Determination of Trace-amount Calcium in Drinking Water by Microwave Plasma Torch Mass Spectrometry†

doi:10.7503/cjcu20150503

Abstract

Abstract:

A method for the determination of trace-amount calcium in drinking water by common organic mass spectroscopy was developed. Meanwhile, microwave plasma torch was introduced as ionization source and low-cost ion trap was introduced as mass analyzer. The operation parameters including flow rates of working gas and carrying gas were studied and optimized. Under the optimal experimental conditions, the micro-amount calcium in well water, tap water and bottled water were determined. In order to minimize the matrix effects in the real samples, the standard addition analysis method was employed. The limit of detection was 3.88 ng/L, and the relative standard deviations(RSD) were 2.87%—8.04%. Recoveries were determined between 101.3% and 115.1%. Experimental results indicated that the novel analytical strategy based on MPT-LTQ-MS for qualitation and quantitation of micro-amount calcium in drinking waters was simple and convenient. And its precision and accuracy meet the demand of determination. Furthermore, compared with ICP-MS, MPT-LTQ-MS was low-cost including instrument and maintenance. The proposed method is a novel and promising strategy for detection of micro-amount calcium in drinking waters.

Key words: Microwave plasma torch, Ion trap, Mass spectroscopy, Drinking water, Calcium

CLC Number:

O657.6

TrendMD:

ZHONG Tao, YANG Meiling, PEI Miaorong, ZHANG Xinglei, LE Zhanggao, WANG Guangcai, CHEN Huanwen. Determination of Trace-amount Calcium in Drinking Water by Microwave Plasma Torch Mass Spectrometry^†[J]. Chem. J. Chinese Universities, 2016, 37(1): 26.

Figures/Tables 7

Fig.1 Experimental schematic of MPT-MS

Fig.2 MPT-MSn spectra of standard solution of calcium^(A) MPT-MS spectrum; (B) MS2 spectrum of m/z 138; (C) MS3 spectrum of m/z 138.

Fig.3 Experimental(a) and theoretical(b) high resolution mass spectra of standard solution of calcium ^ (A) [Ca(NO3)·3H2O]+; (B) [Ca(NO3)·2H2O]+; (C) [Ca(NO3)·H2O]+.

Fig.4 Optimization parameters of MPT working conditions^ (A) Flow rate of carrier gas; (B) flow rate of support gas.

Fig.5 Calibration curve of calcium

Table 1 Detection results of real samples

Sample	Dilution factor	Linear equation	Correlation coefficient	Determined/(μg·L^-1)
Nongfu spring	10	y=71.56x+37184	0.993	520.0
Huosanmi	100	y=43.79x+2345	0.994	54.0
Tap water	100	y=44.85x+6326	0.994	141.0
Well water	100	y=60.80x+1311	0.990	21.6
Kunlun	100	y=61.53x+13726	0.999	223.0
Bamalilang	100	y=59.40x+20807	0.998	342.0

Table 2 Recoveries of real samples

Sample	Added/(μg·L^-1)	Founded/(μg·L^-1)	Recovery(%)	RSD(%)
Nongfu spring	500	526	105.2	3.49
Huosanmi	50	54	107.8	8.04
Tap water	150	152	101.3	2.87
Well water	20	23	115.1	6.69
Kunlun	200	229	114.5	3.64
Bamalilang	350	373	106.5	5.79

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