大辽河口痕量元素砷的河口混合行为

研究了大辽河口痕量元素砷的河口混合行为.分别于2010年4、7、11月从大辽河口采集20个站位,采用氢化物发生原子荧光光谱法测定了溶解态砷的含量,目的是探讨大辽河口砷的来源及其分布的影响因素.大辽河口4、7、11月砷含量的变化范围分别为2.98～44.1、1.19～14.6、1.27～12.4μg.L-1;4月含量最高,7月次之,11月最低.不同季节其行为差别很大,7月其行为是保守的;4、11月在整个盐度范围其行为是非保守的,但在盐度1～30、10～30之间是保守的.不同季节河流砷的输送通量差异不大,4月起通量主要受砷浓度控制,11月主要由流量控制,7月由两者共同控制.7月河口通量主要来自于河流的输送,4、11月则主要来自河口内部.同世界上其他河口相比,大辽河口砷的含量处于较高的水平.

Mixing Behavior of Arsenic in the Daliaohe Estuary

Mixing behavior of arsenic in the Daliaohe Estuary was studied. Twenty samples were collected from the Daliaohe Estuary during April, July and November, 2010 and arsenic was determined by HG-AFS. The concentrations of arsenic varied from 2.98-44.1, 1.19-14.6, 1.27-12.4 microg x L(-1) in April, July and November. The seasonal variation of arsenic content was significant. In July, the concentration of arsenic was lower than that in April, and higher than that in November. The data indicated that arsenic did not behave conservatively in April and November, but behaved conservatively in July. An important mobilization of dissolved arsenic was observed from the river up to halfway in the estuary in April and November, 2010. Both input flux (from river to estuary) and output flux (from estuary to coastal zone) of dissolved arsenic were calculated from statistical interpretations of the salinity profiles. Concentration of arsenic in the Daliaohe Estuary is higher than large systems, like the Changjiang Estuary and Zhujiang Estuary.