An optimal separation method for high-precision K isotope analysis by using MC-ICP-MS with a dummy bucket

doi:10.1039/d0ja00127a

	An optimal separation method for high-precision K isotope analysis by using MC-ICP-MS with a dummy bucket
	Li, Xiaoqiang 3; Han, Guilin 3; Zhang, Qian 1,3; Miao, Zhuang 2
刊名	JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
	2020-07-01
卷号	35 期号:7 页码:1330-1339
ISSN号	0267-9477
DOI	10.1039/d0ja00127a
通讯作者	Han, Guilin(hanguilin@cugb.edu.cn)
英文摘要	Previous studies have shown that significant K isotope fractionation is found in continental weathering, oceanic crust subduction, and plant growth, suggesting that K isotopes could be a potentially important tracer. However, the complicated separation method and analytical conditions limit the precise analysis of potassium isotopes via MC-ICP-MS under "cold" plasma conditions. Here, an improved separation method (single column) permits the complete purification of K from the matrix elements. This method is efficient and convenient and achieves a high yield (99.5 + 0.6%) and low blank (<10 ng K) under complex matrix extraction conditions. The high-resolution mode with a desolvating nebulizer system was used to increase the signal intensity of K-41(+) and K-39(+) and reduce (ArH+)-Ar-38, (ArH+)-Ar-40, and some oxide/nitride interference. To eliminate scattered ions or secondary electrons, we used a new dummy bucket to collect high intensity Ar-40(+) beams. Besides, potassium isotopes for the standard SRM 3141a and new geological, environmental and biological reference materials such as DNC-1a, JMS-2, and GSB-14 were determined on a Nu Plasma 3 MC-ICP-MS instrument. Overall, the reproducibility of K isotope analysis was better than +/- 0.06 parts per thousand (2SD) that reported in most laboratories around the world. The measured delta K-41 values of the rock samples are homogeneous, consistent with the previous published data. However, the K isotope composition in soils, sediments, and plants is inhomogeneous and varies greatly from similar to 0.85 parts per thousand to -0.25 parts per thousand. These results show that potassium isotopes have great application potential in the geological, environmental, and biological fields.
资助项目	National Natural Science Foundation of China[41661144029] ; National Natural Science Foundation of China[41325010]
WOS关键词	RELATIVE ABUNDANCE ; POTASSIUM ISOTOPES ; PLASMA ; LI ; CALCIUM ; LITHIUM ; SAMPLES ; RATIOS ; MATRIX ; INTERFERENCES
WOS研究方向	Chemistry ; Spectroscopy
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000546175500048
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162426]
专题	中国科学院地理科学与资源研究所
通讯作者	Han, Guilin
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.China Univ Geasci Beijing, Inst Earth Sci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaoqiang,Han, Guilin,Zhang, Qian,et al. An optimal separation method for high-precision K isotope analysis by using MC-ICP-MS with a dummy bucket[J]. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,2020,35(7):1330-1339.
APA	Li, Xiaoqiang,Han, Guilin,Zhang, Qian,&Miao, Zhuang.(2020).An optimal separation method for high-precision K isotope analysis by using MC-ICP-MS with a dummy bucket.JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,35(7),1330-1339.
MLA	Li, Xiaoqiang,et al."An optimal separation method for high-precision K isotope analysis by using MC-ICP-MS with a dummy bucket".JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 35.7(2020):1330-1339.