Determination of available copper, zinc, iron and manganese incalcareous soil by inductively coupled plasma mass spectrometrywith diethylenetriaminepentaacetic acid extraction
LUO Zhi-ding, ZHANG Ning*, WANG Jing-gong, LIU Qing-xue, LI Xing, JIANG Yun-jun
Hebei Research Center for Geoanalysis, Baoding 071051, China
Abstract：The available Cu, Zn, Fe and Mn in calcareous soil sample were extracted by diethylenetriaminepentaacetic acid (DTPA). Since the contents of matrix salts in sample solution were high, the sampling cone and skimmer cone of instrument were easily blocked if the sample solution was directly determined by inductively coupled plasma mass spectrometry (ICP-MS). The salification in atomizing chamber and torch tube would influence on the determination accuracy. After leaching sample with DTPA, the sample solution was diluted for 10-30 times. Meanwhile, DPTA solution was added into standard solution series for matrix matching to eliminate the matrix interference. The mass spectrometry interference of polyatomic ion 40Ar16O with the determination of 56Fe was eliminated using helium collision mode. Consequently, the determination of available Cu, Zn, Fe and Mn in calcareous soil by ICP-MS was realized. The flow rate of helium was optimized and the optimum flow rate was 4.5mL/min. Under the optimized experimental conditions, the mass concentration of elements had linear relationship with the counting value for Cu, Zn (5-200ng/mL), Fe (100-3000ng/mL) and Mn (30-1000ng/mL). The correlation coefficients were all not less than 0.9998. The detection limit was 0.003-0.01mg/kg. The contents of available Cu, Zn, Fe and Mn in certified reference materials of soil for available composition analysis were determination according to the experimental method. The found results were consistent with the certified values, and the relative standard deviations (RSD) were between 1.3% and 3.1%. The proposed method was compared with the standard method HJ 804-2016 (inductively coupled plasma atomic emission spectrometry), and the determination results were basically consistent.
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LUO Zhi-ding, ZHANG Ning, WANG Jing-gong, LIU Qing-xue, LI Xing, JIANG Yun-jun. Determination of available copper, zinc, iron and manganese incalcareous soil by inductively coupled plasma mass spectrometrywith diethylenetriaminepentaacetic acid extraction. , 2019, 39(1): 42-47.
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