A new phosphate purification method for igneous weathering profiles

doi:10.1002/rcm.9601

	A new phosphate purification method for igneous weathering profiles
	Guan, Chengguo 1; Peng, Yongbo 2,3,6; Wei, Ziran 4; Gong, Shanggui 5; Bao, Huiming 2,3
刊名	RAPID COMMUNICATIONS IN MASS SPECTROMETRY
	2023-09-30
卷号	37 期号:18 页码:9
ISSN号	0951-4198
DOI	10.1002/rcm.9601
通讯作者	Peng, Yongbo(ybpeng@nju.edu.cn)
英文摘要	RationaleThe oxygen isotope composition of phosphate (& delta;O-18(PO4)) is widely employed for reconstructing paleotemperature and tracing biogeochemical phosphorus cycling. However, existing phosphate purification protocols do not work well for igneous rocks and igneous weathering profiles (IWPs). A reliable purification method is needed for measuring & delta;O-18(PO4) in these materials. MethodsOur phosphate purification method includes two steps of cation exchange resin treatment separated by a step of calcium phosphate precipitation (R-Ca-R method). In addition, the silver phosphate precipitation in our procedure is featured by slow evaporation to crystallization until the appearance of ammonium nitrate or silver nitrate crystals. We evaluated our methods on weathered and pristine igneous rocks, phosphorite rocks, KH2PO4, and (NH4)(2)HPO4 solutions. ResultsOur purification method converted over 99.9% phosphate in solution to calcium phosphate, which can be easily decalcified by cation resin. The improved silver phosphate precipitation method produced high phosphate yields (97.1%-99.5%) and retained original & delta;O-18(PO4) within analytical uncertainty (2 & sigma; = 0.6 & PTSTHOUSND;). We applied the purification and precipitation method on five igneous rocks and IWPs, and obtained & delta;O-18(PO4) values ranging from 6.4 & PTSTHOUSND; to 8.0 & PTSTHOUSND;. Duplicate phosphate extractions yielded & delta;O-18(PO4) values differing by less than 0.3 & PTSTHOUSND;. ConclusionsWe developed a new phosphate purification method that is applicable to phosphate extraction in igneous rocks and IWPs. We also proposed a reliable indicator for the termination of silver phosphate precipitation. Our method can achieve high phosphate yield and reproducible & delta;O-18(PO4) value.
资助项目	National Key Research and Development Program of China[2022YFF0800303] ; National Natural Science Foundation of China[42173001] ; National Natural Science Foundation of China[42192501] ; National Natural Science Foundation of China[42072036] ; National Natural Science Foundation of China[41906046] ; Fundamental Research Funds for the Central Universities[0206/14380150] ; Fundamental Research Funds for the Central Universities[0206/14380185] ; Fundamental Research Funds for the Central Universities[0206/14380174] ; Chinese Academy of Sciences[XDB26000000]
WOS关键词	OXYGEN-ISOTOPE ANALYSIS ; INORGANIC-PHOSPHATE ; PRECISE METHOD ; DELTA-O-18 ; TEMPERATURES ; EXCHANGE ; APATITE ; WATER
WOS研究方向	Biochemistry & Molecular Biology ; Chemistry ; Spectroscopy
语种	英语
出版者	WILEY
WOS记录号	WOS:001042976700001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42575]
专题	中国科学院南京地质古生物研究所
通讯作者	Peng, Yongbo
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China 2.Nanjing Univ, Int Ctr Isotope Effects Res, Nanjing, Peoples R China 3.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Sch Earth Sci & Engn, Nanjing, Peoples R China 4.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY USA 5.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai, Peoples R China 6.Nanjing Univ, Int Ctr Isotope Effects Res, Nanjing 210023, Peoples R China
推荐引用方式 GB/T 7714	Guan, Chengguo,Peng, Yongbo,Wei, Ziran,et al. A new phosphate purification method for igneous weathering profiles[J]. RAPID COMMUNICATIONS IN MASS SPECTROMETRY,2023,37(18):9.
APA	Guan, Chengguo,Peng, Yongbo,Wei, Ziran,Gong, Shanggui,&Bao, Huiming.(2023).A new phosphate purification method for igneous weathering profiles.RAPID COMMUNICATIONS IN MASS SPECTROMETRY,37(18),9.
MLA	Guan, Chengguo,et al."A new phosphate purification method for igneous weathering profiles".RAPID COMMUNICATIONS IN MASS SPECTROMETRY 37.18(2023):9.