京杭大运河(苏北段)底泥成分和砷形态的分布特征

Distribution Characters of Arsenic Speciation and Sediment Composition in Jing-Hang Grand Canal(Northern Section in Jiangsu Province)

用冷原子荧光仪对京杭大运河(徐州段)底泥中砷的总量和形态进行测定。研究结果表明,砷的污染已经达到中度水平,并且砷大部分是以钙型和包裹态形式存在。测定18个样品中有机碳(TOC)的含量和底泥的成分,结果表明,底泥的成分主要有石英、石膏,部分或少量的长石、方解石和粘土矿物,有机碳的含量与底泥的成分不能决定砷的总量和形态的分布。

Eighteen bottom sediments of Jing-Hang Grand Canal （northern section in Jiangsu Province） were taken as the research subject, The total amount and form of arsenic were analyzed by cold atomic fluorophotometry. Result showed that the main fractions were Ca-As and 0-As, X- ray （XRD） was used for the characterization of the mineral composition. The main components in bottom sediment were quartz and feldspar. No noticeable composition changes were observed from the upstream to downstream. At different locations arsenic had different amount and fractions, which was not affected by TOC and the composition of bottom sediment.