|Abstract: ||本研究在106年7月與12月至淡水河河口海域採樣，分析樣水中溶解態與懸浮態十種重金屬元素濃度，溶解態重金屬元素的分析使APDC+DDDC /Freon萃取濃縮方法，懸浮態重金屬元素濃度的分析使用二階段分析，分別使用1N HCl萃取，此物種稱為生物可利用相濃度，之後再用王水與氫氟酸進行總消化，此物種稱為殘留相濃度，以了解重金屬元素在淡水河河口海域分佈的情形及其地化行為。溶解態重金屬元素濃度範圍為:銀<0.04-2.58 nM;鎘<0.01-0.14 nM;鈷0.13-5.22 nM;鉻(VI)1.15-32.47 nM;銅0.51-31.37 nM;鐵：7.32-87.3 nM;錳1.44-37.74 nM;鎳6.98-52.74 nM;鉛0.03-1 nM與鋅1.52-9.85 nM，這些元素在淡水河河口海域的濃度分佈，大都呈現增加行為分佈，顯示在上中游仍有來源輸入。懸浮態重金屬元素總濃度範圍為:銀<0.01-4.28 ug/g;鎘0.07-1.67 ug/g;鈷8.17-76.2 ug/g;鉻46.7-153.9 ug/g;銅6.95-423.8 ug/g;鐵20935-51919 ug/g;錳57.8-475 ug/g;鎳5.77-328.5 ug/g;鉛4.25-74.5 ug/g與鋅34.5-155.2 ug/g，懸浮態重金屬元素濃度，除了銀與鎘元素在生物可利用相濃度高於殘留相外，其它所有元素皆是殘留相濃度明顯高於生物可利用相濃度。此外，淡水河河口海域水中鐵、鉻、鉛與鋅元素濃度主要存在於懸浮態，而鈷、銅、錳與鎳元素倆次分析結果差異明顯，但銀、鎘與鎳元素濃度可能主要存在於溶解態。|
The distribution and partitioning of trace metals (Ag, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn) between dissolved and particulate phases were studied in the Danshuei River Estuary. The estuarine water samples were collected in July and December, 2017, and were analyzed the dissolved and particulate trace metal concentrations. The dissolved and particulate concentrations of trace metal in the water samples were pre-concentrated by the APDC+DDDC/Freon extraction method and a two-step, 1N HCl and aqua regia/HF total digestion, analytical method, respectively. The dissolved concentration ranges of trace metal in the estuarine water samples were as follow: Ag, <0.04-2.58 nM; Cd, 0.01-0.14 nM; Co, 0.13-5.22 nM; Cr(VI), 1.15-32.47 nM; Cu, 0.51-31.37 nM; Fe, 7.32-87.3 nM; Mn, 1.44-37.74 nM; Ni, 6.98-52.74 nM; Pb, 0.03-1 nM; and Zn, 1.52-9.85 nM. The distribution of these dissolved trace metals generally exhibited the addition behavior, suggesting a source input into the upper and middle estuary of the Danshuei River. The particulate concentration ranges of trace metal in the estuarine water samples were as follow: Ag, <0.01-2.07 ug/g; Cd, 0.04-1.15 ug/g; Co, 4.72-28.01 ug/g; Cr, 8.02-129.2 ug/g; Cu, 3.97-157.5 ug/g;Fe, 8329-24735 ug/g; Mn, 18.8-140.9 ug/g; Ni, 0.63-102.52 ug/g; Pb, 1.83-52.64 ug/g; and Zn, 11.21-57.96 ug/g. The particulate concentration of trace metals, except Ag and Cd, in the estuarine water samples were generally dominated in the residual fraction rather than the leachable fraction. While, the particulate concentrations of Ag and Cd, were dominated in the leachable fraction. Total concentrations of Fe, Cr, Pb and Zn in the estuarine water samples were mainly present in the particulate phase. In contrast, Ag, Cd, and Ni in the estuarine water samples were chiefly present in the dissolved phase. The partitioning of Co, Cu, Mn, and Ni is not easily specified because the partition variation of these metals was significant during the two surveys.