Effects of salinity and particle size on radium desorption from river sediments in the Qinghai-Tibet Plateau

doi:10.1016/j.jenvrad.2021.106771

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	Effects of salinity and particle size on radium desorption from river sediments in the Qinghai-Tibet Plateau
	Su, Weigang; Ma, Yujun; Wang, Qiugui; Yan, Qiongxiong; Lu, Xiaohang; Ma, Zhe; Yi, Lei; Liu, Xiaobao; Chen, Fuhong; Han, Fengqing; Xu, Zhengfan
	2021-11
发表期刊	JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
ISSN	0265-931X
卷号	241
摘要	Natural radium isotopes have been widely used to study groundwater discharge in different systems. Therefore, it is of great significance to understand the desorption behavior of radium isotopes on sediments to trace waterland exchange processes. However, there is very limited studies observing the desorption Ra isotopes to lake water of the brine lake. Ra-224 desorption experiments with different salinities and particle sizes were carried out by collecting samples of brackish water from Qinghai Lake, brine from Dabuxun Lake and river sediments entering the lakes. The results show that the desorption activity of Ra-224 from the river sediments to lake water of Qinghai Lake is 0.2 dpm/g when the salinity is 10.07 parts per thousand. The maximum desorption activity of Ra-224 from river sediments to lake water of Dabuxun Lake is 0.195 dpm/g at a salinity of 40.81 parts per thousand. A salinity of 41.81 parts per thousand and particle size of 16.28 mu m are the threshold points affecting the desorption behavior of Ra. When the salinity is less than 40.81 parts per thousand, the desorption activity of Ra increases linearly with increasing salinity. When the salinity is greater than 40.81 parts per thousand, the desorption activity of Ra decreases nonlinearly with increasing salinity and tends toward a stable low value. When the particle size is larger than 16.28 mu m, the small particle size promotes desorption. The smaller the particle size is, the greater the desorption activity is. When the particle size is less than 16.28 mu m, the small particle size inhibits desorption. The smaller the particle size is, the smaller the desorption activity. The co-precipitation of Ra2+ with supersaturated Ca2+, SO42- and other ions may be the main reason for the threshold point of salinity and particle size in Ra desorption process in salt lake system.
DOI	10.1016/j.jenvrad.2021.106771
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34599
专题	盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Su, Weigang,Ma, Yujun,Wang, Qiugui,et al. Effects of salinity and particle size on radium desorption from river sediments in the Qinghai-Tibet Plateau[J]. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY,2021,241.
APA	Su, Weigang.,Ma, Yujun.,Wang, Qiugui.,Yan, Qiongxiong.,Lu, Xiaohang.,...&Xu, Zhengfan.(2021).Effects of salinity and particle size on radium desorption from river sediments in the Qinghai-Tibet Plateau.JOURNAL OF ENVIRONMENTAL RADIOACTIVITY,241.
MLA	Su, Weigang,et al."Effects of salinity and particle size on radium desorption from river sediments in the Qinghai-Tibet Plateau".JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 241(2021).

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