Determination of available sulfur in soil from ionic rare earth ore area by inductively coupled plasma atomic emission spectrometric inner standard method with ultrasonic leaching
TANG Bi-yu, YANG Zhao-hong, CHEN Zhu-bing, QIU Li, SHI Yi-hua*
China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd., Guilin 541004, China
Abstract：During the mining process of ionic rare earth ore, a large amount of sulfur entered into the surrounding soil due to the injection of leaching solution of ore, which affected the environmental ecology and biological metabolism of ore area. The accurate determination of available sulfur in soil was of great significance for the environmental monitoring and protection of ionic rare earth ore area, the soil restoration and vegetation reconstruction of mining and tailings wasteland. A determination method of available sulfur in soil from ionic rare earth ore area by inductively coupled plasma atomic emission spectrometric inner standard method with ultrasonic leaching was established. The ultrasonic extraction conditions were tested and selected: phosphate-acetic acid was used as the leaching agent; the ultrasonic extraction time was 15min, which solved the problem of long time required for traditional shaking extraction; S 182.0nm was selected as the analytical line and 2mg/L of rhenium standard solution was used as the internal standard. The use of inductively coupled plasma atomic emission spectrometer (ICP-AES) greatly shortened the analytical procedures compared to the standard industrial method for the determination of available sulfur. The experimental results showed that the linearity was good for available sulfur in concentration range of 0.10-20.0mg/L, and the correlation coefficient was above 0.9999. The limit of detection was 0.08mg/kg. The precision and trueness were verified with certified reference materials of soil for available state component analysis, and the results were consistent with the standard values. The relative standard deviation (RSD, n=5) was less than 2%. Meanwhile, the proposed method and the industry standard method were both used to analyze the available sulfur in different types of soil from the ionic rare earth ore area for comparison analysis, and the results were consistent. It indicated that the proposed method could provide rapid and accurate data support for the environmental monitoring of available sulfur from ore area environment.
唐碧玉, 阳兆鸿, 陈祝炳, 邱丽, 施意华. 超声浸提-电感耦合等离子体原子发射光谱内标法测定离子型稀土矿区土壤中有效硫[J]. 冶金分析, 2020, 40(3): 57-61.
TANG Bi-yu, YANG Zhao-hong, CHEN Zhu-bing, QIU Li, SHI Yi-hua. Determination of available sulfur in soil from ionic rare earth ore area by inductively coupled plasma atomic emission spectrometric inner standard method with ultrasonic leaching. , 2020, 40(3): 57-61.
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