Detection of Common Transition Metal in Water by Microwave Plasma Torch Mass Spectra in Negative Ion Mode†

doi:10.7503/cjcu20150927

Abstract

Abstract:

The microwave plasma torch(MPT) is a novel ambient ion source with multi-advantages, including low-power consumption, easy operation, simple construction, strong excitation ability, and so on. Previous studies showed that the MPT ion source coupled with a mass spectrometer is a promising analytical tool in various fields. Adopting the desolvation unit and the central-tube injection of MPT, the MPT mass spectrometer can detect directly the metal ions in water, without tedious sample pretreatment. And this instrumental method is sensitive enough for some toxic heavy metals with limit of detection(LOD) down to the level of several 10^-8 g/L. For instance, for lead and cadmium, the LOD values can reach 20×10^-9 and 71×10^-9 g/L, respectively. Thus the MPT mass spectrometer can be used as the supplementary of ICP-MS and have potential applications in field analysis. To expland the applications of microwave plasma torch(MPT)-MS in metal element analysis in water, the further researches about the feature MPT mass spectra of transition metal elements are necessary. This article presented firstly the MPT mass spectra of some common transition metal elements in negative ion mode of linear ion trap(LTQ) mass spectrometer and clarified the regularity of the metallic anions. These metals include: manganese, iron, cobalt, nickel, copper and zinc. Moreover, primer results showed that the LOD for these transition metal ions in water are the levels of 10^-5 g/L. These results established the basic of the practical applications of MPT mass spectrometer in the fields of environment controlling and the water quality inspection.

Key words: Microwave plasma torch, Transition metal, Negative ion mode, Ambient ion source

CLC Number:

O657

TrendMD:

XIONG Xiaohong, ZHANG Yan, ZHOU Runzhi, WANG Shangxian, JIANG Tao, ZENG Bin, QI Wenhao, ZHU Zhiqiang. Detection of Common Transition Metal in Water by Microwave Plasma Torch Mass Spectra in Negative Ion Mode^†[J]. Chem. J. Chinese Universities, 2016, 37(5): 867.

Figures/Tables 6

Fig.1 Background MPT mass spectrum in negative ion modeInset is the two stage mass spectrometry.

Fig.2 MPT mass spectra of manganese(A) and iron(B) in negative ion modeInset of (A) is the CID result.

Fig.3 MPT mass spectra of cobalt(A), nickel(B), copper(C) and zinc(D) in negative ion mode

Fig.4 MPT MSn mass spectra of copper in negative ion mode(n=2, 3)(A)63Cu(NO3)2-; (B) 65Cu(NO3)2-; (C)63CuO(NO3)-; (D) 65CuO(NO3)-.

Table 1 LOD of MPT-LTQ MS and ICP-MS(μg/L) and the comparasion with national standard of China

Element	Fitting equation	R²	Linear range	Recovery rate(%)	RSD (n=6,%)	LOD of MPT-LTQ MS in negative ion mode	LOD of ICP^[2]	Upper bound in GB 5749.6-2006
Mn	y=0.4634x-1.587	0.9899	1—100	121.00	1.3—11	0.685	0.06	100
Fe	y=11.01x-24.01	0.9979	1—100	124.60	1.9—12	0.270	0.90	300
Co	y=10.758x-20.06	0.9954	1—100	123.60	1.2—17	0.135	0.03
Ni	y=2.125x-12.43	0.9949	1—250	120.70	3.4—13	0.122	0.07	20
Cu	y=10.175x-22.725	0.9982	1—100	110.11	2.1—10	2.117	0.09	1000
Zn	y=0.144x-1.692	0.9963	1—500	117.23	4.7—19.6	1.486	0.80	1000

Fig.5 Calibration curves of Mn(A), Fe(B), Co(C), Ni(D), Cu(E) and Zn(F)

References 23

[1]	Frieden E., Biochemistry of the Essential Ultratrace Elements, Kluwer Academic Publishers Group, Dordrecht, Netherlands, 1984, 1—15
[2]	The Ministry of Health of the People's Republic of China & the National Standardization Management Committee of China, GB 5749.6-2006. Standards for Drinking Water Quality, Standards Press of China, Beijing, 2007
	(中华人民共和国卫生部&中国国家标准化管理委员会, GB 5749.6-2006. 生活饮用水标准, 北京: 中国标准出版社出版, 2007)
[3]	The Ministry of Health of the People's Republic of China & the National Standardization Management Committee of China, GB 5750.6-2006, Standard Examination Methods for Drinking Water Quality, Standards Press of China, Beijing, 2007
	(GB 5750.6-2006, 中华人民共和国卫生部&中国国家标准化管理委员会, 生活饮用水标准检验方法-金属指标, 北京: 中国标准出版社出版, 2007)
[4]	Zhang L. L., Wong X. H., Li X. C., Li Y. C., Yu H. Z., Anal.Chem., 2015, 87, 5062—5067
[5]	Jin Q. H., Modern ScientificInstruments, 2002, 4, 3—11
	(金钦汉. 现代科学仪器, 2002, 4, 3—11)
[6]	Jin Q. H., Chin. J. Anal.Chem., 1988, 16(7), 668—674
	(金钦汉. 分析化学, 1988, 16(7), 668—674)
[7]	Zhou W., Xiong H. L., Feng G. D., Yu A. M., Chen H. W., Spectrosc. Spect.Anal., 2014, 34(6), 1671—1674
	(周炜, 熊海龙, 冯国栋, 于爱民. 光谱学与光谱分析, 2014, 34(6), 1671—1674)
[8]	Xiong X.H., Jiang T., Qi W. H., Zuo J., Yang M. L., Fei Q., Xiao S. J., Yu A. M., Zhu Z. Q., Chen H. W.,Int. J. Anal. Chem., 2015, DOI: 10.1155/2015/156509
[9]	Shi Y. H., Liang Y., Ru X., Yu C., Yu A. M., Zhang H. Q., Jin Q. H., Chin. J. Anal.Chem., 2009, 37(Z1), A029
	(师宇华, 梁悦, 茹鑫, 于翠, 于爱民, 张寒琦, 金钦汉. 分析化学, 2009, 37(Z1), A029)
[10]	Zhang J. S., Li L. H., Jin Q. H., Chin. J. Anal.Chem., 2005, 33(5), 690—694
	(张金生, 李丽华, 金钦汉.分析化学, 2005, 33(5), 690—694)
[11]	Meng H., Feng G. D., Huan Y. F., Jiang J., Wang S. H., Jin Q. H., Chin. J. Anal.Chem., 2005, 33(5), 744
	(孟辉, 冯国栋, 郇延富, 姜杰, 汪淑华, 金钦汉. 分析化学, 2005, 33(5), 744)
[12]	Zhang J. S., Li L. H., Jin Q. H., Chin. J. Anal.Lab., 2004, 23(7), 31—33
	(张金生, 李丽华, 金钦汉. 分析实验室, 2004, 23(7), 31—33)
[13]	Zhang T. Q., Jin W., Zhou J. G., Zhang Y., Zhu Z. Q., Zhou W., Jin Q. H., Chem. J. Chinese Universities,2012, 33(9), 1938—1944
	(张体强, 金伟, 周建光, 张莹, 朱志强, 周炜, 金钦汉. 高等学校化学学报, 2012, 33(9), 1938—1944)
[14]	Zhang T. Q., Zhou W., Jin W., Zhou J. G., Eric H., Zhu Z. Q., Chen H. W., Jin Q. H., J. MassSpectrom., 2013, 48, 669—676
[15]	Zhou W., Xiong H. L., Yang M. L., Chen H. W., Qu Y., Zhang X. L., Fang X. W., Rock MineralAnal., 2014, 33(6), 782—788
	(周炜, 熊海龙, 杨美玲, 陈焕文. 岩矿测试, 2014, 33(6), 782—788)
[16]	Duan Y. X., Du X. G., Liu J., Jin Q. H., Liu M. Z., Shi W., Chin. J. Anal.Chem., 1993, 21(5), 610—614
	(段忆翔, 杜晓光, 刘军, 金钦汉, 刘明钟, 施文. 分析化学, 1993, 21(5), 610—614)
[17]	Li X. P., Li L. H., Zhang J. S., Chin J. Anal.Science, 2007, 23(3), 319—322
	(李秀萍, 李丽华, 张金生. 分析科学学报, 2007, 23(3), 319—322)
[18]	Yu A. M., Zhang H. Q., Jin Q. H., Liu X. J., Chin. J. Anal.Chem., 1993, 21(11), 1320—1322
	(于爱民张寒琦, 金钦汉, 刘晓晶. 分析化学, 1993, 21(11), 1320—1322)
[19]	Jiang J., Fei Q., Feng G. D., Dou W. C., Li M., Jin Q. H., Jin W., Chin. J. Anal.Chem., 2007, 35(1), 91—94
	(姜杰, 费强, 冯国栋, 窦文超, 李明, 金钦汉, 金伟. 分析化学, 2007, 35(1), 91—94)
[20]	Jiang T., Xiong X. H., Wang S. X., Luo Y. L., Fei Q., Yu A. M., Zhu Z. Q., Int. J. MassSpectrom., 2016, 399/400, 33—39
[21]	Jiang T., Liu Q. J., Yi L. F., Qi W. H., Zeng B., Zhou Y. M., Zhu Z. Q., Chen H. W., J. InstrumentalAnal., 2016, 35(1), 79—84
[22]	Liu C. X., Zhang X. L., Xiao S. J., Jia B., Cui S. S., Shi J. B., Xiu N., Xie X., Gu H. W., Chen H. W., Talanta, 2012, 98, 79—85
[23]	Xu N., Zhu Z. Q., Yang S. P., Wang J., Gu H. W., Zhou Z., Chen H. W., Chin. J. Anal.Chem., 2013,41(4), 523—528
	(许柠, 朱志强, 杨水平, 王姜, 顾海巍, 周振, 陈焕文.分析化学, 2013, 41(4), 523—528)