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王力强, 王家松, 徐铁民, 吴良英, 曾江萍, 郑智慷, 魏双. 敞口酸溶-电感耦合等离子体发射光谱法测定海泡石中的氧化铝等主量成分[J]. 岩矿测试, 2020, 39(3): 391-397. DOI: 10.15898/j.cnki.11-2131/td.201906030079
引用本文: 王力强, 王家松, 徐铁民, 吴良英, 曾江萍, 郑智慷, 魏双. 敞口酸溶-电感耦合等离子体发射光谱法测定海泡石中的氧化铝等主量成分[J]. 岩矿测试, 2020, 39(3): 391-397. DOI: 10.15898/j.cnki.11-2131/td.201906030079
WANG Li-qiang, WANG Jia-song, XU Tie-min, WU Liang-ying, ZENG Jiang-ping, ZHENG Zhi-kang, WEI Shuang. Determination of Major Elements in Sepoilite by Inductively Coupled Plasma-Optical Emission Spectrometry with Opening Acid Dissolution[J]. Rock and Mineral Analysis, 2020, 39(3): 391-397. DOI: 10.15898/j.cnki.11-2131/td.201906030079
Citation: WANG Li-qiang, WANG Jia-song, XU Tie-min, WU Liang-ying, ZENG Jiang-ping, ZHENG Zhi-kang, WEI Shuang. Determination of Major Elements in Sepoilite by Inductively Coupled Plasma-Optical Emission Spectrometry with Opening Acid Dissolution[J]. Rock and Mineral Analysis, 2020, 39(3): 391-397. DOI: 10.15898/j.cnki.11-2131/td.201906030079

敞口酸溶-电感耦合等离子体发射光谱法测定海泡石中的氧化铝等主量成分

Determination of Major Elements in Sepoilite by Inductively Coupled Plasma-Optical Emission Spectrometry with Opening Acid Dissolution

  • 摘要: 海泡石是一种应用广泛的纤维状富镁硅酸盐黏土矿物,主要成分为硅和镁,伴有铝钾钠等杂质,测定海泡石主量成分含量对于矿物性能的综合评价具有重要意义。海泡石主量元素分析通常采用经典化学法,样品碱熔处理后使用容量法、光度法、原子吸收光谱法测定,操作繁琐,耗时长,且无法同时测定钾钠。本文建立了一种氢氟酸-硝酸-高氯酸敞口酸溶样品,ICP-OES测定海泡石中氧化铝等主量成分的方法。对氢氟酸的用量进行了优化,选择Al 396.153nm、Ti 334.940nm、K 766.490nm、Na 589.592nm、Ca 422.673nm、Mg 285.213nm、Fe 238.204nm作为分析谱线,采用轴向观测方式进行测量。由于海泡石中的镁含量较高,用ICP-OES测定时存在基体效应,通过配制系列高镁混合标准溶液以匹配基体。ICP-OES法同时测定铝钛钾钠钙镁铁各元素标准曲线线性相关系数均大于0.9990,方法检出限为0.53~3.25μg/g,测定结果的相对标准偏差(RSD,n=10)为0.66%~5.65%,各元素回收率为95.3%~108.5%。本方法采用的酸溶前处理方式较碱熔操作更加简单,测定结果与经典化学方法所得结果吻合较好,能够满足海泡石样品的分析需求。

     

    Abstract:
    BACKGROUNDSepiolite is a widely used fibrous magnesium-rich silicate clay mineral. Sepiolite is mainly composed of silicon and magnesium, with minor aluminum, potassium, sodium and other impurities. Determination of the major element of sepiolite usually adopts the classical chemical analytical method. After the alkali melting treatment, the sample is determined by volumetric method, photometry and atomic absorption spectrometry, which is inefficient and time-consuming. Moreover, potassium and sodium cannot be simultaneously determined.
    OBJECTIVESTo find an efficient method for the determination of seven major elements in sepiolite.
    METHODSThe samples were digested by hydrofluoric acid, nitric acid, and perchloric acid. Contents of major elements such as Al2O3 were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). The dosage of hydrofluoric acid was optimized. The analytical spectral lines were Al 396.153nm, Ti 334.940nm, K 766.490nm, Na 589.592nm, Ca 422.673nm, Mg 285.213nm and Fe 238.204nm, and elements were determined by axial observation. The content of magnesium in sepiolite was high, and there was a certain matrix effect during ICP-OES analysis. A series of high magnesium mixed standard solutions were prepared to match the matrix.
    RESULTSThe linear correlation coefficient of the standard curve of each element was greater than 0.9990, the detection limits of the method were 0.53-3.25μg/g, the relative standard deviations (RSD, n=10) of the measured results were 0.66%-5.65%, and the recoveries of each element were 95.3%-108.5%.
    CONCLUSIONSAcid dissolution is easy to operate compared with the alkali fusion method. The results are consistent with those obtained by classical chemical analytical methods and thus meet the analytical requirements of sepiolite samples.

     

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