Page 103 - 理化检验-化学分册2025年第三期

王光惠，等：钠基体匹配法-电感耦合等离子体原子发射光谱法测定土壤中6种金属元素的含量

Determination of 6 Metal Elements in Soil by Inductively Coupled Plasma Atomic
Emission Spectrometry with Sodium Matrix Matching Method

WANG Guanghui, LI Heng, FENG Liping

(Hunan Hengyang Ecological Environment Monitoring Center, Hengyang 421001, China)
Abstract: At specific wavelengths, the effects of different mass concentrations of soil matrix and easily ionizable
elements on determination of 6 metal elements (zinc, manganese, copper, nickel, cobalt, and vanadium) by inductively coupled
plasma atomic emission spectrometry (ICP-AES) were compared. As shown by the results, a certain correlation between soil
matrix interference and easily ionizable element interference. Negative interference was observed for all 6 metal elements, with
significantly greater interference on copper, nickel and cobalt compared to zinc and vanadium. By selecting the sodium chloride
solution with sodium mass concentration of 1 000 mg · L −1 as the matrix for drawing calibration curves, the interference from the
soil matrix with a sample mass of 0. 3 g could be calibrated, thereby achieving accurate determination results. Using the sodium
matrix matching method, linear relationships between the corresponding emission intensities and mass concentrations of 6 metal
−1
elements were found in definite ranges, with detection limits (3. 14s) in the range of 0. 1-0. 5 mg · kg . Accuracy tests were
conducted on 6 soil composition analysis standard materials, and the relative errors of the determined values ranged from -3. 8%
to 4. 0%. Precision test was conducted on the soil composition analysis standard material GSS20, and RSDs (n=6) of the
determined values ranged from 1. 8% to 4. 0%. This method was applied to analysis of 3 different environmental soil samples, and
the obtained results were consistent with those of wavelength dispersive X-ray fluorescence spectrometry.
Keywords: easily ionizable element; inductively coupled plasma atomic emission spectrometry (ICP-AES); matrix matching
method; soil; metal element

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