Sensitization for Determination of Iron by Microwave Plasma Torch Atomic Emission Spectrometry†

doi:10.7503/cjcu20160771

Abstract

Abstract:

The sensitizing effects of surfactant and lanthanum on the determination of iron by microwave plasma torch atomic emission spectrometry(MPT-AES) were studied to solve the low detection sensitivity and weak resistance to matrix interference under low-power working condition using argon as carrier gas and working gas. The operating conditions and the influence of coexisting elements on the determination of iron were investigated in detail. The results show that the non-ionic surfactant has an inhibiting effect on the determination of iron, while cationic surfactant and lanthanum chloride have a sensitizing effect, and the lanthanum salt shows the best effect. Lanthanum salts used as sensitizer can not only increase the sensitivity of MPT-AES determination of iron, but also increase the allowable amount of coexisting elements. When the concentration of La³⁺ in the test system is 0.500 mg/mL, the determination of iron could not be interfered by at least 40 times of zinc, 30 times of cobalt, 20 times of nickel and manganese, 15 times of calcium, 10 times of magnesium, copper and sodium. The emission intensity of iron increased up to 2.4 times, and the detection limit decreased from 27.5×10^-3 μg/mL to 8.5×10^-3 μg/mL when using lanthanum salts as sensitizer. The method was applied to the determination of iron in crude oil samples, and the measured results agree with that obtained by flame atomic absorption spectrometry.

Key words: Microwave plasma torch atomic emission spectrometer, Iron, Sensitization, Lanthanum

CLC Number:

O657.31

TrendMD:

LI Jiahui, ZHANG Qikai, ZHAO Shanlin, LI Ping. Sensitization for Determination of Iron by Microwave Plasma Torch Atomic Emission Spectrometry^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 547.

Figures/Tables 9

Fig.1 Effects of different surfactants on iron emission intensity

Fig.2 Effect of lanthanum on iron emission intensity

Fig.3 Effect of sensitizer combined on iron emission intensity

Fig.4 Effect of power on iron emission intensity

Fig.5 Effect of carrier gas flow on iron emission intensity

Fig.6 Effect of working gas flow on iron emission intensity

Fig.7 Standard curve of iron

Fig.8 Effect of acid on iron emission intensity

Table 1 Analytical results of iron in crude

Sample No.	Method	Found/(μg·g^-1)	Average/(μg·g^-1)	RSD(%)
1	MPT-AES	41.0, 40.8, 41.5, 43.1, 42.5, 41.8	41.8	2.1
	FAAS	40.8, 41.6, 43.7, 42.8, 42.0, 41.6	42.1	2.4
2	MPT-AES	26.5, 26.4, 26.9, 27.6, 26.4, 26.5	26.7	1.8
	FAAS	28.1, 27.4, 25.7, 26.6, 28.2, 27.9	27.3	3.6

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