河川水樣微量金屬在液相與懸浮固體分配

Trace metals partition between aqueous and solid phase in a river water

賴佑昇(Yu-sheng Lai)

指導教授 ： 陳庭堅

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2014年)

https://doi.org/10.6346/NPUST.2014.00207

摘要

重金屬是環境常見污染之一，而重金屬在環境的濃度與分配影響重金屬在環境的宿命，生物毒性與傳輸。本研究分別收集河水水樣與顆粒懸浮固體(SPM)以及萃取SPM之水溶性有機質(WEOM)與腐質植(HS)。水樣、WEOM與HS溶液利用掃流式超濾器將溶液分離不同分子量溶液，各種樣品分別量測重金屬與溶解性有機碳濃度。水樣與SPM皆以Cu濃度最高，Mn次之，最低為Ni。水樣Cu、Mn、Ni皆是與小分子量DOM結合，Cu、Mn、Ni單位有機碳濃度受碳源與金屬的濃度影響變異大。HS原液的濃度約是WEOM的2 - 10倍，但是WEOM的碳吸附濃度高於HS的碳吸附濃度。固液相金屬分配係數log KP介於3.6-4.5 (L/kg)，大小依序為Ni > Cu > Mn。HS之銅與鎳之萃取質量大於WEOM之溶解與量，但是錳則是WEOM大於HS。液相膠體金屬與真溶解相金屬之平均分佈係數(Koc)介於0.39-1.09，大多數小於1.0同時，金屬Koc與金屬濃度比例有正相關性。
關鍵字 : 微量金屬、顆粒懸浮固體、掃流式分離設備、分配係數

關鍵字

微量金屬 ； 顆粒懸浮固體 ； 掃流式分離設備 ； 分配係數

並列摘要

Heavy metal pollution is a common environmental pollution around the world. The concentration and distribution of heavy metals affect their fate, toxicity and transport in the environment. This study collected water samples and suspended particulate matters (SPM) from river water. The water dissolved organic matter (WEOM) and humic substances (HS) solutions were extracted from the SPM samples. The filtrate, WEOM, and HS solutions were separated into different molecular weight solution with tangential flow ultrafiltration. All the samples measured concentrations of heavy metal and dissolved organic carbon. Samples of filtered water and SPM showed that highest concentration was Cu, followed by Mn, and the lowest concentration was Ni. In the water samples, low molecular weight dissolved organic matter (DOM) had the highest Cu, Mn, and Ni fractions. However, Cu, Mn, and Ni concentrations with organic carbon were influenced by the source of organic carbon and metal having the greatest variations. Heavy metal concentrations in HS were about 2 to 10 fold the concentrations in WEOM. However, metal concentrations with organic carbon in WEOM were greater than the concentrations in HS. Average heavy metal partition coefficients, log Kp, ranged from 3.6 to 4.5 (L/kg) between water and SPM samples and the order of log Kp was Ni > Cu > Mn. The Cu and Ni masses in HS were greater than the mass in WEOM, but the Mn mass in WEOM was greater than in the HS. The heavy metal distribution coefficients, Koc, between the high and low molecular weight DOM of the water samples ranged from 0.39 to 1.09, while the majority of Koc was less than 1.0. Moreover, Koc values had a positive correlation with corresponding metal concentration ratios.
Keyword:Trace metals、Suspended particulate matter、Tangential flow ultrafiltration、Partition coefficient

並列關鍵字

Trace metals ； Suspended particulate matter ； Tangential flow ultrafiltration ； Partition coefficient

參考文獻

行政院環境保護署環境檢測所，2003，土壤中重金屬檢測方法-王水消化法 NIEA S321.63B

Ashworth, D. and Alloway, B., 2004, "Soil mobility of sewage sludge-derived dissolved organic matter, copper, nickel and zinc," Environmental Pollution, Vol. 127, No. 1, pp. 137-144.

Baeyens, W., Elskens, M., Gillain, G., and Goeyens, L., "Biogeochemical behaviour of Cd, Cu, Pb and Zn in the Scheldt estuary during the period 1981–1983," in Trace Metals in the Westerschelde Estuary: A Case-Study of a Polluted, Partially Anoxic Estuary, Springer, 1998, pp. 15-44.

Balls, P., 1989, "The partition of trace metals between dissolved and particulate phases in European coastal waters: a compilation of field data and comparison with laboratory studies," Netherlands Journal of Sea Research, Vol. 23, No. 1, pp. 7-14.

Barber, L. B., Leenheer, J. A., Noyes, T. I., and Stiles, E. A., 2001, "Nature and transformation of dissolved organic matter in treatment wetlands," Environmental science & technology, Vol. 35, No. 24, pp. 4805-4816.