Abstract：During the chemical determination of high purity graphite by traditional wet method, the sample should be treated by high temperature ashing and the procedures are relatively complicated. A series of standard samples for quantification of high purity graphite with content gradient were prepared using high purity graphite and metal ions solution. Then, they were quantified by inductively coupled plasma atomic emission spectrometry (ICP-AES), which solved the problem in lack of high purity graphite standard samples. The morphology of reagents with different carbon matrixes was compared. The high purity graphite was used as the matrix reagent of standard samples. The impurity elements in various binders were determined by ICP-AES. The stearic acid (guarantee reagent) was selected as the binder. The grinding time in experiments was 40 s. The sample was prepared by grinding-pellet method. The contents of vanadium, sodium, calcium, iron, nickel, titanium, aluminum, phosphorus, zinc, manganese,and potassium in high purity graphite materials were determined by X-ray fluorescence spectrometry (XRF). The sample was prepared using 9 g of graphite and 1.5 g of stearic acid as the binder. The precision of sample preparation method was good, and the linearity of working curve was good without correction under above conditions. The trueness of high purity graphite sample was investigated. The determination results were consistent with the theoretical values or those obtained by ICP-AES.
白万里, 张莹莹, 孙佳. X射线荧光光谱法测定高纯石墨中杂质元素[J]. 冶金分析, 2022, 42(1): 50-56.
BAI Wanli, ZHANG Yingying, SUN Jia. Determination of impurity elements in high purity graphite by X-ray fluorescence spectrometry. , 2022, 42(1): 50-56.
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