電鍍廢水汙染土壤

The Soil Contamination from Electro-plating Shop

劉黔蘭(Chyan-Lan Liu)

《土壤與環境》 1卷2期 (1998/06) Pp. 161-169

https://doi.org/10.30058/SE.199806.0007

摘要

彰化縣東西二圳嘉犁支線灌溉區內電鍍工廠林立，水中鎳、鋅、鉻、銅濃度有多次超過灌溉水標準，有數次甚至超過放流水標準，以鎳為最。底泥中0.1M鹽酸萃取得鎘、鉻、銅、鎳、鉛及鋅濃度分別達10.8、431、1418、2001、49.9、1464 mg/kg。王水消化後測得鎘、鉻、銅、鎳、鉛及鋅濃度分別達14.9、1445、1490、2037、118、1532 mg/kg，亦以鎳濃度最高。局部農田表土（0至15公分）0.1M鹽酸萃取鎘、鉻、銅、鎳、鋅濃度均高出裏土（16至30公分）甚多，且多高於建議管制值或為高量（五級）。王水溶出法結果亦如此，此乃數十年來承受污染之記錄。

關鍵字

水田 ； 重金屬

並列摘要

Experimental plots using the wastewater from electro-plating shop as irrigation water were located at Chia-Li tributary of the East-West stream No.2, in Changhua county, where there were many electro-plating shops. The concentrations of Ni, Zn, Cr, and Cu, especially for Ni in the stream-water were sometimes higher than the values regulated by the Irrigation Water Quality Criteria. Some water analytical data were even higher than those suggested by the Effluent Quality Criteria. Cd, Cr, Cu, Ni, Pb, and Zn concentrations in the sediments from the stream were high as well. The 0.IM HCl extractable amount of Cd, Cr, Cu, Ni, and Zn in the surface soil (0-15 cm) of the irrigation land were much greater than those in the subsoil (16-30 cm). They also were higher than the recommended controlling values, or reached the class 5 of the Quantity Criteria for Heavy Metals in Soils, which was considered toxicity. The total quantity of heavy metals extracted by aqua regia had the similar tendency in distribution and concentration. This great soil contamination might be attributed to the long-term feeding of heavy metals. It indicated that the cumulative heavy metals in the soils of irrigation area have been overloading.

並列關鍵字

Paddy soil ； Heavy metals