| 摘要: | 水體環境中底棲貝類等之生長、人為丟棄之牡蠣殼、農業碳酸鹽肥料及工業排放之碳酸鹽皆會增加底泥中碳酸鹽含量。本研究團隊針對南部六條河川(二仁溪、鹽水溪、曾文溪、急水溪、朴子溪、北港溪)底泥之研究結果，發現受污染嚴重之二仁溪及鹽水溪底泥中碳酸鹽含量會正相關於單位重量碳酸鹽中與碳酸鹽鍵結之重金屬量，可以線性相關數學模式表示：
M = A + B × (Metal bound to carbonates/Carbonates)
另四條河川因重金屬及碳酸鹽含量範圍變化小，故除Zn外線性相關性並不明顯。
朴子溪底泥碳酸鹽含量介於0.29至2.17%之間，鹽水溪底泥碳酸鹽含量介於0.05至0.96%之間。朴子溪受重金屬污染底泥中各種重金屬(Cu、Co、Cr、Ni、Zn及Pb)含量增加因子(Enrichment Factor)約在2.5-4.6倍(以底泥樣本中出現之最低金屬量作基準)，鹽水溪底泥受重金屬污染底泥中各種重金屬含量增加因子除Pb(9倍)外約在25倍以上，Cu最高可達134倍，顯示鹽水溪底泥受到高濃度重金屬污染。
Six main rivers (the Yenshui, Ell-ren, Tsengwen, Chishui, Potzu, and Peikang Rivers), located in southern Taiwan, were contaminated with heavy metals and carbonates in different level from industry, domestic, and agricultural wastewater. The carbonates content in the Yenshui and Ell-ren river sediment correlated significantly with heavy metal bound to per unit weight carbonates which could be expressed with linear empirical mathematic model as below.
M = A + B × (Metal bound to carbonates/Carbonates)
However, the linear correlations between the carbonates and heavy metals bound to per unit weight carbonates were not significant for the sediment collected from the Tsengwen, Chishui, Potzu, and Peikang Rivers which have lower heavy metals pollution, except Zn.
The carbonates concentration ranged from 0.29 to 2.17% for the Potzu river sediment, from 0.05 to 0.96% for the Yenshui river sediment. The enrichment factor of heavy metals (Cu, Co, Cr, Ni, Zn and Pb) in the Potzu river sediment ranged from 2.5 to 4.6 based on the concentration of heavy metals found at the river sediment. The enrichment factor of heavy metals (Cu, Co, Cr, Ni, and Zn) in the Yenshui river sediment were larger than 25, except fro Pb (9). The largest enrichment factor for Cu was 134. Those meant that the Yenshui river sediment was seriously polluted with heavy metals. |
