Distribution of Arsenic and Lead in the Sediments in Hot Spring Area of Huang Gang Creek, Beitou
Date Issued
2007
Date
2007
Author(s)
Chen, Wei-Chin
DOI
zh-TW
Abstract
Over 100 hectare paddy soils were found heavily polluted by arsenic through long-term irrigation with the water mixed with hot spring, in 2006 at Beitou, Taiwan. Moreover, in Taiwan it is the first time the beudantite was found on the bank and streambed of a nearby Huang Gang creek. The objective of this study is to investigate the distribution of arsenic and lead concentrations in the sediments of Huang Gang creek. 49 samples were collected along the creek about 4.6 km long. All samples were sieved to fine-grained fractions: 1.19-0.84 mm, 0.84-0.15 mm, 0.15-0.075 mm, 0.075-0.05 mm and<0.05 mm, prior to analysis. The results show that finer grained sediment samples tend to have higher concentrations of As and Pb. Samples were sieved to 1.19-0.84 mm had the mean concentrations of As and Pb 229 (with median 136) mg kg-1, and 182 (with median 119) mg kg-1 respectively; while the samples sieved to 0.05 mm had the mean concentrations of As and Pb 790 (601) mg kg-1, and 807 (636) mg kg-1. In general, the concentration of arsenic is higher than that of lead in all sediment samples, and the ratio is in the range between 1.29-1.4; the molar ratio is between 3.58-3.88. It is apparently different from the molar ratio (ratio=1) of beaudantite. The samples from paddy soils and stream sediments with the same particle size, <0.05mm, are compared with the As and Pb content, and it shows that the difference is marked. Therefore, the major cause of the As and Pb pollution of paddy soils seems to be not from sediments
Subjects
砷
鉛
底泥
粒徑
溫泉
Arsenic
lead
sediment
particle-size
hot spring
Type
thesis
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