in ground water has been detected in many areas of Taiwan. The most serious areas include Jiayi County and Tainan County. Although residents of these areas have no longer to drink ground water after tap-water supplies these areas, ground water is still used for crop, cultivation fish and shrimp. Since rice has been the main food source of Taiwan resident, the edible security can’t be ignored.This research investigates the risk analysis of arsenic in groundwater on crop in Chia-Nan area. Geostatistical method was conducted to describe the spatial distribution of arsenic. The result is combined to risk assessment to estimate the effect of arsenic in the Chia-Nan region groundwater on the crop. Our results show that the spatial structure of the groundwater containing Arsenic has the longest correlation in northeast-southwest direction. Most of Chia-Nan areas contain the Arsenic in the water exceeding 0.01 mg/L, which is the maximum drinking water toleration. Besides, the areas for highest concentration are Budai, Beimen, Puzih and Shin-shih. The most correlated direction of the arsenic in groundwater changes from northeast-southwest to east-west direction in 2005. The influence range seems to reduce gradually. The Arsenic concentration of the station Sangu is found to be abnormally high, which may be in conjunction with the change of TOC and Mn. This result indicates that the hydrogeological environment may be impacted by some unknown external stimuli in 2005. Risk assessment is performed to evaluate the impact of arsenic in groundwater to crop. The results shows that as concentration of ground water contains exceeds 0.035 mg/l, the inorganic arsenic quantity in rice has reached the food standard (0.15 mg/kg). Inland of the Chia-Nan area is safe for rice containing Arsenic. However, other areas may exceed the standard. Therefore, groundwater should be carefully used for irrigation. From the sensitivity analysis, the arsenic adsorbed by rice seems to have more influence than the arsenic adsorbed by soil.

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