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研究了不经基体分离, 膜去溶-ICP-MS法直接测定高纯CeO2中14种痕量稀土杂质的分析方法, 讨论了Ce基体产生的多原子离子对被测元素的质谱干扰, 并且对影响多原子离子产率的因素进行了分析, 同时建立了Pr, Gd, Tb和Yb数学校正方程. 通过使用膜去溶雾化器和优化ICP-MS参数, 消除了CeH+, CeO2+和CeO2H+产生的质谱干扰, 将CeO/Ce产率降为0.008%, 同时结合数学校正方程彻底消除了CeO+, CeOH+和CeOH2+的质谱干扰. Pr, Gd, Tb和Yb的方法测定下限分别为0.08, 0.1, 0.15和0.008 μg · g-1, 14种稀土杂质方法测定下限和为0.75 μg · g-1. 99.999%高纯CeO2实际样品测定加标回收率为96%~103%, RSD为 1.2%~4.3%. 相似文献
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Cyanex272负载树脂分离-ICP-MS法测定高纯氧化钕中痕量稀土杂质 总被引:4,自引:0,他引:4
采用萃取色谱法,以Cyanex272负载树脂为固定相制成微型分离柱,以HCl为淋洗液,研究了Nd2O3基体的分离条件,分离周期为35min。建立了分离Nd后测定Tb、Dy、Ho以及内标补偿法直接测定其它稀土杂质的高纯Nd2O3中14个稀土杂质的ICP MS分析方法。方法检出限为0.03~0.30μg g,加标回收率为91.0%~110.0%,相对标准偏差为2.0%~4.9%。方法可满足快速测定99 999%Nd2O3中14个稀土杂质的要求。 相似文献
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建立了膜去溶与电感耦合等离子体质谱联用法(MD-ICP-MS)测定高纯氟化铍(BeF2)中的稀土元素,比较研究了冷雾化湿法与膜去溶干法进样技术在痕量稀土元素分析中的应用。在优化膜去溶装置参数后,MD-ICP-MS显著提高了元素的分析灵敏度,Ce的信号强度显著增加约5倍;CeO+/Ce+下降了约2个数量级,变化范围降在0.013%~0.019%之间。通过酸纯化器对本底进行了严格的控制,MD-ICP-MS的检出限范围为0.2~2.6 ng/L。对高纯BeF2进行了分析,除了含量极低的稀土元素,ICP-MS与MD-ICP-MS法测定稀土元素的相对偏差均在5%以内。MD-ICP-MS的加标回收率在92.4%~105.2%之间。该方法可为高纯BeF2中痕量稀土元素提供分析支持。 相似文献
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运用三重串联电感耦合等离子质谱(ICP-MS/MS)仪直接测定高纯Eu_2O_3中超痕量的Tm,As和Si。采用H_2的原位质量法和O_2质量转移法,有效克服了基体对待测元素的干扰。通过优化仪器参数得到Tm,As和Si的背景等效浓度分别为0.0005763,0.08435,8.268μg·L~(-1)。在选定条件下,样品加标回收率为95.74%~103.82%,相对标准偏差(RSD)为0.22%~4.38%。本方法简单实用,能够满足纯度99.999%以上的高纯Eu_2O_3中杂质元素的快速测定。 相似文献
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微型柱分离-ICP-MS法测定高纯氧化铽中14个稀土杂质元素 总被引:9,自引:0,他引:9
研究了微型柱分离 电感耦合等离子质谱法(ICP MS)测定高纯Tb4O7中痕量Lu的方法,采用Cyanex272负载树脂微型分离柱,选定了分离大量Tb4O7基体的实验条件,分离周期为40min。建立了微型柱分离Tb后测定Lu以及内标补偿法直接测定其它稀土杂质的高纯Tb4O7中14个稀土杂质元素的ICP MS分析方法。方法检出限为0.003~0.10μg g,加标回收率为86.6%~114%,相对标准偏差为1.1%~18%。方法可满足快速测定99.999%Tb4O7中14个稀土杂质元素的要求。 相似文献
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采用高纯Ga作为辅助电极,建立了直流辉光放电质谱法(dc-GDMS)测定高纯α?Al2O3颗粒中的Li、Be、Na、Mg等16种杂质元素含量的分析方法。实验考察了取样量、放电参数对基体信号强度、信号稳定性、基体和Ga的信号比值的影响。当选取3颗2 mm左右大小的α?Al2O3颗粒用Ga包裹,在1.6mA/950V的放电参数下,基体27Al信号稳定,强度为3.2×108 cps,Al、Ga的信号比约为1∶270。采用实验方法对α?Al2O3颗粒独立测定5次,相对标准偏差均在30%以内。为了验证Ga对α?Al2O3颗粒测定结果的影响,分别采用电感耦合等离子体发射光谱法(ICP-OES)和dc-GDMS法对易于消解的γ- Al2O3粉进行测定。对于dc-GDMS法,选择压在Ga上的γ- Al2O3粉直径约为4~5 mm,在同样的放电参数下,27Al的信号强度为3.0×109 cps,Al、Ga的信号比约为1∶29。γ- Al2O3粉的GDMS测定结果和ICP-OES基本一致。采用Ga做辅助电极测定α?Al2O3颗粒和γ- Al2O3粉的检出限均可达ng/g。 相似文献
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建立了用电感耦合等离子体质谱仪(ICP-MS)测定高纯氧化钽中28种痕量杂质元素的方法。讨论了质谱干扰及接口效应,采用标准加入法消除基体效应。各元素的方法检出限为0.001~0.1μg/g,回收率为90%~115%,方法适用于纯度为99.999%的高纯氧化钽中痕量杂质元素的测定。 相似文献
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Trace impurities in high-purity cadmium were determined by high-resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). To overcome some potentially problematic spectral interference, measurements were acquired in both medium and high-resolution modes. The matrix effects due to the presence of excess HCl and cadmium were evaluated. The optimum conditions for the determination were tested in this experiment and discussed. The detection limits ranged from 0.01 to 0.27 microg g-1, depending on the elements. The results for the determination of 22 trace elements in high-purity cadmium are presented. 相似文献
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A home made column of commercially available iminodiacetate resin, Muromac A-1 (50–100 mesh) was used to concentrate rare earth elements (REEs) (15 elements: Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) in seawater. An automated low pressure flow analysis method with on-line column preconcentration/inductively coupled plasma mass spectrometry (ICP-MS) is described for the determination of REEs in seawater. Sample solutions (adjusted to pH of 3.0) passed through the column. After washing the column with water, the adsorbed elements were subsequently eluted into the plasma with 0.7 M nitric acid. Calibration curves were accomplished by means of purified artificial seawater with a sample loading time of 120 s. Detection limits (DLs) of the on-line column preconcentration/ICP-MS by eight replicate operations were between 0.040 and 0.251 pg ml−1 for REEs in the artificial seawater. The precision was less than 8.9% for REEs and one sample can be processed in 7 min using a 7 ml of sample. The proposed method was applied to determine REEs in coastal seawater of Hiroshima Bay, Japan. 相似文献
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Zhang A Liu X Zhang W 《European journal of mass spectrometry (Chichester, England)》2004,10(5):589-598
Direct determinations of 13 rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb, Lu and Y) in high purity europium oxide by inductively coupled plasma mass spectrometry (ICP-MS) have been reported. The operating parameters of the instrument were optimized and the spectral interferences and the matrix effects were investigated. Using Ga or Rh as the internal standard can eliminate most of the matrix effects. The detection limits (3 sigma, n=10, integral time=1s) are 0.013-0.085 ng mL(-1) and the reproducibility (n=11) is 0.9-3%. The recoveries of spiking samples are 80-108%. Europium oxide standard material was made and its concentration values were evaluated by various techniques from 10 collaborating laboratories. By comparison of the results of ICP-MS with the results of other techniques, we have validated that ICP-MS is an accurate and reliable technique for analysis of ultratrace impurities in high purity rare earth matrix. 相似文献
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建立了微波消解-内标法-标准加入-ICP-MS法测定高纯黄金中铝、砷、铋、铬、铁、铅、锑、硒、碲、铱等痕量元素的分析方法.从试样溶解方式、内标元素及同位素的选择、仪器检测模式的优化及降低基体抑制效应等方面进行优化.实验加标回收率为99.5% ~110%,相对标准偏差(RSD)为0.050% ~6.5%.实验的准确度和精... 相似文献
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金绿宝石结构稳定,常规敞开酸溶、密闭酸溶、微波消解三种前处理方法并不能将其完全分解,测定结果偏低。本文采用碳酸钠-硼酸混合熔剂进行熔融,样品分解完全,建立了电感耦合等离子体质谱法(ICP-MS)测定金绿宝石中16种痕量稀土元素的分析方法。选择丰度高、干扰小的同位素、动能歧视碰撞池(KED)模式及干扰系数校正法消除质谱干扰,以185Re为内标元素及样品稀释降低基体干扰。实验表明:各稀土元素的校准曲线相关系数r值在0.9991~0.9998之间,方法检出限为0.0001~0.0134 μg/g,定量限为0.0005~0.0670 μg/g。采用国家标准物质GBW07151验证方法的精密度,计算出相对标准偏差(RSD, n=7)在1.3%~4.6%之间,并将此方法用于金绿宝石实际样品中稀土元素的测定,RSD为0.9%~3.2%,加标回收率为94%~104%,符合国家地质矿产行业标准,结果稳定、可靠。 相似文献
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采用封闭压力酸溶(HF+HNO3)消解样品,以Rh为内标,用电感耦合等离子体质谱测定富钴结壳中的稀土元素。用此方法对3个国家一级标准物质富钴结壳标样(GSMC-1,GSMC-2,GSMC-3)进行了多次测定,结果稀土元素的测定值与标准值相符,多次测定结果的相对标准偏差(RSD,n=5)在0.36%~4.0%之间,加标回收率为90%~106%。基于此方法,对6个富钴结壳样品进行了测定,显示富钴结壳样品中稀土元素的配分曲线与标准物质中稀土元素的配分模式一致。方法适用于富钴结壳样品的批量分析。 相似文献